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Trial Truck: DAC 16.550 FAE
Truck Trial vehicle built for very good off-road performance. It features self-balancing pendular suspension and a V10 engine with fan.
About this creation

Version 1


I started building this MOC so as to have a vehicle which could go on any type of terrain, as my first MOC had very poor on road and off-road performance; so I decided to build a vehicle specifically for off-road, more exactly a Trial Truck with a design based on that of the romanian rally truck DAC 16.550 FAE.


(click on the photos for a larger version)

For the axles design I used Zblj's design for portal axles, but I modified them quite a lot to have pendular suspension with a completely mechanical and self balancing mechanism, which connects the front and rear axles together, for better stability on and off-road. The axles are very well supported on both sides by turntables so as to increase the overall efficiency of the transmmision and steering.



The truck is driven by two PF XL motors connected to the same battery box, each one driving its own axle through the two stage reduction, one near the motor and the second one at the wheels. The final ratio of the transmission is 5:1, a bit too small for the truck's weight. This is why the whole transmission is lubricated, which improves the performance a lot. Despite this, the truck still struggles on steep inclines, especially with the cab mounted.



The other features of the truck are the rack and pinion steering, driven by a PF Medium motor, the V10 engine with functional fan, driven by a PF Medium motor coupled to the drive motors, and the cab with openable doors. The cab has a very simple design so as to keep the weight as low as possible, but because I hurried to finish it, it is not very well fixed to the chassis.



I also participated with this truck at a physics competition, but unforutnately I wasn't so succesful with this MOC as I was with my previous one, the 4x4 Tipper Truck, with which I won the first prize but at a different physics contest. The version with the spare wheel on the back is the version with which I participated in the contest.

Version 2


Trial Truck: DAC 16.550 FAE
Because the first version had some flaws, the most notable being the falling cab, I decided to try and improved some of its elements. Thus the cab was reinforced with 2 beams connected to the chassis, the V10 engine was shorten to V8 one, the rear axle was also shorten and much improved over the first version and I had also replaced some pins in the steering mechanism to reduce friction to a minimum.
The last modification of the truck are the stickers with some of characteristic logos of the brand

Trial Truck: DAC 16.550 FAE Trial Truck: DAC 16.550 FAE Trial Truck: DAC 16.550 FAE


Here you can see a video, highlightnig the truck's features and the very good off-road performance:


You can see more photos here: BrickShelf
For those interested I also made a 3D model, which can be downloaded at the end of this page.

I hope you like it and I am looking forward to your comments and criticism.


Building instructions
Download building instructions (LDRAW format)

Comments

 I like it 
  April 7, 2012
Very nice truck! I love the suspension. One suggestion i have is maybe scoot some weight back towards the middle instead of most towards the front. Anyways, very, very cool truck!
 I like it 
  June 14, 2011
Great! It seems to be working perfectly, I reckon the only reason it struggled on the first hill was because it was a loose surface
 
By Sergiu Vlad
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LEGO models my own creation MOCpages toys shop Trial Truck: DAC 16.550 FAETechnic


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