Hot rod wrecker built for the TC6 contest hosted by Eurobricks (February, 2015). The task is to build Technic model that's prepared to use an SBrick (four remote controlled functions).
Remote controlled features:
-drive (2 × PF L)
-steering (PF servo)
-2-speed gearbox (PF M)
-auto crane with winch (PF M)
-live axle push-rod suspension
-working steering wheel
-working gear stick
-working V8 fake engine
-custom stickers (stickers are covering only one piece each)
The front and rear axles are live axles with four-four trailing arms and Watt's linkage which prevents sideways motion with a much more vertical motion in contrast with the Panhard rod. Watt's linkage is quite popular in hot and rat rods' suspensions.
The axles have push rod suspension instead of being directly connected to the shock absorbers, and this ensures that the load on the shock absorbers are longitudinal. This results is a very responsive suspension with low friction. Actually this is the best suspension I ever built on my own.
The front push rods are attached to the lower trailing arms, just like in many hod and rad rods.
In the steering system (Pitman arm + drag-link) everything is doubled to minimize backlash. There is quite amount of backlash, and surprisingly enough, the most backlash is not caused by the linkage but the gearbox (only a gear reduction and a doubled bevel gear pair). Despite the backlash, the car drives okay but doesn't like bumps.
-Weight: 1520 grams with batteries and the dummy SBrick
-Size: 48 × 22 × 16 cm
-Scale: approx. 1:9
The pictures below show how the model would look with an SBrick istalled.