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RC-Bricks hybrid car
Ryokeen posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
A bit background about the last few months of tinkering: Some might have seen that a few users, including me, experimented with small non lego/bricks brushless motors and rc parts to build either smaller cars or trophy trucks. I had my own shot on a trophy truck but sadly at that scale some problems couldn't be solved properly. One of those problems was the wheel mounting, i did use hubs with ball bearings from Zenebricks, but with just pins holding them, they would still come of at higher corner speeds. But i didn't want to give up on fusing RC components and bricks, as i love rc cars and i love building stuff. So i thought maybe even with reinforcements a live axle/multilink suspension at RC speeds and offroad just won't work as i want. That's when i thought ok, then maybe some proper on-road or rally car, best with awd or at least 4wd to get more traction and stability. At that point i only had the Zene wheelhubs with bearings and some might have read the conversation about them, they are not suited for a driven and steered axle. I tried to solve that problem but it boiled down to the fact that i needed at least one custom part, either a shortened/custom u-joint or something else. And as i knew that m3 screws fit well into pins i figured that RC parts that are mounted with m3 screws might fit the lego system aswell, so i ordered some cheap tamiya parts as those are widly available and it did fit well. That set the direction for my experiments, fusing RC wheelhups with Lego/Bricks. But wait..they can't connect to Lego axles, so i needed an adapter. I found someone who helped me with a proper cad design and specs, as some of you might have seen in the brushless post, and i ordered some parts. I got them 2 weeks ago and it all worked so well and i build a small prototype. The advantages for me were/are huge, for one, except for the custom parts every other RC part is cheap to replace, all 4 wheelhups cost less than 10€ together. I can replace worn out ballbearings in the hub(and i can clean them) for very little money and there is almost no slack at all in the stearing. Apart from that, by using toe-in/out can be adjusted, left and right wheel steering can be adjusted and the big problem was solved..RC car tires are secured with a proper nut and won't just come of that easy. Fast forward, after all that text, here are some screens: More screens here -> Bricksafe gallery That is my current prototype chassis, currently with on-road touring tires with 82mm diameter. The whole layout is roughtly oriented on most on-road RC cars, except that i choose to center the motor to move it further back and get some weight on the rear axle. Also i choose to not use geekservos even thou it complicated the steering setup but with all that traction i was worried that the geekservo wasn't strong enough. Also i need them for another project, so i put in a cheaper 15kg servo. Features: AWD Adjustable ride height Adjustable steering Adjustable toe-in/out RC shock absorbers Aluminium axles Zene metal differentials Uses common 12mm (1:10 scale) hex mounts for wheels Internal gear ratio is 7.95:1 (spur and diffs) 3250kv brushless motor on 2s (3s possible) 82mm tires And now for the magic custom part: That small part provides the connection between how RC wheels are driven and the lego system and are currently made out of aluminium. It offers a 1 stud long axle part so any axle connector can be attached, be it an common axle connector or a u-joint. The movement range is a bit more than the old lego cv's, i would say about 40 degrees, but that also depends a bit on the RC axle part. A 2mm driveshaft pin needs to be pressed through the hole at the ball end, i designed it that way cause it's easier to manufacture and the pins tend to wear out after some time, so this way i could replace them. There you can see how it's used an the mentioned driveshaft pin that needs to be pressed in. They do need some space to move that's why there is an o ring in the RC axle and a small spring that pushes the driveshaft in a bit. That was only neccessary for the front axle as there is more movement. A first testdrive showed that all the work was worth it. The prototype is fast, stable and fun to drive until a screw(metal 2l pin substitude from a uk shop) got loose cause it was the only screw where i forgot to use locktide :D Next would be more testing and deciding what kind of bodywork i want to do. From the dimensions it's based on a Subaru Impreza WRC but a Skyline should fit aswell. Think it all depends on whether i can find good 80mm rally tires or not. Feel free to ask questions and discuss and thanks for all the fish. -
Fluffy, an oversized proof of concept
Attika posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello there, it's been a while.... I wasn't entirely inactiv in the last couple of years, but I had a technical difficulty to make videos. Without videos there's no point to post anything, so there it is,a big chunk of can't do attitude... However it has changed. The subject of this topic is on an exhibition now and I was forced to overcome my lazyness and make that camera roll again. To the subject: How did I get this low? I've bought 2 sets of this Audis back in the day as I've found it being a good value for money as a partpack. As a sideproduct I had enough of the curvey panels to get physical on an old idea, the barrel like structure you see on the thumbnail above. Luckily my past granted me an unlimited supply on connectors. As long as it existed only in my head, I was quite sure it is too flimsy and fragile to bare any load, let alone to coop with the centrifugal force that comes with the rolling motion. While rolling around the empty barrel on my desk I figured I could use a somewhat symmetric structure to apply an inward tension on the barrel and that's gonna keep it from falling apart. The fact that the barrel made out of 16 panels made it kinda obvious what symmetry should I use. I put my bet on a 4 spoke solution. The barrel would give a 15.5x15.5 stud square to work with, so I've used a 15x15 structure to reach that inward tension. It is well within the reversible flex of abs, yet enough to keep the circle from pulling apart The next challenge was the attachment of the wheelhub. There is an interlocking frame that holds the sprocket wheel in the center of it.... And so to prove the concept, I had to build a whole chassis around it. For those of you who can benefit from a studio file, here it is: https://drive.google.com/file/d/1uX-avOl3x6DPfGcx_IF1nKzRtAwWqvu6/view?usp=sharing As a sidenote, the io model is a simplified version when it comes to the chaos I've built in the mid section of the frame to avoid the twisting of it. Also I took advantage on the natural flex of the connector body which could not be replicated in the rigid studio enviroment. But I can assure you, no parts were harmed. Some of the data: It is about 70 cm long and 50ish wide, has the ready to run mass of 2.7kg. Uses 4 buwizz motors to drive, a PU L motor to steer and 2 buwizz 3units to get the sparks. Originally I've built it using the slow outputs but on the 2nd testrun I had to try the fast outputs on the motors and it took it like a champ. Although it altered the driveshaft geometry slightly, it had next to no effect on the practical usage. I can't emphasise enough that this car is only a tool to prove the concept of the wheel here. To keep the buwizz units from shuting down, the max output is reduced to 92 percent. This setup gave me fun to play dinamics and a very generous 10 minute + runtime. Way more on both than what I've expected at the begining. The chassis I suppose speeks for itself, nothing out of the ordinary. The lower wishbones have a wider base towards the chassis to deal with the frontal forces. No drivetrain -no loss of efficiency on gears. One thing to mention to fellow builders: I had so much room to work with inside the wheel, when I was building the front suspension, I couldn't stop smiling how effortless to do a "proper job". Meaning caster, camber, and ackermann geometry... Nothing else really comes into my mind, but I'm sitting on this for a half a year now,so I might just be numb about otherwise important details. I'm happy to answer your further questions. Thanks for your attention and feel free to give a honest feedback. My psychiatrist prepared me for situations like this. PS: If you find the panels on the wheels looking suspicious, that's the tape I applied on them to save them from the scratches (as much as possible). -
Hello, long time lurker but never contributed anything. I been considering ideas to let my 12v trains also use the 9v/RC tracks and one of the problems was to make the 12v curved rails fit I guess other people have tried this to, but I realize by removing in total 4 stud I would get a snug fit and also a more convenient way to build track layouts. I also modified some straight tracks to be able to connect them with 12v rails switch points etc... I made as short video showing the process using cheap RC tracks and the next step would be using copper tape (and I need a extra set of 9v contact points) for the 9v system, not sure if I want to tape the 12v switch track but I guess I can test it out on a "broken" track. I thought that traction could be a problem but it seems to handle it well (test drive at the end of the video), there is some spinning when starting the train with "high" voltage but at soon as it moves it's coping quite well.
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Hello Eurobricks community! Let me introduce my latest MOC - Hummer H1 out of Lego pieces. It has approx 3800 parts, incl 7 Motors. Functions are: - Independent suspension of all wheels - 3 RC differentials like in the real model - 8 Cylinder engine - module build - easy removable hood and body. - 4 L motors for drive- Servo for steering- M motor for the winch- L Motor for diffs lock VIDEO: All photos: https://bricksafe.com/pages/Aleh/mercedes_770/hummer_instructions To start this model I was inspired of two things: 1) This video 2) Humvee from CADA Most wanted render: Building instructions are available: https://rebrickable.com/mocs/MOC-174585/OleJka/hummer-h1/#details
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WIP On-Road to Off-Road Chassis conversion
CrazyKreations posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hey everyone, I stripped down my Dodge Demon MOC to the chassis and I want to modify it in a way that will make it look more rugged and potentially even have some RC components added! Do you all have any suggestions that you could please give to support the build?????? Here is a before and after of the chassis as of today: The Changes I have made are the following: - Improved central ground clearance - Components of the chassis have been removed to allow the fitment of bigger tyres - Larger Tires - Some reinforcement of the suspension struts and how they connect to the chassis I have a workbench post on rebrickable with a video! https://rebrickable.com/users/CrazyKreations/workbench/6109/ What should I add or change next????? -
[MOC] PiPi - small 4WD Drift car
Krxlion posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi everyone! Not so long ago, I presented a WIP project I was working on, a 2WD Drift car. So the question is, why am I showing you this model. Actually, the best answer would be that I gave up too fast on the previous one and immediately move to the smaller scale. During building this model, I came to the realization that the problem with drifting in the previous car was not with tires (although suited drift wheels are much better), but with the floor I was testing it on. From that moment on, I was testing the model in a different place, where the floor is made out of wooden panels. Features Locked 4WD with different speeds on axles(front 1:1, rear 1:1666) Positive caster angle Working front and rear lights suited for Lego Regular Lego 49.5 mm wheels (15413+56145) Opening trunk Powered by RC setup (with gyro function - helps counter-steer) Design After the first failed attempt to build a drift car fully out of Lego bricks, I still wanted to use rubber tires and achieve my goals. In the time I was starting to build the model, there were at least two similar cars posted, which reminded me about @Anto Hoonicorn MOC. I wanted to preserve his idea of front axle in my MOC and enhance my model by giving its rear axle faster rotation speed, thus making it slip faster. The source of power still remained in A2212 BL motor, in the drivetrain you can see that it was geared down by planetary wheel hub. Model is steered by geek-servo directly connected to the axle, which controls the steering rack. Legend (explanation on stud.io bricks presented in the picture above) 4x yellow stacked 28-tooth gears are in fact a A2212 motor Grey bricks shaped in 5x3x3 are in fact a geek-servo More renders and pictures below Non-Lego parts usage RC setup (DumboRC X6FG, 35 ESC SurpassHobby, SOARIN2 S 1300mAh 7.4V 30C, A2212 1000kv brushless motor, geek-servo, Lucas Oil for lubrication) 1x metal U-joint 4x 1x3 trans-red plates from CADA Finally, I got a short video presenting the model Mass 770g Dimensions 30 x 15.2 x 12.1 cm Scale 1:12.5 GALLERY -
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[WIP] Red Wolf - 4WD RC Buggy /w Buwizz
Didumos69 posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi, It's been a while, but this winter I got my hands on the Audi RS Q e-tron set with the new wheel hubs for the strong (RC-capable) CV-joints. A year ago I got 2 Buwizz 3 units and a couple of Buwizz motors (their buggy motor remake) and with the hubs and diffs from the Audi I could finally continue a concept that I have working on every now and then over the past few winters. The idea was to create an off-roader with ruggedness and capabilities comparable to my Greyhound 4WD RC Buggy and Make a modular build with an easily removable body, just like with real RC cars Make the Buwizzes easily removable, so you can use them for multiple models Make it easy to reconnect the steering ball joints if impact caused them to detach The wheelbase is 3 studs shorter and the trackwidth 2 studs narrower compared to the Greyhound. The roof top is also 2 studs lower. All in all I strived for a little bit more of a race look. One of the ideas that I started with (about 2 years back), was a setup with 9L steering links that are positioned with a small angle, such that they are actually a little too short (about 0.8%), which gives them a nicely tight fit; when you use them at both the front and rear side of the steering setup that is. With this setup any rotation in one wheel hub translates to immediate rotation of the other wheel hub, without any slack. I also wanted to use 4 Buwizz motors to make the whole thing capable. At a certain stage I had a setup with the old wheel hubs and the new RC-capable CV joints, but I could only make that work for a RWD model, not for 4WD. 4 Buwizz motors on a single axle did not turn out to be a good idea. With melting axles and frames as a result. With the new wheel hubs of the Audi RS Q e-tron I could revert to 4WD and I could finally make the whole thing work. Here's a video of the first successful test-drive with the chassis only. -
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[MOC] 1970s rc rally car
Aurorasaurus posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Inspired primarily by the Opel Manta 400, I've made my own RWD rally car. It features independent front suspension, and a rear live axle using the big ball joint and a metal U-Joint. Its propelled by 4 buwizz motors and steered by one C+ L motor. Some late WIP photos Earlier WIP photos Problems Because of the narrow wheelbase and relatively high center of mass due to high up buwizz units, the model easily rolls when driving at high speed and cornering. I was lazy with the design of the suspension; the front is too soft and the steering is inaccurate because I am using Instead of the newer parts with longer arms for steering links. This allowed me to fit the wheels inside the body, though. The rear suspension is too hard primarily because I got lazy and wanted it done, after about 8 hours on the model I was getting bored. The bodywork has some parts that could be white if I had the parts in white, but those parts are quite small. If you have any questions, feel free to ask. As of right now I still have the model assembled. Thank you for reading. -
[WIP] 2WD Drift car with pop-up headlights
Krxlion posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello and welcome in 2024! Today after quite a break (due to moving to a new house) I present you... Well, it does not have a name yet. Although it is kinda based on real car - Ford Probe II (which I own myself). The idea was to create a version of mentioned real car, but with rear wheels drive so it would be able to drift. After some time spent in the building process I convinced myself that I will simply go with the flow regarding body and just slightly base on Ford Probe II. Features Locked 2WD (rear wheels) Double-wishbone suspension Camber (provide less tire contact with the surface and helps drifting) V6 fake engine Regular Lego 56mm wheels (56908+41897) Manual pop-up headlights Powered by RC setup (with gyro function - helps counter-steer) Design The initial idea was to create a car in roughly 1:12 / 1:10 scale that is able to drift with rubber tires. To help achieving this I immediately knew that I need a camber in the car (this section was heavily inspired by plastic gear YT channel). For differential I went with an old 28-tooth one, because this is the only one (I believe) that can be locked. I also wanted to finally have fake V6 engine in my MOC, so by placing another 20-tooth gear in the back of the frame it not only helped transfer rotation to V6 section, but also secured differential, so it cannot skip gears. Source of power comes from A2212 BL motor, it is then transfered to Lego system using slight modification in its shaft (I explained this topic a little bit in one of my previous posts. If you want me to elaborate it deeply, please let me know :). I then gained torque but decreased speed using 46490 wheel hub as transmission. The steering is done by geek-servo, although I have a problem with those, because in fact they are not fully rotating +90/-90 degree, so I needed to put 20-tooth gear first and follow it by 12-tooth so it rotates slightly more than +/- 90 degrees. This solution provides a massive steering angle, which cost me giving up on regular wheel panel arches. So does it drift, that is the question. Answer is yes and no, what I mean by that is that without a body it does have a perfect 50/50 front/rear balance and tuning the gyro helps even further with drifting. I recently started to work on a body and sometimes I do test-drives and I can see heavy impact of that extra bricks. With the body now placed mainly in the front of the car it is a lot harder to handle and it mostly spins like most of lego "drift" cars. We will need to wait for final results after I finish the whole body and tweak everything. The video will be for sure, but not yet (need to learn properly how to drive it and build body ). Time for some renders and pictures Legend (explanation on stud.io bricks presented in the topic) 4x yellow stacked 28-tooth gears are in fact a A2212 motor Red bricks shaped in 5x3x3 are in fact a geek-servo Gloss 11x3 panels with some other bricks that are in two 5x7 technic frames are in fact a battery Front axle close-up Rear axle close-up Built MOC Partly finished body Non-Lego parts usage RC setup (DumboRC X6FG, 35 ESC SurpassHobby, GensAce LiPo 1800mah 11.1V, A2212 1000kv brushless motor, geek-servo, Lucas Oil for lubrication) 2x 3L axle cut to 2,5L (used in driveshaft in each wheel, because of non-standard length) 2x half bush cut in half, so it is 0.25 stud long (used in driveshaft in each wheel, because of non-standard length) 2x metal U-joints Mass (without body) 706g Dimensions (without body) 21.3 x 33.6 x 8.5 cm Scale around 1:11 Gallery -
Another 4WD Drift Chassis Project
FriedlS posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Here is my new 4WD Chassis for drifting. At least it is a modification of my previous chassis and it works really good. Propulsion: Monster Motor 1:1 gearing Steering: Servo with positive caster MK Battery Weight: ca. 300g and a short clip of driving: Hope you enjoy it 😊 greetings, Friedl -
DMC-12 Back to the Future
Ryokeen posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello everyone, As i'm kinda done with the exterior, cable management and stuck with the interior progress i'll just show what i got after around 4 months of work. I admit i took some inspiration from a moc on rebrickable from Mr.Platinum. I bought his instructions and asked if i could use some smaller parts like the idea how he did the back light so that's fine. It all started when i was a kid, watching that movie, loving the car and having lego :D and now that i'm older, the parts exists and i have the money i thought, yea let's build a DMC time machine. After gathering reference material and starting on a digital model my goals where set. Make it rc 4 speed gearbox Some light effects realistic interior Gullwing doors Hiding the electronic components Steering wheel should turn Possible leave it without motors as a display model So far i've more or less hit all my goals. Functional satisfied, aesthetically...to many cables. Since i wanted to maybe drive it a bit: Gearbox and lighting is remote controlled Lighting has 4 modes, off, only head/backlights, BTTF lights and both on. Ackermann steering geometry Independent suspension front and read The rc components components are similar to my tropy truck, but here i use a 540 80t brushed motor and 2 geek servos. One for steering, one for the gearbox. Full bircksafe gallery: DMC-12 First i started with building a normal stock DMC-12 so see if everything will fit and to make sure the base body looks good. Also i wasn't sure how to do the planned light effects back then. I tried to somehow mimic the layout of the original car and managed to place the motor above the rear axle. Sadly because gearboxes with lego parts are kinda clumsy i had to place that somewhere else. I thought about a few gearboxes but then just went for a linear layout hidden in the area between the seats. That also gave me space behind the seats to hide the esc, cables and the receiver. Also it served well as a reinforcement for the whole chassis as cars with gullwing doors have a problem to use the roof for stability, at least lego build ones. The real challenge started with the bodywork, especially the hood area, the doors, and the side area around the doors. I first tried to use panels but i didn't like how they were curved and the angles they gave me, also the bigger light blueish grey panels are quite expensive. So i made a rather complex structure to mimic the curvature from top to bottom and the front/back steep angles of the doors. From the shape itself i'm satisfied even though it's not as watertight as some other areas and resulted in quite heavy doors. That's also the reason why they lack a inner covering. But the gullwing doors are stable and with the help of some old lego dampeners(the transparent ones) they stay close and open smooth. The dampeners are placed left and right behind the back wheel arches. Making a time machine out of a Delorean Apart from all the sifi stuff in the back portion of the car a truly important feature, at least for me, was a lit flux capacitor and the blue light around the car during a time jump. The interior is still not fully finished, since i can't decide whether to go more in a modelling direction or just vaguely hint stuff. Flux Capacitor As i could not 3D print anything it was quite a challenge to make one that looks good enough and is actually lit. EL-Wires where one candidate but for that i would have needed a seperate inverter and those are not small nor quiet. So i went for optical fibres, similar to the old lego ones, some drilled holes and some glue. The fibres used are 1.5mm thick. Also i tried to make it like i saw it in the movie, a box with the recognisable Y shape stuff in it, shielded by glass. For the bluer parts of the lighting, when a timetravel happens, i use 3mm thick fibres which again fit nicly through pins so i could secure them well. The good thing for 3rd party parts here is, i could order them in 2m size so i didn't have to use put 2 24l lego fibres end to end and hope the light will transmitt well. 3rd party optical fibres are also way cheaper. I would like to have some cover to simulate the metal nature of those double lines, but no chance except i would 3D print or use modelling plastic sheets. But the cables for the led added to the realistic look as i could mount them where the original car had cables aswell. And of course the needed headlights for some night time driving. Simple 5mm leds fitted into pinholes. So far it was nice to combine all those techs to create something i wanted to build since i was a kid. And even if i need some of the metal parts or the servos and motors, i think i'll just keep it as a display model with lights Feel free to ask questions and have a great day. -
Eagle V2 an RC Trophy Truck [MOC]
Daniel-99 posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello, EuroBrickers! I am pleased to present to you the second version of my RC Lego Trophy Truck EAGLE. To be more specific, this is the third deep modification of the second chassis. Not surprising, as I've been working on this project for over three months now. For a better understanding of this topic it is worth reading about the first version. A better quality photos could be found on my BrickSafe. And a video: First looks: Features Independed suspension at the front with positive caster angle. 4-link solid axle suspension at the rear with anti-roll bar RC shocks (80 mm at the front and 110 mm at the rear) Brushless motor A2212 1200 kv for propulsion, Geek Servo for steering, 1500 mAh 3S Li-Po for power Strong and efficient transmission with metal U-joints and metal bearings. 95 mm RC wheels Light-weight bodywork Main goals "It's never a good idea to stop if you have something to improve." With these thoughts I was preparing a post about my Eagle a month ago. Here's a list of things I wanted to improve: Weight distribution: the heavy electronic components located in the cab loaded the front suspension more than the rear suspension. Rear axle geometry: due to triangulation on the rear axle, the driveshaft and lower suspension arms were located very high off the bottom of the truck, which limited the maximum compression angle of the rear suspension, and the entire chassis was not set to the horizon. Rear suspension setup: a true trophy truck requires a suspension with progressive stiffness. Front axle: steering was very sensitive, rather unusual front triangle shape and tilted lower suspension arms. Overall bulkiness of the chassis. Electronics The Eagle V2 utilizes the same electronic components as the Eagle V1. The story of my choice of such components is given in the post about Eagle V1. Therefore, I will be brief here. Motor: A2212 1200 kv Battery: 3S Li-Po 65C (30C is more than enough) 1500 mAh Controller: 2-3S 35A Transmitter: FlySky FS-GT5 Pros: Brushless motors last longer than brushed motors. High speed and torque in a compact size (about 3 BM in an XL motor) Radio control (best for fast RC cars) Cheap components (compared to Lego electronic components) available at local RC stores. External Li-Po battery allows for different layouts and unlimited power flow. Cons: Requires advanced techniques to build strong transmissions (requires lubrication) Otherwise can easily damage plastic parts. Not an easy decision for purists. Difficult to share instructions with others. Have to take care of tangling wires (same goes for large Lego-is designs). Non-universal solution, suitable mainly for RC Lego machines without a list of additional features. Frame & layout The Eagle V2 has a new "tube frame" (or chassis). This is why I decided not to call it a modification of my Eagle. Let's take a look at it from front to back. All important terms in this section are marked with bold text. In addition, this terms are highlighted on pictures. The front triangle uses the same "almost right" triangle with 14,15 and 6 stud lengths as the Eagle V1. The lower tube of the front triangle is made of two flip-flop beams that have been stacked together. This solution provides a sufficient level of stiffness and resistance to torsion. In addition, I was able to bring the suspension arm mounting points as close to the center as possible. The lower tube of the front triangle is adjacent to the flat bottom made of panels. The upper tubes of the front triangle intersect with the front wall. Further they pass into the side tubes of the cockpit. These tubes are made with flip-flop beams, which allowed me to secure them in place with a 15L front cross-brace (the Eagle V1 cockpit was 2 studs thinner). It's worth noting that the GeekServo motor squeezed perfectly between the lower front triangle tube and the cross-brace of the front wall. Thus, it practically reinforces the front triangle. The cockpit ends at the rear wall, which is reinforced by a rear triangle and structure around the transfer case housing. The side tubes pass into the rear H-tubes (horizontal). At the same time, the rectangular rear triangle is mirrored to form another rectangular triangle at the very back of the truck. The cross-brace on the rear wall is made using L-beams and 3D printed motor housing. Now let me describe the layout of the electronic components. Using a custom transfer case housing, I was able to move the brushless motor out of the cab. It is now located directly behind the rear wall. More importantly, I was able to move the Li-Po battery out of the cab. It is now located above the motor. It is true that this solution increases the center of gravity, but on the other hand it provides excellent weight distribution, which is very important for a trophy truck. The controller is located in the cab next to the driver's seat. Both battery and controller have no pin-holes, but I was able to fix them in place quite greatly. To load the rear axle even further, I added the spare wheel. Bodywork My main goals with bodywork of Eagle V2 were the following: keep it light keep the original shapes of Eagle V1 improve the proportions As a result I made the whole truck one stud longer and two studs wider than the first version. Now cockpit is wide enough to fit the driver`s seat. Also I changed the bonnet and the front grill. Finally I changed the very back of the truck to make it closer to real prototypes. I have to add, that not only the bodywork make the car look good. More importantly to keep the proportions in the chassis. The authentic look of the Eagle V2 is achieved with the proper settings of the suspension. Transmission I'd like to make a 3D model of my truck and show you a nice rendering of the drivetrain, like some great technical builders do. However, the Eagle V2 has a lot of custom parts and a bunch of "illegal" techniques like "almost rectangular" triangles. So I will just mark out the transmission components: Brushless motor with custom housing with planetary gear inside (1:4 gear ratio) Central transfer case with 28:20 gear ratio Rear differential with 12:28 gear ratio The transmission is built on carbon fiber axles and metal U-joints. It is separated from the frame by metal bearings. Metal bearings are used in the center transfer case, in the 5x7 frame that holds the differential, and in all the wheel hubs. I also lubed the planetary gear inside the engine case. Suspension geometry As I've said before, trophy trucks are all about suspension. So the main reason I did a V2 of my Eagle is to try and improve the suspension (both front and rear). Front suspension: Truth be told, not all custom parts turn out to be universal. On the contrary, the idea of efficiency in certain places and the idea of universality are not compatible at all. The Eagle V1 front wheel hubs are a prime example of this principle. They were originally designed for IFS street cars with smaller wheels. Therefore the basic ideas are present in their geometry: An inverted ball joint for the lower suspension arm (which is great in general). Combined with the tilted front suspension, they looked nothing like real trucks. The steering arms were 0.5 studs long, which resulted in very sensitive steering. I also didn't really like the 8 stud length suspension arms, which required custom of steering links to work properly. So I designed a new front suspension system that includes: 9 stud length suspension arms. New hubs (originally designed for live-axles) with 1 stud length steering arms. Thus hub does not use the ball joints! The new design is a deep modification of the Falcon trophy truck front suspension, which has proven to be reliable. In the V1, I used 8-studs suspension arms to fit within a certain chassis width and maintain a strong lower tube of the front triangle. However, by using stacked flip-flop beams, I was able to keep it 1 stud wide without losing stiffness. Rear suspension: It won't surprise you that the Eagle V2 has a new rear suspension. Here's a list of the changes: A new rear axle has been designed (again with a different set of custom hubs). It's more compact than the one the V1 had. The upper triangle of the suspension arms has been inverted (to match the real-world examples). New lower arms have been build. Now the live-axle was given the necessary degree of freedom. The attachment points for the suspension arms were lowered by two studs. This modification was possible due to the changes in the drivetrain described above. The anti-roll bar has been redesigned to match real prototypes. It resists to the twisting effect of the rear axle that appear in the acceleration. Shocks "Once a perfect suspension geometry is achieved, one may look for a proper set of shocks springs" The best springs Lego ever made are the hard 9.5 L springs, because they have a good amount of travel and responsiveness. For example, the 9.5 L soft shocks are not as good because the spring force has a hard time overcoming internal friction. On contrary, the 7L hard shocks have little travel and not enough stiffness to work properly with the hard springs. So I used 9.5L hard springs in the Eagle V1 and early versions of the second chassis. I tried to build a progressive rear suspension using Lego springs, but was not successful. The resulting design was either too unreliable or too bulky. I guess I lacked luck and skill, but I couldn't build a suspension that was both soft and shock resistant. It was either too stiff to absorb big bumps or too soft. So I decided to use RC shock absorbers to properly address this issue. RC shock absorbers have different springs that allow you to adjust SAG and progression without having to move the shock absorber mounting point along the suspension arm. I once tried to adapt RC shock absorbers to Lego, but couldn't find a suitable way to attach them to the Lego pins. Fortunately, a working solution was offered by Ryokeen in his Generic Brushless Trophy Truck. I again had to modify the chassis to fit 1:10 scale RC shock absorbers. Front suspension has 80 mm shocks with 2.5 studs travel. I mounted it behind the suspension arms as it is done it real Trophy Trucks and many RC scale models. There was a way to place it through the upper A-arm, but such solution required 4L liftarms. In addition it had not freedom in the choice of mounting points. Rear suspension uses 110 mm shocks with approximately 3 studs of travel. Additionally they have a dual spring setup, which give the desirable progressive hardness to the rear suspension. Again, I tried to mount rear shocks in the same way it is done in real Trophy Trucks. Developers diary. 3-7 Sep An Eagle V1 was finished. The driving tests started. Front wheel hubs are the same as in Hornet 4x4 Buggy. 11-15 Sep The new front triangle has been built. Now truck has a tilted lower tube and positive caster. The differential has been changed from yellow to red one. 17 Oct I stated developing a new chassis with a different set of ideas behind. (mostly with the triangulation in the rear axle removed and central transfer case added). 24 Oct First prototype of the new chassis has been built. In addition to the redesigned rear axle, I made a new front axle with a shock coming through the upper A-pillar. 27 Oct I started building a bodywork for a new chassis. 1 Nov The first modification of the second version of Eagle has been finished. I started the driving tests. The rear suspension has a new idea if mixing anti-roll bar with additional shocks to achieve progressive suspension hardness.... that was a total madness... 8 Nov The whole chassis has been widened by 2 studs for better proportions. 14 Nov A new rear suspension ideas has been applied. The back of the Truck has been changed. Now the rear suspension has two sets of hard 9.5L springs on each side. Progressive stiffness... Bulky realisation. 25-28 Nov RC shocks has been added. For that reason both front and triangles has been redesigned. -
[MOC] RC Telehandler
legomarat posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
After several years I am back! My latest MOC is Lego telehandler based on CAT TL642. Since it is not an exact reproduction I decided to change name and logos. Buwizz and iPad are used to control it remotely. There are four motorized functions: drive with PF L motor, boom elevation with PF L motor, fork tilt with M motor, and steering with PF servo. Front wheels are driven through a differential, and the rear axle has a simple suspension. Overall, it is maneuverable, easy to operate thanks to the proportional control of Buwizz, and very fun to play with. Please check out my flickr and https://www.flickr.com/photos/marat_andreev/ my instagram www.instagram.com/legomarat/ Interior controls are made with stickers Also I found a nice reflective sticky paper to make mirrors -
Flat baja-truck II (or Arctic first-responder)
Lixander posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
I had an idea of making a small baja-truck for some while and with the Artic vehicle contest it was a perfect match. Here is the concept, made in a Studio file. So, the ”functions” are those of a normal RC car - detachable body, steering and forward/ reverse. For this, the model has 1x servo-motor and 2x buggy motors; with 1x battery hub, it should weight around 800 g or about 28.21 oz. I still didnt found a secure way to attach the battery hubs in the back but I am already thinking of making frames only for BuWizz 2.0 and the MouldKing 4.0 hub, because BuWizz 3.0 has a greater chance of hitting the motors and takes more space too. Also, the suspension travel is pretty big in the front and in the back too, although I have reduced the travel for the front arms because of the over-steer. Here is the almost finished front of the original variant of the model, which had a big over-steer issue. I had to modify the motor frame too. The first 2 images are the concept version and the 3rd image is the last variant, with longer liftarms that allow the suspension to work (you can see the swapped 5L liftarms and the soft springs, which were too soft, obviously). I dont like the current body-work, so the amin thing on the ”to do list” for the Ice baja is to modify the body-work as much as it is possible. Anyway.............in 2 days I kind of managed to finish the chassis. As I only have one buggy motor ”functional” (is partially burned too), I cant test it properly, but I will see what I can do; until then, I am pretty pleased with result of the chassis. More photos will follow with the progress of the new body-work at least, but if I find something to improve on the chassis, then it will be with the chassis too. (The tires in the last 2 photos will be replaced with official Lego ones in the next photos; also, those tires are messy, so sorry for all of that :/ ) -
Hello All!! I'm very happy to share my latest Technic supercar design, the BMW M4 GT3! I spent the entire summer working on the chassis, trying to make use of the new Ferrari Daytona parts (rims, differential, panels) to create a fast RC design with full turning capability and full speed. My latest design, the 1:7.5 BMW M4 GT3! by lachlan cameron, on Flickr This build features 5 different suspension ride heights, 3 of which have torsion bar suspension, full RC drive and steering with working steering wheel and lights, manual option with HOG, door locks, opening hood truck and doors, inline 6 engine. BMW M4 GT3 by lachlan cameron, on Flickr I wanted the suspension to have an easily adjusted height, something that can be switched on the fly, and to be able to create a racecar stance, lower at the front and taller at the rear, all while being fully functional in RC mode for each height. My latest design, the 1:7.5 BMW M4 GT3! by lachlan cameron, on Flickr The new differential allows minimal friction, allowing this car to hit a very comfortable speed with 1 buwizz and 2 buggy motors. The steering is very nimble with full turn capability, and even more so with Andrea's brand new design - custom create rims that actually remove the brake disk from Lego and use his own designed hubs to sink the deep disk rim inward, while still providing functionality to the RC drivability thru the u-joints. My latest design, the 1:7.5 BMW M4 GT3! by lachlan cameron, on Flickr @snakeeyes_friex designed the livery, this man can design without boundaries. Honored he could help with this model and all the hard work. Thats all for now... more photos to come! Enjoy! My latest design, the 1:7.5 BMW M4 GT3! by lachlan cameron, on Flickr My latest design, the 1:7.5 BMW M4 GT3! by lachlan cameron, on Flickr Motor options - Buwizz 2.0 or 3.0, old motors / new motors by lachlan cameron, on Flickr My latest design, the 1:7.5 BMW M4 GT3! by lachlan cameron, on Flickr My latest design, the 1:7.5 BMW M4 GT3! by lachlan cameron, on Flickr My latest design, the 1:7.5 BMW M4 GT3! by lachlan cameron, on Flickr
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[MOC] Dune Buggy RC - 8284 Redesigned
cyberdyne systems posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Good day/night/whatever everyone! I want to share with you a little experiment of mine that got a bit out of control. I hope, you remember set 8284 and its really unique looking b-model. At least I do. Furthermore, it is one of my favourite b-models and I really wanted to pay tribute to it. Obviuos thought was, of course, to make it RC with the new Control+ elements. After half an hour I got something that could drive and steer. I even tested it in the local park, but... something was off. It just wasn't enough. However good looking this buggy is, its transmission wasn't created with electromotors and speedy driving in mind. Wheels tended to fall off. Gears in diff broke at least once. And offroading capabilities were...em... on the small side of expectations. And I got an idea! I decided not just to motorize this buggy, but completely redesign, reimagine it from technical point of view, keeping exterior close enough to what it was before. You know, like these like-oldtimer-outside-but-modern-inside tribute cars which car companies sometimes make. Also I wanted to make transformation function more interesting and useful. So, I started on the blueprints... And here it is! All modern all new Dune Buggy! With familiar face which got a facelift. Literally. New version of transformation not just shortens the car, but lifts all front section up While cockpit raises up, special levers make sure that headlights between wheels always stay horizontal. And not only that. Another special lever in the rear section locks the differential using new orange shifter. This way buggy becomes most offroad. And now - to the video! (With the new intro btw) -
[MOC] EAGLE an RC Trophy Truck
Daniel-99 posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hey, guys! After a 3-month brake from Lego, I am glad to show you my new RC trophy truck, called Eagle. I apologise for the quality of photos and I will try to improve them later after I will get myself a studio light. I will also make a proper introductory video when I will get enough outdoor footage. Features Responsive long-travel suspension with 4-link live-axle at the rear and double wishbone at the front Brushless motor A2212 1200 kv for propulsion, Geek Servo for steering, 1500 mAh 3S Li-Po for power Strong and efficient transmission with metal U-joints and metal bearings. Great ground clearance for outdoor use, 95 mm RC wheels Light-weight bodywork Experience and Inspiration I guess that nobody will be surprised If I would make a confession that I have a deep passion for Trophy trucks. This type of vehicle suits the best for the role of a fast RC Lego cars which are build for outdoors. Indeed, outdoor environment is always rough and "bumpy" for Lego cars. I took my inspiration and first experience form several well-known Lego builders, such as: Sariel RM8 ZeroBricks GooberReboot Through the last 3 years of intensive engineering I made a few attempts in building myself a "proper" trophy truck. Each of them had it`s own features and technical problems: Heavy-duty Trophy Truck: RWD, 2x BM, 2x Buwizz 3.0 units, 95mm wheels. Problems: "big scale" which caused a serious load for motors, over-tilted front caster. Phantom: RWD, 2x BM, Leshy control unit, 85mm wheels, mid scale. Problems: lack of power from Leshy unit, lack of articulation at the rear, plastic wearing in the wheel hubs. Wilde Beast: 4WD, 4x BM, Wixy RC control + 3S Lipo, 95mm wheels. Problems: "big scale" which caused a serious load for motors, indep. susp. with a questionable geometry. Falcon: 4WD, 4x BM, Wixy RC control + 3S Lipo, 75mm wheels. Problems: indep. susp. with a questionable geometry, overheating of motors at the maximal RPM. About a year ago I switched from Lego Buggy motors to a Brushless motor (for the reasons which will be covered later). This was not an easy switch for me and I had to learn some RC electronics theory and find the proper ways of using brushless motors with Lego. My latest RC cars with Brushless motors was: Unimog trial truck Pathfinder SUV Hornet 4x4 buggy With pathfinder and Unimog projects I studied the 4-link live-axle suspension geometry, while with Hornet project I found the way to achieve a proper suspension and steering geometry with my custom wheel hubs. With this projects completed I get myself all cars I need. - What should I build next? With such question in mind, I faced a deep burnout from Lego, so I decided to take a summer brake. Hot summer days returned me my passion for Lego, and I had a plenty of time to plan a new project. I felt myself ready to make another attempt in building myself a "proper" trophy truck. That is how the story begins. Electronics With my latest truck Falcon I reached the limit of what Buwizz motors could handle. Some time ago there was a discussion about efficiency and power-to-weight ratio. I would not resist that with the growing number of motors and Buwizz units, one could get a better power-to-weight ratio, though such a way faces the problem of plastic-weariness quite soon. With the growth of the number of motors, also grows the size of the car and it`s total weight, which get distributed to the four Lego plastic wheel hubs! I faced the plastic-weariness problem of Lego hubs with my Phantom truck, and solved it by purchasing custom wheel hubs with metal bearings, which I were used in the Falcon truck. Moreover, there was no gearing in the transmission of the Falcon truck: each wheel was connected to it`s own motor via driveshaft with metal bearings. With 4x Buwizz motors on board, powered by strong 3S Li-Po battery, Falcon had a great power-to-weight ratio. Through multiple tests I found that It can not handle full throttle for more than 45 seconds due to the rear motor overheating. It was pretty clear to me that RC Li-Po could easily overfeed 8 or even 12 motors with power, so there was no sense in adding more BM motors. Likely to me, one Russian AFOL developed a 3D-printed housing for Brushless A2212 motor which allowed to use it with Lego. I purchased two sets from him, and mot I have 100% RC setup. There was no problem with the lack of power or motor overheating anymore, but it was a real challenge for me to overcome this energy! Transmission With BM motors it is very natural to distribute the torque among axles \ wheels, by having separate transmissions to each axle \ wheel. But with Brushless motor I had to use "realistic" transmission, since there is only one output with a plenty of speed and torque. Despite the fact this motor is a baby-motor in the world of RC cars, It has enough power to twist Lego axles with instant reaction to the throttle. Custom 3D-printed housing has a 4:1 planetary reduction, but the speed of the output is enough to cause gear-melting. That is why the following decisions were made: use metal U-joints all around, most of them have a 3L lego axle glued from one side to prevent them from falling off. use silicone grease to lubricate the planetary gear in the motor housing and some external gearings. use custom parts with metal bearings to separate the transmission from the car frame. use carbon-fiber axles in the central driveshafts. The new Eagle truck has a very simple RWD transmission with a single "external" 14:23 gearing in the differential. Recall, that the 3D-printed motor housing has a 4:1 gear reduction. So the motor is connected to the differential via carbon-fiber driveshaft. From the differential power translates to the 95 mm RC wheels via half-axles with metal U-joints. The whole transmission sit on the metal bearings (custom wheel hubs with metal bearings, custom 5x7 frame with metal bearings for differential housing, motor output passes through the connector with the metal bearing). Surely you have noticed that I lifted the central differential by one stud over the wheel axle in order to achieve a higher ground clearance! Which differential to use RED or YELLOW? RED differential has a 28:12 reduction which reduces the load from the driveshaft and the motor. Moreover, such gear ratio is more realistic. On the other hand, YELLOW differential has bigger teeth so it is stronger. But more importantly, is that YELLOW differential is 125% more efficient than the RED one, since it has bigger gears and does not scratch the 5x7 frame under the load. In fact, I am using a custom torsen differential with 23-tooth gear. It also does not scratch the 5x7 frame and hold half-axles much stronger than the original YELLOW diff. Suspension Trophy truck is all about suspension, and it was the most challenging part for me! Non of my previous trophy trucks has a proper suspension: it was either rear live-axle without articulation (Phantom, heavy-duty trophy truck) or independed rear suspension (Wilde Beast, Falcon). As I found from multiple driving tests of Phantom, rear axle need an articulation, cause otherwise RWD car loose the speed on bumps. IRS give the desired articulation and stability, moreover it is very simple to build and it has a low unsprung mass. Despite that IRS has a limited articulation and it is not presented in real Trophy Trucks either! Lego engineers designed a ball-joint connection, which is used in many Trophy trucks. It gives a single-lever suspension (with it`s simplicity and stiffness) and desirable articulation. Well, I did not use it, since it has no metal bearings for the U-joint inside the ball. So I had to replicate the 4-link live axle. 12-long reinforced suspension arms, invested upper triangle, 9.5 L springs, attached to the mid of lower suspension arms, Anti row-bar with a carbon-fiber axle, Now let`s move the the front suspension. Surely, real Trophy Truck has a complex front suspension, which is impossible to replicate with lego bricks. Though lego-ish version share important principles with real prototypes: double wishbone with 8L suspension arms (9L was too wide here) Positive caster angle Reinforced lower arms Shock is attached to the lower arm closer to the center of the car Steering rack is located in the front of the car Again I use custom wheel hubs with metal bearings. They have an inverted lower arm mounting point, though it is possible to use Lego hubs instead. With hart 9.5 L springs the front suspension has a long travel, moreover it has a great balance btw softness and responsiveness + side-way support. Bodywork & Frame In order to achieve a positive caster angle I tilted the lower part of the frame. At the same time, the upper part of the frame. At the very front of the car upper and lower parts of the frame meets together which form the "almost right-angle" triangle with lengths: 13+1, 14+1 and 5+1. (right-angle triangle has the following lengths: 12+1, 13+1 and 5+1). Second time I use the Pythagoras theorem to make a force triangle for the rear springs attachment points. I tried to keep the frame of the truck in 13-15 studs wide, to use 15L liftarms for cross braces. I was Luckily to me I was able to squeeze all electronics into cockpit. This give the model 50:50 weight distribution and a "low" (for such high car) gravity center. Well, one would prefer to obtain 35:65 weight distribution for the RWD truck, but It would raise the gravity center and would require extra structure over the rear axle. The whole bodywork consist of 24 panels and a few bricks, so it does not cause much weight to the truck. -
Remote Controlled Tower Crane - MOC
Timorzelorzworz posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello everyone, this model of a Tower Crane is made only with 1166 pieces and controlled with either smart device or physical remote. In order to all functions of that model, you get a complete overview in this article how to build and how to control this crane. You can find instructions here if you're interested in building this model. Summary of Functions & Features remote controlled with PoweredUp 2-way-gearbox to select between functions motorized hook, trolley and 360° crane rotation Hub with batteries as counterweight modular building with extendable tower Minifigure scale to fit City layouts openable cabin 83cm superstructure length 70cm tower height Impressions Electronic components The crane uses the newest PoweredUp electronics to power all the functions. In order to remotely control this model, a physical remote pad is not mandatory because the crane is also controllable with optional smart device and PoweredUp app. Shaped with some system pieces, the PoweredUp 2-port hub with batteries included fits perfectly as counterweight and is easily replaceable. Simply turn on the hub by finger press and connect them to either PoweredUp app or physical remote to let the fun begin. The official set 76112 Batman RC Batmobile offers all electronic PoweredUp components they are needed to control this Tower Crane. Trains (60197, 60198, 60336, 60337) from the City theme are also nice and welcome starting packs for electronics, because they all include one PoweredUp hub and a physical remote pad, which then requires only 2 additional medium motors. Controlling the crane Heart of the design and probably the most interesting part building this model is the controllable gearbox behind the cabin. Where motor A controls the movement of the trolley, the functions of motor B are selected through gearbox. The following configurations are possible when playing with this crane and two motors together: Motor A - Motor B Trolley - Hook Trolley - neutral Trolley - 360° rotation For the crane it is very important to have a neutral position for rotating the superstructure. In case this function is unselected, the crane can freely rotate and prevent from falling. This is a feature that can be also seen on real Tower Cranes. All functions are secured with clutch gears to prevent damage. The winch for the hook has also a safety mechanism included. This holds the cargo even when the function is unselected. Controlling the crane is thinkable easy. In the PoweredUp app it just requires a profile with two slider - one for motor A and one for motor B. That means that this crane is controllable with a custom profile or even with the available one from Batmobile. Keep in mind that controlling the model does not require a smart device by using the physical remote pad. Building the crane Splitted in separately parts, building this Tower Crane feels like constructing the real thing. Official strings (part 37597, 56823) are used in this model that are widely used with many lengths in other Technic sets. Of course you can use any other strings you want. The crane uses a modular building style where each part of the tower fits to each other. The inventory includes all parts that are required to build exactly one middle section, but it is still possible to omit and to create a crane with a lower height of the tower. Furthermore the height of the tower can be extended by replicating a middle section stacked to each other. A higher tower then requires a longer string for the hook for sure. The following inventory shows only the parts they are needed to build one more middle section: Made with Minifigure The cabin can be opened to put a Minifure (without hair or hat) inside. Since this Tower Crane is made in Minifigure scale, it matches perfectly each layout with Trains or Construction vehicles also in the City theme. Instructions Premium instructions for this model consists of 283 pages with high quality images and building steps very close to the Lego Technic ones. The instructions helps alot on how to connect strings and wires correctly. Following are some example pages to show the quality of instructions: Goal with this model was to create a Tower Crane that is not that big and expensive and buildable for everyone. Tons of hours are spent to experience with balancing and stability. The end result is pretty neat, the crane works just perfect but dont expect too heavy loads on it. The model fits all standards for easy building and color-coded components. If you're interested in building this model, you can buy instructions here and support me and my future work. Have fun with this Remote Controlled Tower Crane. Follow me on Instagram for updates and news -
Hi everyone! I want to create an off-road vehicle with these functionalities: - Speed around 13-16km/h - Positive caster angle - Good steering radius - Covering bottom of the car - Vehicle must be as versatile as possible (on-road, off-road, climbing capability) - that is why it is called Frontliner - No melting/damaged axles(or other parts) or at least minimal wear - this is with usage of brushless motor A2212 1000kv - Weight around 1,2 kg - Big wheels 100-110 mm (provide additional ground clearance) - Two-speed gearbox (optional functionality, may be implemented in the future) - Total gear reduction set to approximately 12:1 (including differentials reductions, etc. This still provides good speed of the model with usage of brushless motor) - Pendular suspension (optional functionality, currently implemented and it's very useful) What I will be using (non-lego): - RC setup (DumboRC X6FG - provides gyro stabilization) - Geek-servo motors (those works simply as servo-motor, but with 6 channels of the receiver I might use additional geek-servo motor as switch for gearbox) - A2212 1000kv brushless motor (I was previously using different BL motor, but this one is 14-pole, which means it has shorten rotating angle per-pole and is more precise in working with the throttle than 2838 3200/4500kv BL motor) - Metal universal joints (those are simply more robust than Lego ones) - Lucas oil white lithium grease (used to lubricate gears and axle holes) - 35A ESC - 3s li-po battery This is the first time I am seriously using Bricklink Studio to create a MOC. I had few attempts before, but this time I really pushed myself to at least design front and rear axle in it. Front axle: I used Geek-servo motor to steer the model (the front red weird stack of liftarms is actually it, dimensions 3x3x5). It also features planetary hubs, reinforced steering joints and planetary hubs. Rear axle (heavily insipired on @gyenesvi 42129 C model): We can see here the new differential (knock of part for now. I am soon gonna buy 42157 set to replace it with original Lego one). The yellow UV joint symbolizes metal version of it. Middle section: The yellow stack of gears symbolizes A2212 brushless motor. Between two 5x7 frames I hold battery and on top of that all RC components. This provides placement of all RC components in relatively small place. A2212 motor can rotate around 11100 RPMs at max throttle, then it is gear down 20:28 (differential gear). The differential distributes the power between the front and rear axles, which in my opinion creates less axle load than with just regular 28-tooth double-bevel gears. After joining above components into one setup I received the first prototype: I bought third-party wheels just out of curiosity and I have found that they weight slightly less than Lego ones, with pretty much same radius - 103mm. The body is just something I come up with in one day, I do not worry about that part for now as it is just prototype. At first I wanted to use 23801 steering hubs, but after few test runs with above model they simply couldn't stand the pressure. Other than that, the small steering joints were popping out from wheel hubs during steering on bumpy road. So that left me with only two solutions. Either I will use old portal hubs or new planetary ones. The first ones are more suited for big trucks, at least for me. So the choice was to go with the second option. (We need to wait for the Lego Audi set 42160, hope it will have good steering hubs, that support CV ball joints and are without planetary reduction) With that setup I was afraid that main shaft will have too much speed (around 7900 rpm at max throttle) and axles will start to melt. I was surprised when I took apart the model after hard run, because parts were in perfect shape! Those positive results are I believe because of light weight and short driveshaft. I am far from over with this model, that is why I submitted this topic. There is still room for improvement in those areas (at least :D): - Steering radius is simply poor. I thought that If I will put servo on the front and steering rack as close to the center of front axle it will solve the problem, but appareantly no. If you guys have ideas how to solve that or know any good front axle solutions I will be more than happy. - I need to cover bottom of the car. Shouldn't be problematic, but needs to be pointed out. - Body will be totally new. With 42157 set going soon into my arms and 42136, 42149 already in my hands I will be going with one main color and I believe you know which one I am aiming at. :) - Two-speed gearbox, but It will probably change overhaul look of middle section - Extending rear section. This is tricky one, current solution do not put much stress on axles, but with longer rear driveshaft it would give more "Trophy truck" vibes into it (and I love that :D). Other than stress on axles, this modification will actually shorten steering radius even more, so I am really thinking about implementing it. That's it. If you survived this wall of text I am more than happy. Here is GALLERY for you. Do not hesitate to write under this topic as I am open to suggestions and questions about this MOC.
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[MOD] 10317 Land Rover Defender Remote Controlled
Cyrix78 posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
How do you like my motorized Land Rover? I have tried to hide all electronics completely and keep all original functions. I would really have liked to make it 4WD with diffs, but there is not that much space to hide motors and other stuff in this model even if it is quite big. So for now it is only rear Wheel drive with a straight axle without diff. I might try with a Buwizz instead of Powered Up and add some more functions. Maybe a working winch and some lights? Video available at Youtube Instructions available at Rebrickable -
[MOC] Off-road truck Gaz 66[instructions available]
keymaker posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi, I would like to present my newest creation – off-road truck Gaz 66. It is my interpretation of small, old and very popular truck, which has a lot of off-road capability. Someone can ask why next similar small scale off road truck? I would say I like this type of vehicles, the scale and challenges they bring. And with every build I try to test something new, which I wasn't try before. Here the main goal was to go below standard for those wheels width of the model - 15 studs and prepare narrower axles than standard - 11 studs ones. Which I did. Gaz 66 has 13 studs width body with 9 studs (from rim to rim) front axle - stereed and driven. Thanks to that size of the body is more proportional to used wheels. And you can also use tractor tires provided with cargo for even better effect (you can see such modification in real Gaz 66 on one of polish off-road YT channel - LINK). I also tried to add as many details related to real truck as possible, in this scale, I hope there are here some fan of original Gaz 66 and they will recognise some elements I added. Below you can find video and list of features and details. Enjoy. Instructions: LINK General details scale: 1:20 dimensions LxWxH: 30x10,5x12,5cm weight: 946g Features: RC front axle steering (C+ L motor) RC 4x4 drive (C+ L motor) RC winch with place to lock the hook (C+ L motor) 4-link live axle suspension for all 4 wheels three studs ground clearance (with "KrAZ" tires) openable doors and easy access to spare tire working V8 engine with fan located in cabin, plus grill via which working engine can be watched detailed two seats cabin powered by Buwizz 3.0 but also prepared to be powered by standard C+ Hub can operate with "KrAZ" tires included in cargo Photos: LINK My Gaz 66 is powered by Buwizz 3.0, but there is no problem to use standard C+ Lego battery box: Internals of the MOC, so drivetrain connected with V8 engine, steering and the winch: -
Pathfinder RC SUV [MOC]
Daniel-99 posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Greetings, Eurobricks! I am proud to introduce you my longest and most complicated project! It took me over 2 months to fix all the technical problems revealed in driving tests. Pathfinder is the universal off-roader built for regular outdoor driving. Features: all wheel drive with remote-control 2-speed gearbox Triangulated 4-link live-axle suspension both at the rear and front Brushless motor 1000 kv, 3S Li-Po, GeekServo, RC LEDs Strong transmission: carbon-fiber axes, metal bearing all around, metal U-joints. Realistic 98 mm RC wheels Underbody protection and custom mudguards Every Boy Dream I guess every Lego boy dreams about technic RC car to play with, at least I did. Since 2014 with a release of a legendary set 9398 Rock Crawler, I wanted to build myself a working and "playable" RC Lego off-roader. I was only fourteen at those days, so it took me a while to save money for a 9398 set. The day of joy turned for me to be the first regret in Lego... I was not satisfied with 9398 performance. I spent a lot of time trying to improve the set, but nether succeeded. Every time I felt the lack of power in my car. At the same time the Lego technic community has been growing in numbers, and many RC Lego off-roaders were shown by technic pioneers. I was inspired the most by Sheepo`s Land rover Defender and RM8`s Toyota Hilux. I decided to build Sheepo`s Defender chassis due to the strict limitation of parts available. Well, that car never moved even with wheels attached. Every time i pushed the gas U-joints in the driveshafts got broken. I guess it was caused by some mistakes I made in the chassis. Anyway, the second regret in RC Lego technic caused me to abandon Lego for 3 years. Time passed and Buwizz brick was presented to the community. It provided more power than the PF battery unit. This bring back my hopes of building and RC car with Lego bricks. My first successful project with a BW2 brick was an RC mod of Chevrolet Corvette. Through the couple of years I upgraded my technic parts collection, which allowed me to try bigger and more ambitious projects. With my RC version Jeep Wrangler the dream come true... A true RC off-roader driven by 4x PF L-motors and powered by BW3 unit provided a good speed and torque. Well, if my goals were achieved with jeep Wrangler, than I should stop my story here... The increased power and speed, revealed another problem: the transmission was struggling from plastic dust and hard outdoor conditions... With my next three project I ensured that there is no pure-Lego solution for this problem. Before going further let me explain the goals I wanted to achieve: Performance over details Efficient and durable transmission protected from dust and axle-wearing Max speed over 8 km/h Rigid chassis, capable to survive big bumps Precise handling (caster angle, proportional steering, physical control) Ground clearance over 3.5 studs, off-road geometric passibility 2-speed remote-control gearbox RC setup adapted to Lego and custom parts It was clear to me that plastic Lego parts would not allow to achieve my goals. The key components that required an upgrade were the wheel hubs and the 5x7 frames which hold differentials. Luckily to me I was not the only person on Earth who had this problems. Few AFOLS in Russia developed their custom wheel hubs and 5x7 frames with metal bearings! I ordered them without asking a price! These parts reinforced the weakest components of Lego cars, which allowed me to build several RC projects, such as: Blue Mamba V2, Wilde Beast and Falcon. This project used not only an improved transmission but also a new RC power and control system, which was able to feed PF motors with a constant stream of power. In fact, the system was so powerful, that PF motors started struggling from over-heating. Since I was in a mood of using custom parts, I get myself a Brushless motor setup adapted to Lego. It was designed by another Russian AFOL: a brushless motor A2212 1000-1200 kv placed in a custom Lego-compatible planetary housing. With a new purely RC electronics I started a new phase of advanced Lego technic engineering. Before challenging myself with a big project I decided to test Brushless motor to see its capabilities. I built a Dragonfly buggy V2 with brushless motor and a Unimog trial truck. Both projects proved the power of a Brushless motor. General layout By gaining experience with a Brushless motor in the Unimog project I decided to build a proper off-roader, which I was dreaming off for many years. Since the brushless motor has the dimensions similar to PF XL motor, I decided to use a classical chassis layout with a steering motor attached to the front axle, Brushless motor placed right behind the dashboard and a battery box in the trunk compartment. My Unimog had a similar layout, so I used it as a reference, though some changes were required. The first and most important change I had in mind was the scale. Since I wanted to drive my SUV outdoors, It should be capable to deal with natural terrain, so It should have a decent ground clearance. This can be achieved with bigger wheels and as a result a bigger scale. The choice of wheels As all of you know, the development of a new car starts with a choice of the wheels, which I have a plenty of. You will joke on me, but a plenty does not mean I have the one I need! Let me explain why. Lego has two most common rim diameters: 1.7 and 2.2 inches in diameter. Unimog used 85 mm RC tires placed onto 1.7 inches rims. Such wheels has a great proportions but they was not big enough for my new project. All bigger wheels were based on 1.7 inch rims. As a result they were disproportionally wide. The two sets of 95 mm RC wheels did not fit the future project as well. I surfed trough the net and found a great set of RC wheels, which you can see now on my Pathfinder. It was another win for me! Transmission Since I wanted to use an RC wheels I had to swap the planetary hubs to to the custom hubs with metal bearings. This swap changed the driving characteristics of a car dramatically as well as caused several crucial problems in transmission. Indeed, planetary hubs took a lot of stress from the transmission away, so I had to reinforce the whole transmission in all possible ways. Firstly, I used the reinforced differentials with 12:28 gear reduction. Further I used carbon fiber axles and metal U-joints. Finally, I used custom parts with metal bearings to divide the transmission from the other car components. This prevent any gear skipping and axle melting. Since I wanted to build a fast SUV but not another crawler, I decided to use open differentials both at the front and rear axles. However, I added an auto-lock system to the rear axle at the beginning of the project, which were removed later for practical purposes. Two drive shafts meet together in the middle transfer box. On the upper end transfer box is connected to the motor through the custom planetary gearbox. Gearbox is remotely controlled and has 1:1 and 1:4 ratios. Transfer box had 24:24 gear combination at first, but after driving tests I decided to slower the car down by putting 20:28 gear reduction instead. It turns out that both planetary gears in the motor and in the gear box require lubrications, otherwise the fast spinning satellites get melted. I learned this lesson in a hard way by having two serious breaks during driving tests. I had to order new parts, that costed me both money and time... Front axle The overall geometry of a front axle was taken from Unimog. I kept the upper suspension 6L links, but changed the lower suspension arms to the brick built one. I still do not understand why, but such combination of links provide a great geometry allowing decent flex angles and a slight positive caster angle (then the suspension get loaded by the weight of a car). At the same time the front axle is well protected from side-to-side wobbling. Reinforced lower suspension links provide a great protection for the front driveshaft. In an unfortunate scenario when springs can not absorb all bump energy, lower links prevent the front axle from being pushed backwards, which saves the driveshaft. The wheel hubs were made specifically for live-axle suspension. In combination with inverted 6L suspension arms they allowed me to build a sturdy and compact front axle. Luckily for me, they fit into the rims of my new wheels perfectly: the pivot point of the wheel sits inside the wheel contact patch. Rear axle Unlike the front axle, the final version of the rear axle differs a lot from the one used in the Unimog. Unimog has a 3-link free-swing rear live-axle, which would not fit a faster SUV with the gravity center moved closer to the rear axle. This was easy to fix by attaching springs to the live-axle itself. The real challenge for me caused the geometry of a rear live-axle. Similar to front axle I wanted to use brick built lower suspension links. I made them few studs longer but the 3-link set up did not work at all! Even without the springs rear axle refused to flex normally. I changed the lower links to the 9L Lego links, which gave me a normal flex angles, but this only revealed another problem. I found that with a 3-link setup the driveshaft moves significantly from side to side as well as changes it`s lengh. This might work for crawlers, but it was totally unacceptible for a fast car, so I had to redesign the rear suspension from scrach. In order to keep the driveshaft from unwanted movements, I made it parallel to the lower suspension links. From one side links have a ball joint and from the other just a regular pin connection. Such construction resists the side-to-side wobbling quite nicely, but uses an admissible plastic deformations to flex (since one end of lower links has a pin connection). The single upper arm was changed to a pair of triangulated links. As a result I achieved a decent geometry of the rear axle. Probably one may ask me why I did not use classical solution for the rear axle, given in Toyota Hilux by RM8? Well, because of scale and my main goals of rigidity. That solution worked greatly for 1:14 scale cars built for indoor trial. As long I was building a bigger car which supposed to achieve higher speeds, I had dial with much higher kinetic energy and thus potential load on suspension and transmission. Thus I had to reinforce the suspension as much as possible as well as reduce any unwanted wobbling. The resulting rear live-axle securely hold the drive shaft and does not cause any load on it. Speed VS off-road capabilities After I finished front and rear axles, I had to choose the spring setup. Lego has a very limited springs variation both in length and hardness. The common solution of this problem is to play with the mounting points. One principle I understood very clearly: the closer springs are attached to the wheels, the better responsibility is achieved. Further, the responsibility of suspension fall down significantly if the springs get attached incorrectly, so they bend with the suspension flex. Further I had to decide how soft I want the spring setup to be. The softer it is the better off-road capabilities, but it does negatively affect overall control and stability on high speed. Since the real SUVs are oriented on the speed and control, I decided to do the same choice. My favourite hard 9.5 L springs come very handy for that. Do not get me wrong, with a proper geometry of the suspension, Pathfinder has a great suspension flex (comparing to the real cars), but it clearly can not compare with mad Rock crawlers. To be honest, I would prefer the springs to be a bit softer (0.8 x current hardness) but Lego does not bother about making good suspension kits. Bodywork My favourite real-live off-roaders are Toyota Land Cruiser Prado and Mitsubishi Pajero sport, but I did not build their replicas due to the low skills in modelling. The shapes of the car appeared naturally for me. Firstly I found that 15L wheel arches perfectly fit to 98 mm wheels. The only 15L wheel arches I had came from Lego set 42069 Extreme adventurer. One of my old projects came in my mind shortly. Once I tried to build a Purple Pickup with parts from 42069 set. Well, I was not happy enough with the overlook of Purple Pickup, but I modified the front part of it to use if the next project, namely Wilde Beast. Now I wanted to modify the front part once more to fit my current project. I wanted to build the car in purple colour once again, but Lego does not produce many parts in purple. I found a great 3-d party set containing a plenty of purple! Namely this was a Sembo Technique 701028 set. Summary Before saying my verdict I want to mention the driving tests I made for Pathfinder. All the following tests are presented in the video. Max speed test: max speed is about 10.5 km/h Turning radius test: 0.86 m Stability and handling test: I tried to dive between cones in Zig-Zag trajectory on max possible speed. After 10 minutes training I was able to drive it with average speed over 5 km/h. Low speed suspension test: The car did not performed good here, to pass it a softer springs required. High speed suspension test: Suspension absorb high speed bumps greatly. High stair test: Due to off-road geometric passibility and high torque Pathfinder passed the test even with open differentials. Almighty hill test: I tested the maximal backward roll-over angle, and car was capable to climb into 60 degree hill. You might say that crawlers can do better, but come on guys, this not a crawler, but a short wheel base SUV! Multiple driving tests showed that such placement of a motor protects it from dirt and dust. However I made an underbody protection and custom mudguards to protect the transmission and the cockpit of the car. Now I can give you the conclusion: This project costed me a lot of money and time to finish, but at the end I get myself a robust RC Lego car, which is very fun to drive around. With this project I showed to the community what is not possible to achieve with pure Lego bricks. -
Tamiya hot shot RC - instruction now available
msk6003 posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Finally finish front bumper and fully tested. So I made box art. This is original model's box art. Without bumper, I added ARE YOU HOT plate on backside of wing. Final model spec 2 Buwizz 3.0 2 Buwizz motor with 4WD drive 1 C+ L motor for front steering Monoshock both front and rear like original model 3 speed gear ratio can choose while building(include in instruction) 4.2:1, 1.96:1, 1.4:1 Instruction link -
[MOC] Hornet 4x4 Baja Buggy
Daniel-99 posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello Eurobricks! A few months passed since I shared with you my creations. Well, I was working hard on two RC projects and now I am proud to introduce you one of them! It is called "Hornet" and it is an Ultimate 4x4 Baja Buggy. Technical specs: 4-wheel drive, open differentials Full independed suspension Brushless motor, 3S Li-Po, GeekServo Custom wheel hubs with metal bearings Carbon-fiber axes, metal U-joints Transmission sits on the metal bearings Positive caster angle, kingpin inclination, Ackerman Anti-rowbar at the front axel 98 mm RC wheels understeering Light tubular frame A story behind the build. Half a year ago I bought myself a Brushless setup adapted to Lego. It can provide a strong and stabled stream of power to my RC Lego cars. In two days after the motor arrived I build a first project with it to test its capabilities. Of course, this was a buggy! The main goal was achieved, I was able to test the new system and it performed greatly! Though I was not happy with the car itself. It had technical problems with both front and rear suspension, steering, overview and proportions... During the winter holidays I found a great set of RC wheels on AliExpress. They looked ten times better then all the other RC wheels I had, so I bought them and at once started a new 4-wheel drive project (which will be revealed in my next post). All I will say now, it has solid axle suspension and no planetary wheel hubs. So it appeared to be quite fast and somewhat unstable due to the soft suspension and high center of gravity. I decided to postpone that project and build a fast and more stable Baja truck with the front in-depended suspension and the solid rear axle. The fist prototype can be seen of the picture below (half-way dismantled) and it looks totally weird, especially the placement of the Brushless motor! With such layout I tried to load the rear wheels, but did not succeeded. Despite a completely failed project, I get two important ideas from it. 1) My custom wheel hubs allows to build an advanced front suspension and steering with king-pin inclination, positive caster angle and Ackerman geometry. Also I learned how to use a half stud off-set for the attachment points of the lower suspension arm. 2) The placement of the Brushless motor behind the rear axle greatly load the rear wheels. I was not ready to give up, and decided go bigger next time and use my favourite 98 mm RC wheels. By widening the wheel base significantly I decided to solve the front wheel drive problem! It is well-know that steering rack is usually interact with a differential. Also the steering rack must be placed behind the front axle to achieve the Ackerman geometry. So I decided to move the front differential one stud to the front. The first sketch of the front axle looked very promising, so I decided to "copy" it for the rear axle. Well, to keep the same wheel base as at the front i needed to use the half-stud off set once again and this time on both lower and upper suspension arms. That is why the rear differential is covered with a mess of connectors and beams... Solving all problems with axles, I connected them together via central driveshaft and had to decide how I should place the Brushless motor. The problem is that the motor has a size of a PF XL motor, and so it requires a 24 to 24 tooth gear combination to connect it to the central driveshaft (and place the motor on a side or on top of the driveshaft). I was not happy with it because big gears would stick out from the flat bottom of the chassis. The brilliant idea came right in time! I decided to place the motor behind the rear axle and place the another driveshaft over the rear differential. This allowed me to use a 12 to 20 tooth gear combination! In addition it loaded the rear axle to achieve the understeering feature. It took me another day to finish up the first prototype, and I took the Buggy to an extensive driving tests. These tests took me over a month to complete, since they were interrupted with a melting of the snow. The following improvements were made (one by one): Reinforcement of the upper suspension arm. First version of the front suspension was falling apart on each big bump. Lowering of the suspension by one stud. This was made to increase the stability on the straight line and make the overview of the buggy closer to references. Also I widened the tubular frame for the same reason. Playing with gear ratios: differential swap and swap from 12:20 to 16:16 gear combination in between the driveshafts. Adding an Anti-rowbar with a carbon-fiber axe to the front axle. It was added to increase the stability on the fast corners. Making 3.5 L axes to solve the problem of the front U-joints falling off from the differential. The results. A tremendous efforts had been applied to finish this Buggy. A lot of hard work, tricky decisions and big regrets... Does the Hornet worth it? - NO! As a result I build myself a balanced RC car with a precise control, decent speed (about 15 km/h), enduring transmission and good-looking bodywork. But I would not suggest anyone to follow my way, because it will cost you a lot! If you want to get a good driving experience you would better buy an RC car! LOL. -
LEGO-ish RC RIB Powerboat
janssnet posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Bit reluctant to post this, since this boat is made of a 3D printed hull, the RIBs are made of insulation tubes, the electronics are all RC parts and the motor is a brushless drone motor. NEVERTHELESS ..... It looks like a LEGO boat, don't you think?! And it works great! Happy to share more details if there is interest, happy to remove it, if it's too little LEGO for the forum.
