[sanddrag]

Thanks for explaining the turning in place thing as well as many other things. I knew about the torque being equal and opposite and that sort of thing but I forgot about one side cancelling the other in an axial spin of the machine. I completely understand everything now.

For motors, I plan on using one 24V wheelchair motor (right angle drive with internal reduction) per side of the machine directly connected to a 16" diameter wheel. (with additional axle support of course) I don't know what kind of torque they have but they go about 115 rpm max no load at 24V. These motors are fairly large, about 4" in diameter and 8 inches long for just the motor part itself. So, I was thinking it wouldn't have any trouble with the task especially with it's slow rpm after the reduction. The torque has got to be there, I just don't know the exact number.

Can someone tell me if wheelchair motors would be suited for this project in the manner I described? I know the Knight Krawler uses window motors and the Craigway uses FP's both of which are considerably less pwerful. Don't worry about size, I just want to know if the wheelchair motors will be powerful enough to directly turn 16" wheels.