4 Wheel Drive Too Much Traction

[Ether]

Originally Posted by JesseK

This doesn't make any sense. One mentor makes a conclusion about turning based upon a tool that doesn't tell him anything about how/why a robot turns, then another veteran mentor backs him up? What is this, the Apple forums?

I did the calculation, using what I thought to be conservative numbers:

I assumed the Center of Mass was at the Center of Geometry of the wheels

I assumed the trackwidth/wheelbase ratio was 1/2 (it appears to be a bit better than that from the picture.

I assumed the coefficient of friction of the wheels he's using is 1.2

I assumed the wheels are 6".

I assumed a total weight of 150lbs.

I assumed 10% loss of torque in the gearbox and sprockets.

Using Billbo911's 11.7:1 gear ratio, I calculated ~180 oz-in torque required at each motor.