Zerobricks Posted April 7, 2015 Author Posted April 7, 2015 Zblj, I am surprised that it is holding together. What voltage are you running the system on? Can it withstand full throttle direction changes on carpet? Can it withstand full throttle/full speed obstacles? Can it lift a tire when accelerating from a direction change? When the tires become blocked, does it stall the motors or break something? Do you think that you would have problems if you went to a bigger tire or one with more traction? Much like a full size off road vehicle there is world of difference between a stock truck strength and a purpose built rock bouncer. I wouldn't be surprised if things started to fall apart once you starting abusing the truck. very respectfully, Andy System runs on 9 volts, no modifications. There were problems with this very problem at the beginning, but chaning the rear U joint to the pulley wheels solved that, Going full throttle on an obstacle that is too large can result in an axle link failure or even whole axle falling off, but thats to be expected when you go over a meter per second with a 3kg heavy vehicle. Yes its actually lifts tyres whena ccelerating from forward to reverse due to the eccentric driveline having a much higher torque twist when reversing. This is also why it popped a tyre when going uphill in reverse in the video. Nothing broke when stallking the motors so far... I did put on PP wheels, but they are too wide. Didnt test driving with them though. I wouldnt recommend any bigger wheels. So far only cosmetics started falling off, the chassis holds... Quote
AndyCW Posted April 7, 2015 Posted April 7, 2015 Thanks for the quick reply. It boils down to what we end up doing with our creations. I let my 6 year old boy drive mine around the yard to find weak points. He can uncover the flaws in what initially looked quite strong. v/r Andy Quote
Zerobricks Posted April 7, 2015 Author Posted April 7, 2015 Thanks for the quick reply. It boils down to what we end up doing with our creations. I let my 6 year old boy drive mine around the yard to find weak points. He can uncover the flaws in what initially looked quite strong. v/r Andy Well Its very tough for its size, I had like 3 flipovers with minimum damage, only roof came off so yeah I'm proud of that. Real vehicles are also not indestructable. Quote
miguev Posted April 7, 2015 Posted April 7, 2015 BTW this it flip over because of taking turns too fast? Quote
Zerobricks Posted April 7, 2015 Author Posted April 7, 2015 (edited) One flip over was because the car bumped the inner side of the wall while steering, the other was a combination of high speed gained by setting gearbox in neutral and camera weight on the roof. Edited April 7, 2015 by Zblj Quote
Teo LEGO Technic Posted April 7, 2015 Posted April 7, 2015 Hands down, ZBLJ, one of the finest Technic trucks ever! A 3 kg beast that goes that fast is something pretty amazing. Quote
AndyCW Posted April 7, 2015 Posted April 7, 2015 I think for a model of a mass produced vehicle your truck is admirably robust. Recognizing the level of strength difference between mass produced vehicles and one off tailor made race vehicles is key. Managing our expectations and keeping them in line is often difficult. You have also made me re-evaluate the gear ratios that I use. v/r Andrew Quote
Boxerlego Posted April 7, 2015 Posted April 7, 2015 (edited) Wow, that performed and looks awesome, the video was great too. Nicely done! Do you think you have pushed the LEGO RC unit to its maximum potential when it comes to size and speed with this one. Edited April 7, 2015 by Boxerlego Quote
BusterHaus Posted April 8, 2015 Posted April 8, 2015 The rollovers made me wince. Those poor bricks! I love the combination of speed and low gear performance in this MOC. Looks like a perfect selection of gear ratios for the motors, battery and weight involved. Awesome job. Quote
Zerobricks Posted April 14, 2015 Author Posted April 14, 2015 (edited) Here's the LXF of the chassis: The RC unit and motors are grouped. Download it here: http://www.brickshelf.com/gallery/zblj/G5004X4SQUARED/xamg_4x4squaredchassis.lxf Edited April 14, 2015 by Zblj Quote
grum64 Posted April 14, 2015 Posted April 14, 2015 In my opinion this amazing creation is easily your best build yet. It's brilliant! :thumbup: Quote
__________________________ Posted April 14, 2015 Posted April 14, 2015 (edited) Here's the LXF of the chassis: The RC unit and motors are grouped. Download it here: http://www.brickshel...aredchassis.lxf I would love if someone could create an LXF with the body attached... ZBLJ please I think it should have Sariel's new 4 speed gearbox, it's strong enough it could handle the torque and RPM... I will build an LXF with XL motors instead of RC motors (since I don't have the money for RC motors) Edited April 14, 2015 by TheLegoExpert Quote
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