High Torque Subtractors I would like to use a subtractor in my next RC LEGO tank, as it enables the vehicle to turn on the move, as opposed to stopping and then turning.

Unfortunately, the subtractors I have tested so far cannot withstand the torque of heavy vehicles, which either causes the subtractor to break apart, or the differentials/gears to grind.

Does anyone know any subtractor designs which are able to deal with high tension/torque/stress levels so that enormous vehicles can still use them? 3kg-5kg tolerance would be ideal.
It sounds like you need a stronger differential.

Might I suggest this design by Nazgarot:



If you make two, you can build a big and sturdy subtractor like this (probably customizing the gear ratios to your requirements, the right gearing could also remove the need for a PF switch):







Here's a video of it in action: