OpenZ - 4WD - 4xAAA (based on TRQ1) (4WD4AAA_V2.3)

thingiverse

This is a 1/28 OpenZ R/C chassis. I just broke my TRQ1 (mini-Q) chassis and decided to design my own. It is 4 wheel drive and designed around 4 x AAA batteries. I decided to keep ALL THE FUNCTIONNAL COMPONENTS and put them in a new 3D Printed chassis :D So : Transmission, diffs (rigid axles), servo, main board, motor, knuckles, axles, bearings are original from TRQ1. Dimenions are the following : - 93.75 mm wheelbase - 116.5 mm chassis lenght - 54.00 mm width between wheels - 59.30 mm chassis width - 71.00 mm total width First let's talk about the problems with the TRQ1 original chassis : - Horrible weight distribution with the 4xAAA batteries on one side and motor on the other. - Cracking plastic when unscrewing differential covers and electronics plate. - Fragile and quite climsy chassis - No adjustements anywhere - Steering angle is quite low with only +/-20° I'll be adressing those problems as we go. but for the moment : - Batteries are placed under everything, lying as low as possible. They are accessible by the underside of the chassis. They are mounted using AAA plate contacts found on amazon : https://www.amazon.fr/Gjyia-plaques-Ressort-Batterie-Contact/dp/B082SLCMT2/ref=sr_1_3?__mk_fr_FR=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=AAA+contacts&qid=1587901049&sr=8-3 - Plastic screws are replaced with: 8 x M2x16 countersunk screws 2 x M2x6 countersunk screws 6 x M2 nut - Chassis is way more stiff with the new design. - Steering Angle is augmented to +/-35° using the same servo but with a new, longer, servo head. After some tests, it appeared I was right about weight distribution, now it drifts evenly in both directions :D Yay ! and even better than before. The augmented steering angle helps a lot with saving failed drifts and lauching them too. Here ya gooooo : https://www.youtube.com/watch?v=p_maU1PrFMQ https://www.youtube.com/watch?v=e4zUvdRYPdo&t=1s Everything was 3D Printed without supports, in PLA, with 0.3mm layers. As you might have seen, the electronics are not sorted out for now... They are placed over the chassis, mainly with hot glue and double sided tape ^^ - Receiver+ESC is placed around the same spot it was on the original TRQ1. It is held in place with hot glue - Servo is placed on the right side, but oriented the same way it was on TRQ1. It is held in place with double sided tape - Motor is positionned at the back, between two plastic ridges. You can add paper/plastic layers under the motor fo find the perfect gap with your transmission. Well, that's all for now, I'll be working on : - Making brackets and mounting points for all the electronics - Adding a way to adjust motor placement, thi will help with different motor gears - Making Camber and Toe adjustable too. (SOME PICS ARE FROM OLDER VERSION, DON'T MIND THEM) 1967 Ford Mustang shell is over here, for anyone interested : https://www.thingiverse.com/thing:4281093 Seen you soon with a better version ;)