ORIGINAL: Fabe
if you want to build one yourself using an ESC, you would still need to implement a direction sensor, or else the motor would spin continuously in one direction when you turned the steering wheel. The motor would spin with a speed, and not position, proportional to how far you turned the dial.
True.
There needs to be something "telling" the motor when and where to stop.
Also, there wouldn't be much, if any, holding power unless a pot was involved, correct?
Either way I think you'll get away with using two Quarterscale servos to steer this thing....