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Found 10 results

  1. Hello everyone! I want to share with you my Monster truck that I build for an outdoor winter driving. It has a lot things to improve, but even this imperfect build gives a lot of fun! Yes, this post is mostly not about technical aspects, but about the whole concept and the driving experience it gives! Some highlights: All wheel drive and steering Solid axle suspension with permanently locked differentials Planetary wheel hubs Strong transmission with metal U-joints and metal bearings Brushless motor 1000 kv 3S Li-Po for power 2 GeekServo for steering 120 mm RC wheels with great grip Removable body Together big wheels and powerful motor makes this Monster Truck a real beast. It has both torque and a decent speed. Planetary wheel hubs give enough reduction to obtain the precise control of torque (that is rather unusual for Brushless motors). All wheel steering with deferent steering modes (made as an option of my RC transmitter) bring more fun to the driving. It also increases the climbing abilities of the Truck (as it is shown in the video).
  2. Here is my first attempt of building a rc trophy truck: Thanks to @brickosouch for the Inspiration and sharing the stl files for ball bearing lift arms!
  3. For those not afraid to mix LEGO with RC components, you might like this one: iWD4. A 100% LEGO chassis and body, driven by 4 brushless drone motors placed inside the wheel hub. In-wheel drive or independent wheel drive. The result is spectacular. Great speed, great control, and hardly any wear-out, since there aren't many moving parts. The rims are LEGO compatible and 3D printed, the electronics are drone based, steering is done by a LEGO compatible Geek servo. Rest is all LEGO, including suspension and removable body. Please have a look at this short intro video. Happy to share more details.
  4. Hello everyone! I am glad to introduce you my Mercedes Unimog U4000. I made it last autumn for trial competitions and it became my first successful RC Lego model with Brushless RC motor. Technical aspects: - Brushless RC motor 1000kv with a custom 3D-printed planetary gear. - Custom 3D-prined planetary 2-speed gearbox with remote control (by Geek Servo) gear ratio 1:1 or 1:5 - RC remote control - 3S Li-Po for power - Geek Servo for steering - Transmission with metal bearings - Planetary wheel hubs - 4-link live axe suspension at the front - 3-link live axe suspension at the rear with free articulation - 85 mm RC tires - Light-weight bodywork, total mass is about 1.2 kg I tested this car on various terrain both indoor and outdoor. It reaches about 8 km/h on normal speed and about 1,6 km on low gear. Since the transmission has several reduction gears (made with planetary gears) Brushless motor feels good in this trial car. It gives the truck more power than it will ever need, so the truck can take a significant weight on board (if one change shocks to the hard one). Oscillating real live-axe and grippy tires provide a constant contact with road, so the truck climbs rocks easily both with closed and open differentials. Due to the reference, the gravity center of the truck is moved to the front, so it struggles a bit with going down the hill, but appears to be a great climber. It can beat Lego Zetros both on low and high gear!
  5. This buggy contains a 3600KV brushless motor (2838). It has a pinion made from a LEGO axle and it runs a seriously good working drive-train. Together with the new 42109 differential and a (new?) 2D suspension method it turns out to be a fun car to drive. Please watch a video here. Especially the suspensions are worth having a look. More and more I'm using custom springs to create all sort of applications. Useful and useless. Almost useless is the spring-lock to open the hood. Very useful are the long front springs and the two-dimensional rear springs. Please let me know your comments. No building instructions available yet. If there is a need, let me know.
  6. Finally finished a first version of a LEGO RC Car with 2 in-wheel, brushless motors. While I know some of you hate the combination of RC electronics and LEGO, others enjoy these hybrid models (hence this post). If you are more the purist type and in favour of LEGO only, please skip this. If you like stretching the envelope using (RC) electronics please have look and let me hear your thoughts. While searching for brushless in-wheel motors I ran into the ideal product: Turnigy Multistar 4225-610Kv. It mounts easily onto LEGO (same measurements) and fits almost any 56-rim. The result is spectacular. Great speed, no wear-out, all traction goes to the wheels, no gears necessary. Sadly, it turns out this motor is no longer available (working on an alternative). Car also includes an (adjustable) software differential running on an Arduino Nano, works surprisingly well. When fully applied the car has serious oversteer, when turned to 0 the car has understeer. The body of the car is a 54100 modified boat hull . It took some cutting but ended up nicely. Please have a look at the video here:
  7. Chanced upon this video while browsing youtube just now... I'm not in any way promoting the use of 3rd party parts () here (it's individuals' tastes after all), but I thought this video pretty much gives a rough gauge to all of us what pure Lego, when combined with brushless motor (i.e. no lubrication, no bearings, no other metallic 3rd party hobby-grade RC structural/mechanical components), can do... how Lego parts (especially differentials and universal joints) survived at such speed, for a roughly 1 kg model (my own model weighs 3 kg and if I accelerate it hard, the rear-front-middle differential and universal joints will complain)... and the control range to be expected using rc-grade transmitter/receiver. and if the speed claimed is accurate, the 68.8 mm wheels would have to be spinning at close to 6k rpm - depending on weather conditions this is probably the top limit before Lego axles melts (this limit will go down the heavier the model is).
  8. Hi folks, This is not for purists. Contains modified and non-LEGO parts. My urge to build a super fast LEGO RC Car often stopped at the stage where the body needed to be build. Seeing all the great designs on forums like this, it somewhat discouraged me building my own. Besides the fact that these bodies come with some weight and will not hold a crash a higher speeds, I had to come up with something else. As a result of an earlier project (building a fast LEGO boat) a had some damaged LEGO Hulls (54779). Since a car body works basically the same as boat hull (but 180 degrees rotated), I thought I'd give it a try. Have a look at the result in the YT video. It works fine. Gives strength to the car, the aerodynamics work well for good driving stability and it is not that ugly :) Called it The LBOW (Lego Boat On Wheels). Included standard RC components: ESC, brushless motor, 3s Lipo battery, digital steering servo and .... a Gyro. Resulted in a very fast RC Car. Theoretically this should be able to reach 100 km/h. Speed test will follow (need to find a good track first). For those trying to do similar things, I'd strongly recommend to add the Gyroscope to your car. It prevents the car from breaking out at higher speeds. Very useful.
  9. Inspired by Lego's Ferrari 599 and Enzo models, I've created something 'beefier' . Main characteristics: Measurements - 50 cm (L), 25 cm (W) and 15 cm (H). Weighs 2.5 kg. All wheel drive (AWD) with 3 open differentials. Full independent suspension. Steering - KPI, Caster, Progressive Camber, sharp steering up to 40 degrees. Towerpro MG995 Servo. Powered by a brushless 4370KV motor at 9 volts . For fun and laughter .
  10. Hey Guys, In this thread I'll introduce my race/trophy truck It features caster, kpi, long-travel suspension (front independent, rear fixed-axle) with damping, RWD, manually functional LED lights, hood, doors, extendable door steps, and moon-roof. Rather sizeable, at 4kg, and 65 (L) x 31 (W) x 30 (H) studs in dimension. Weight distribution is 50:50. And here's how it looks underneath... There was no modification to LEGO pieces, and no 3D printed parts were used. However, I've opted to use 3rd party components (mainly the electronics) because where I live, TLG does not deliver. There is a local shop selling LEGO stuff, but is often poorly stocked when it comes to Technic/PF components. While I do realise that these won't integrate readily with LEGO Technic pieces, and wiring will be messy, I was willing to give it a shot because they offer better performance and configurability. I started off wanting to include a gearbox (at least semi-auto if possible), camber and ackermann, full independent suspension, 4WD, etc. But as you'll see in due course, I encountered challenges either directly or indirectly due to my use of 3rd party components . I will provide more details about these later on. For now, suffice to say that there is some sort of a dilemma here - With LEGO PF, I can probably incorporate all these features, but I'll end up with something that drives like a tortoise (which defeats the purpose of having these features in the first place). However, with 3rd party electronics, I'm able to drive much faster, but that also resulted in the need to build a stronger model to withstand occasional crashes, and stronger drive-train to handle greater torque, and all these bits and pieces add to the resulting weight and size (don't forget that I need additional pieces to act as 'bracing' for the 3rd party electronics too). More details later on... For now, I've prepared a short video: In subsequent posts (assuming that there is sufficient interests), I will describe the challenges that I've encountered, and how they contributed to my current design decisions. Roughly, I'm thinking of elaborating on these areas: - Steering Axle/Hub Design (including how I incorporated a 3rd party servo) - Drive-train Design (why and how I gear down the brushless motor way before the wheel portals) - Suspension Design (why do i use this part, among other things) - Any other areas that you guys want to know more about...