Daniel-99

Planetary hubs provide steeper turning angles, but there is another solution: to use one Buggy motor instead of two, and one Buwizz unit! It will lighten the car and reduce unused torque!

Hello everyone! I have been lazy in the last two months with making new posts... But today I would like to snow you my DEEP MOD of a Lego 42099 set. This project was build in September of 2021, so it was build tested, improved and disassembled quite some time ago . Features: Original body of 42099 with custom RC chassis 4-wheel drive independent suspension with positive caster of all 4 wheels Double steering arms (for stability in jumps and bumps) Ackerman steering geometry with minimized stress on the joints 2 x Buwizz motors for propulsion C+ L-motor for steering 2 x Buwizz 3.0 for power (one unit is enought but I used two for longer driving distance) Total mass ~1,2 kg Planetary hubs, and fast output of Buwizz motors provides a lot of torque and a decent speed The beginning of the project Last summer I build myself a Red coupe. It was a good car, which is cool to drive. But,.. It was not adapted for the Russian roads . After several bumps and crashes, I decided to build a car that will overcome all obstacles on the road. So I started a new project, and all the circumstances (which will be shown later) strongly influenced the outcome! Then I was building a Red Coupe, I needed more red parts, so I bought two Ducati 42107 sets. I got charmed by new motorcycle wheels (i was dreaming of a car with such wheels)! The motorcycle wheels are light and have big diameter, that is important on the bumpy roads, so the wheels for my project were found. Also, at the very beginning of September I bought myself a 42099 set and I wanted to improve it with my new Buwizz motors. With 42099 I get planetary hubs which I desired to test from the time of their appearance, so all the choices was made! Underlying Ideas The main goal was to make a car with buggy motors (Buwizz motors) and a strong suspension. Also I waned to use planetary hubs since the original 42099 car has them. I have already learned that to be able to control a fast car, you need a well-designed steering system. As a minimum it should have a positive caster, and the double steering arms will also strengthen the steering system at the bumps.The main question for me was the following: Should I try myself in building front wheels drive, or not? Red Coupe project give me quite some experience in building solid suspension with positive caster: with steering at the front and with drive motors (without steering) at the back, but I never build a front wheels drive with positive caster and Ackerman steering geometry! My head was troubled with a problem: How can one fit differential and steering rack and a "broken car frame" (for castor) in between front wheels? Well, after a month of thinking, and multiple unsuccessful attempts, I found the solution. The idea was to make a horizontal car frame with suspension arms angled! My build is a little bit "illegal" since it uses the right triangle with side lengths 4,4,1, but it totally works with admissible Lego flexibility (an axle in a pinhole can wobble a bit). The steering motor and a steering rack was placed over the differential. The last problem it the project was with front joints. I waned to minimize the stress from the suspension travel and the steering. Since the car frame was build horizontal while the suspension arms were build at the positive angle, it was impossible to make the drive shaft lined with suspension arms... I placed the output of the differential a bit further to the front of the car, so the drive shaft was going a bit backwards from the differentials to the wheel hubs. This trick allowed me to make an Ackerman geometry without limiting the steering angle (in order to keep the front joints alive). After I overcome all the problems with the front wheels drive, the rest of the car was build by one evening! The drive shaft I used the fast outputs of Buwizz motors (one motor for front and the back). After that i speed them up with 20:12 ratio and connect to the differentials (20:28). Finally, planetary hubs slow the speed by 5.5 times.... Planetary hubs allowed me to have a bigger steering angle, but they slowed the car dramatically ;-) Although the max speed is good: ~7 km/h, so it is quite fan to drive the car during a wak in the park. 4x4 drive and proper suspension with good ground clearance (comparing to the Red coupe) make the driving experience very relaxing: no worrying about the bumps on the road! I can prove my words with a short video: Conclusion As a conclusion, I can say, that this project was very challenging for me, but the result is very satisfying: I really enjoyed driving it around my neighborhood. The main drawback of the model is that the Buggy motors uses too much power, and most of this power transforms into torque, and the car has way way more torque it will ever need!

Yes, I had a lot of fun with it! More fun than you can even imagine ;-) Cold does not affect battery that much at -10 degrees. Lower temperatures really affect my hands, so I can not control the car with my phone ;-)

Well done! Especially I enjoy 4x4 configuration and the rear axle, while the front axle is quite arguable for me: in the initial position joints are angled too much... Especially on the high gear car will have struggles with maximal steering angles. I would lower a car a bit to reduce extra stress form the joints.. Or even made the front suspension with 2 positions: lowered for high speed and lifted for low speed (for crawling). But all in all, this will be only a small "improvement" of initially good car (cant say this about improvements of Zetros set ) Also I would really enjoy seeing this buggy with different wheels: RC tires of motorcycle one! P.S. I think this car has no problems with extra weight as the original set

Hello everyone! I know, that Christmas has passed, but i think it is not the reason to wait for the next one to show my new car. It is build on the same Chassis as my Jeep Wrangler [trial mod] Features: 4 wheel drive with locked differentials live axles suspension with 9.5 L shocks 4-wheel steering 120 mm RC tires with high grip 4x PF L-motors for propulsion PU L-motor for steering Buwizz 3.0 for power light tubular bodywork 1.15 kg of total mass (wheels are heavy!) 7 studs of ground clearance I would like to note, that this car is not a proper rock crawler due to the limited suspension travel. All this modifications took about 2-hours of build, but the car give a lot of satisfaction driving in the snow. It is capable for driving in the deep snow and climbing steep icy hills! I conclude, that this project is 100% successful! Hope you like it!

Well, your ideas are more complicated than mine. I basically used two sets of shock in such a way that second pair of shocks activates only at 1/2 of suspension travel. This solution does not require axles in pinholes but an extra pair of shock.

Here is my second version of a car. And as you can see, it became a trophy truck - sorry! Features: Soft suspension with big travel. It is well balanced, so the car compresses it by 1/3 under its weight. It allows to keep good contact with ground when the wheels fall into holes. Double wishbone front suspension with 9L arms - yes, I made it, since McPherson suspension was too weak for jumps and stability. Double steering arms and a PF Servo for steering Asymmetric discs and RC tired works a lot better than the tractor tires, lowering the resistance for steering Big caster and flat surface of tires provides a stability on straight lines. Anti row-bar for stability in tight corners RWD with 18L arms and progressive shocks hardness (learned form https://www.youtube.com/watch?v=KNmC-PlUCp4) no gears in transmission 2 Buggy motors for propulsion 2x Buwizz 3.0 for power Low center of gravity (all electric components are placed as low as possible) 1.3 kg of total mass About 10 km/h Here is my first drive test: I never thought that driving on icy road is so fun! Is it worth it? - yes it is! And finally i got myself a car that goes with a decent speed and does not afraid of bad road (cant tell this about my Red Coupe)!

Well done! Especially love the back of the car with a dynamical shapes! It is sad that the original set has L and XL motors instead of two XL motors... Different motors can not be directly connected in the transmission, and it limits the Trial capabilities of the car.

Hello everyone! Today I want to tell you about one of my latest MOCs. This model is build on the same chassis as my Jeep Wrangler. So it has a very close technical characteristics: Features: Universal chassis Live axle 4-link suspension 4 wheel drive 4x PF L-motors for propulsion (2 for each axle) PU L-motor for steering Ackerman steering geometry (not that essential for off-roader ) Buwizz 3.0 for power 1.4 kg of total mass, well-balanced >80% of parts are taken from 42069 set (except motors, new joints and few more pieces...) RC tires 90 mm I build this pickup for several reasons: I love pickups, especially Mitsubishi L200, this car has the best body, that tells about the speed and off-road capabilities of the car. I wanted to make a brother to my Jeep Wrangler. This will allow me to drive with my friend. I really like purple color from 42069 set I wanted to work on the chassis of Jeep Wrangler without disassembling it. RC tires has good proportions and give a lot of inspiration to me. For me the development of a car begins with the choice of its wheels. Beat any possible motorization of Ford Raptor (original chassis of raptor is only RWD and very weak for RC!) This car has modified chassis from Jeep Wrangler. I made several optimizations. You can compare it with chassis of RC cars - they have the same principles! Again this car has a good suspension with 9.5L shocks. While I was developing a body for a car I tried to hide wheels under the fenders. You can see on the pictures below that wheels can "hide" under fenders when suspension compress. Poor little 42069: The best thing about this car, is that it can drive really well! The playability is great! Here are several short videos with Purple Pickup: I want to make the instruction for this car as it was made for Jeep Wrangler. But it will take me quite some time, so be patient!

Cool! Are you going to add a positive caster on the front wheels? It will help you a lot with going straight P.S. Look at the car on my profile pic - it has 2x Buwizz Motors and I made an electronic differential for it. Even with positive caster, camber and zero scrab radius it can not go perfectly straight, and it is a shame because then you go 9-10 km/h the straight position is 100% wanted ;-)

Man! This is awesome! I really enjoy fast cars made of Lego technic! My only question would be to the front suspension. Is it OK to use small hubs for wheels especially if the car will jump form time to time!

Hello everyone! Wana see a real driving test? Here it is: As you cam see, 4 L-motors can really make these cars drive! Jeep Wrangler has 90 mm RC tires while the Puirple Pickup 85 soft RC tires. The difference in resin is visible in snow: soft resin was always covered with snow... But it will work for summer rock-crawling I suppose!

I would suggest buying RC tires that fit Lego rims: Inner diameter: 1,55 inches, and 1,10 inches wide! You can see how they look on my car:

Congrats! Your MOC is better than the lego set! 4-wheel drive is a big benefit to have! And it has a remote control with even a smaller size! Fantastic!

Im glad to announce, that the instruction is available here: https://rebrickable.com/mocs/MOC-93754/danil.nig/jeep-wrangler-rc/?sort_parts_by=2&sort_parts_dir=D#details

Wow! That is genius! I was not expecting to see such a solution! Great!

Here is a small update. The main goal for me was to make the connection of a steering rack with a gear straight! At first, i tried to use joints and keep the steering motor horizontal.. After several unsuccessful attempts i understood that a single universal joint cant turn this big angle i have, and two universal joints brings too much unwanted structures - heavy, not very stable, messy... So i decided to place the steering motor at the same angle as a steering rack. Suspension will be mounted to the 7x11 frame

Yea, some B-models would be nice to have... But you know, that Lego B-models will not be as good as custom projects, just because Lego do not have thousands of Designers working on the same build ;-) As far as i can see, the market of Lego B-models going well nowadays, and it is very nice to see how people made projects with such a limited build-pallet, and this custom projects appears to be better than the original one!

Thank you for your comment! I have 3 videos for now, but they are showcasing the TRIAL MOD of the car (with portal hubs), so the stock version drives 5,5 times faster and thus has a lot lesser torque... I will make a video with a fast version later. And for now: Here are two trial competitions I made! Sorry for the video quality, I have zero skills in them. Also in the last two videos i was playing a role of a driver and operator of the same time... Zetros has a lot of problems with geometrical pass-ability, while 9398 perform really well with small changes: 1:3 ratio in hubs and Xserion tires. Does it drive well? In is not a fast car for flat surfaces, so it is boring to drive by roads, but it has very good for trial! Since the car has 4x L-motors for propulsion (twice as much as common lego set) and a total mass of 1.5 kg, it perform really well! Actually, it has more torque than the Zetros set! If you want to see a faster version now, my purple pickup (i will make a post on it later) has an off-road setup (with new differential instead of old one) So the stock model will go even faster than the purple pickup! By the way, the off-road version pass all the trial tests except "high stair test", and due to my research it very close (in torque) to the 9398 set, but 3 time faster! Thank you! Hope to see your version. I think it will be a lot lighter! (about 1,1-1,2 kg)

Great MOC and it drives well! ;-) Also you have a cool and well-written story behind the build. I would warn readers that this story takes 3 cups of coffee to read through! But it is too interesting to skip! The amount of care for the drive-train is astonishing! Probably im too stupid im building live axles but i did not understand if the rear axle has an articulation (it seems that both rear wheels could only move up and down simultaneously). Do you use an admissible wobbling of lego parts? Also i really like how you mentioned some other authors in your story... It is very good to see the story of wide-world development of RC lego technic models. P.S. It would be great to see your car on custom tires (85 / 90 mm)!

Very well! One thing i would recommend to add is the new rims from Defender ;-) Keep building!

Thank you for your big and useful comment. Im not good enough at bodywork as you might understand, and yes, I place the drive experience as a top priority, so some decorative parts are missing ;-) (in order to lower the weight...) But I believe, that a PRO builder would get all thous details without adding extra weight! I have posted my MOC at Rebricable, but does not pass the checking yet. So the link for PDF instruction will be available soon. The Rebricable version will have 7L shocks in front (to make the car lower, stock version), but the bridges are easily customizable. If i would tell you a full story of the build, i started not with the body but with chassis. And the general idea for the chassis was inspired by Attika`s Pickup X: But after some time i changed it a lot... Add 2 more L-motors. I REALLY like the idea of Live axles... it totally changes portal hubs!.. But to build it you need to modify several parts! Benefits: - high ground clearance - no stress on the transmission - good scrab-radius (that is 3 times better than with portal hubs) Here is this crazy trial version: I think, it is possible to obtain even better articulation by moving the mountain points of strings closer to center. The double soft strings are very appreciated to handle this body (hard 9.5L strings are too much). Also, I will make another video with the car that is build bu Rebricable instruction... But it will take me sone time ;-) P.S. Wrangler has 90 mm RC tires and purple pickup (I will speak of it later) has 85 mm RC tires... Hope Lego will come up with this tires some time case they bring a lot of realism to the cars... P.P.S. Cant wait for your RC MOCS, gyenesvi!

Hello everyone! Im glad to introduce a new RC MOC that I build! It is not a 100 replica of Jeep Wrangler, but I was inspired by it while building the bodywork. The instruction could be found here: https://rebrickable.com/mocs/MOC-93754/danil.nig/jeep-wrangler-rc/#details Features: - Universal chassis - Live axle 4-link suspension - 4 wheel drive - 4x PF L-motors for propulsion (2 for each axle) - PF Servo motor (or PU L-motor) for steering - Ackerman steering geometry (not that essential for off-roader ) - Buwizz 2.0 (Buwizz 3.0) for power - 1.5 kg of total mass, well-balanced - admit a trial mod with planetary hubs and 4-wheel steering! - >90% of parts are taken from 42110 set (except motors, new joints and few more pieces...) I have to mention, that the front of the car was taken from gyenesvi`s MOC. But I made it 2 studs wider and use my own mounting system to connect it to the custom chassis. https://rebrickable.com/mocs/MOC-81354/gyenesvi/42110-c-model-jeep-wrangler-bruiser-conversion/ Here is the chassis of my car After taking the previous photo, I made a new body for it! Here is an official video! Hope you like it!

That is too clever idea for me to think of it by myself!

Red Coupe [RC MOC] Here is my first MOC in 1:10 scale. I have not enough skills in bodywork yet to build an existing car, so this is not a real one... I did not come up with a good name for it, so your suggestion in the corresponding topic are welcome! Features: Full independent suspension with positive caster on each wheel RWD One Buwizz motor per wheel Electronic differential (programming feature made for go fast in corners) PU L-motor for steering Ackerman steering geometry, camber, zero scrab-radius Powered by 2x Buwizz 3.0 The center of mass is moved closer to the rear wheels in order to get a better control and stronger grip on rear wheels total mass 1.63 kg Full story of the build is linked below: