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Found 3 results

  1. Zerobricks

    Mini 4x4 racer

    For an exhibition I made a small Corvette-scaled car with an RC motor powering rear wheels. Powered by Buwizz, that model turned to be totally uncontrollable, with epic amount of oversteer at low speed and underster at high speed. So I got an idea. Why not make a 4x4 version of a miniature car? My worries were that the added complexity needed to power the front wheels will increase the complexity, weight and reduce the performance... But I decided to give it a shot anyway. The first version used a chain drive to front the front wheels from the rear axle, but that was soon scrapped due to the poor strength of the chain. So after replacing the chain drive with an axial driveline, I came up with this little, yet powerful model. The front wheels are an older 49,6 x 28VR type which use softer rubber than the rear ones. This way the car tends to oversteer less: In the rear DUAL 49,5 X 20 are used to give it as much traction area as possible: The bodywork can easily be removed to expose a torque-tube sytled chassis and a simple interrior: A servo motor steers the front wheels via a rack. Maximum steering angle is around 22,5 degrees: 3x11 panels are used as the main chassis, giving the model very high rigidity, while keeping the weight low: According to LDD the model is made of less than 400 bricks, less than to the upcoming 42109: The front wheels are powered directly by the rear axle via 20:12----12:20 gear sequence. There are no differentials, since the model reaches high enough speeds for wheels to understeer and slip in the corners anyway. Technical specs: Length: 25 cm Width: 14 cm Height: 10 cm Weight: 575 g Theoretical top speed: ~18 km/h Even with 4x4 drive, the racer still powerslides all 4 wheels even in just the normal mode, as you can see in the quick and drity slo-mo gif I made: I was pleasantly suprised by the amount of control you get with the added FWD. No longer am I at the mercy of the rear wheels to stop the car from crashing into a wall. Accelreation is of course much better, making this one of the fastest accelerating models I made. Oversteer has been reduced, but there is still plenty of power left to powerslide the model with all 4 wheels spinning. Stay tuned for a proper video showing off the performance soon.
  2. Hi everyone, I am pleased today to present you the latest changes to my Caterpillar Ct660: the most important being is that I managed to pass the frame with single propulsion from Ingmar (2legoornot2lego) to a 6x6 chassis! It took me a while to get there, but I ended up doing it by completely redesigning the rear axles. The second change is the addition of a dump bed, which was not at all clear but has been greatly facilitated by the new configuration of the rear axles. For my truck I was inspired by Ingmar's trucks and thanks to him because this is the first time I am able to keep one of my moc as long (for 9 months). Normally they stay nearly 3 to 4 months assembled! Functions Steering done by a servo-motor connected with two universal joints to the front axle; Propulsion: motor-XL> 12t / 20t-> 12t / 20t / differential; LA (tipper): m-motor-> 8t / 24t-> LA The bucket is operated by a switch hidden in a control panel: For the aesthetics of the dump I opted for something simple, that is to say, square edges. And visually, it goes well with the design of the truck. Here are more photos: Fo now I'm petty satisfied with the result of my truck Feel free to ask questions and give feedback. On this good day to all!
  3. AWD MiniKart is my latest creation using three differentials. This is my first attempt at building an All-Wheel-Drive drivetrain, but it was worthwhile the effort. I wouldn't say this is a huge success, but it works well on perfectly smooth terrain. I do have a few ideas for a 4x4 vehicle now ;) It uses two Large Motors to drive the center differential which distribute the power to all four wheels, and the Medium Motor steers the Rack and Pinion setup. I also built a custom base stand for some video purposes; it's not hard to build and has good usages. Any more information you would like will be happily answered. Until NXT timeā€¦ DamonMM2000 Please click to watch a detailed video on AWD MiniKart!