As any builder of remote control Technic creations will know, LEGO drivetrain components – especially u-joints, axle connections and gears – are often not up to the job of delivering the torque from LEGO’s excellent Power Functions motors to where it needs to go.
Gears shearing in half and u-joints snapping are problems that regularly occur, particularly if third-party battery and software products such as SBrick or BuWizz have been used to increase power far beyond what LEGO envisaged. We’ve even experienced this here at TLCB Towers, as an ‘accidental’ collision between an RC creation and a TLCB Elf can push a part past its breaking-point.
However Eurobricks’ Kevin Moo has designed a cunning solution to the problem, with his Toyota Tundra-esque 4×4 pick-up truck utilising two driveshafts for each of the live-axle suspended differentials.
Power is sent down both sets of components, effectively halving the load on each gear, u-joint and axle connection, and therefore the likelihood of a part failure. It’s an ingenious yet simple solution and one that enables Lego models to take more power, more reliably – watch truck trial builders use this design and then double the number of motors to end up right back where they started!
Kevin’s dual-driveshaft pick-up is also a thoroughly excellent model in addition to its clever driveline. Power to all four wheels comes from a single XL Motor with a Servo for steering, there’s superb live-axle suspension front and rear, opening doors, hood, tailgate and load cover, LED lights, and a realistically detailed body too.
There’s much more to see of Kevin’s brilliant build on Eurobricks via the link above, and you watch how the dual-driveshafts work via the top-quality video below. Take a look whilst we see whether breaking parts in ‘accidental’ collisions with TLCB Elves is a thing of the past (it’s all for science).