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Showing results for tags 'skid steering'.
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As soon as I saw the new parts in the 42159, I knew I just have to use them to upgrade the previous version of the Universal 4x4 off-roader. After tinkering for a few weeks in LDD, and actually building it IRL yesterday, it is officially finished: The V2 has a big list of upgrades comapred to V1. Dual independent drive, one for left and other for right wheels - allowing skid steering Two 3 speed gearboxes - that's right, this is my first off road vehicle with 3 gears for optimal performance Improved steering system - much more direct, accurate and responsive Highly modular design - easier access for maintenance and charging Top speed has been increased by 40% both in low and high gear - the previous version had ample torque, so I geared up all the ratios by 40% and added a middle gear Increased suspension travel at the rear - first time I'm using 11 studs long suspension arms Improved drive motor mounting - now they are no longer at a weird angle Similar part count to the V1 - even though it's 2 studs longer and has way more functionality it has only 20 or so extra parts, totalling at 796 (I tried to keep it under 800) Here you can see how the model looks in LDD: Overview of drive, switching and steering drivelines: The dual driveline is powered by 4 BuWizz motors, 2 motors for each side. The lower PU L motor moves the steering rack via an 8 tooth gear. A second, higher mounted PU L motor spins 4 wave selectors via 8 and 28 tooth gears which in turn switch between the 3 gears. The gearboxes have the following gear ratios: First gear is 20/16 = 1,25 - totalling 4,32:1 gear ratio from motors to the wheels Second gear is 24/12 = 2 - totalling 2,7:1 gear ratio from motors to the wheels Third gear is 28/8 = 3,5 - totalling a 1,37:1 gear ratio from motors to the wheels Thanks to the 3 speeds gearboxes, the model has plenty of torque to climb at 45°+ degrees angle, yet can also reach a speed of over 18 km/h, making it my fastest dedicated off-roader to date: Testing it outside, jumping over pump track course, driving through tall grass, etc... I have yet to encounter any major issues. The model is reliable, fast and can take a beating/rollover with ease. So far I'm really happy with it and can't wait to record more media and publish it soon, so stay tuned! -
This model is a result of the lessons I learned while building a mini racer and failing. You can find more details about that here: To create a better mini racer, I increased the scale from 1:16 to 1:12 which allowed me to implement the following functions and features: Independent left/right side All Wheel drive Independent suspension on all wheels Dual 2-speed gearbox Steeering angle of around 30 degrees Working steering wheel Full interior with 2 seats Opening doors and bonnet Built out of 999 pieces Measures 35 x 16 x 10 cm Weight of 1 kg For color, I had the choice between orange and lime, so I went with lime for that Lamborghini look with gold rims: And here's the LDD version in all of it's 999 parts: Here are more photos of the individual groups, starting with main driveline: Gearbox switching system actuated by a PU L motor: Steering and rear hub support system: And finally the suspension system which also provides support for the bevel gears: The driveline is the most important part of the model and it uses two 2-speed gearboxes, each driven by both outputs of the BuWizz motors. A PU M motor switches the gears using the wave selectors. Suspension is supported by 8 hard shock absorbers. The suspension is at quite a high angle of around 25 degrees in order to keep the drive motors, steering motor and BuWizz as low as possible. High suspension angle also pulls the wheels together, allowing for a narrower bodywork. A PU L motor provides some 30 degrees of steering angle to the front wheels and also steers the steering wheel via a secondary steering rack. Everything is powered and controlled by a BuWizz 3.0 hidden in the front. Here's how everything looks like inside the model: More details and video of the model in action can be found in the video: To finish, I'm really happy both with performance and the looks of the model. It for sure fixed and improved mostm if not all the issues with the previous, smaller version. I also can't wait to compete with when the next opportunity shows up.