[greencactus3]

no, that wont rotate faster. actually slower as it will have more scrub. if you want fast turning, have the 2 powered wheels parallel to eachother with the axis of both being on the same line.


W........................W
H........................H
E........................E
E........................E
L........................L

the easiest way to prove this is make a model. doesnt matter how small. lego/knex would work just fine.
just make a rectangular frame, and mount the wheels in a 'normal' 2wd configuration and spin it. it spins quite well with the turning axis (yaw axis) in the direct center of the 2 wheels.
now try it with the diagonal setup.
see? lots more scrub because the yaw axis is at the center of the 2 wheels and that means the line connecting the yaw axis and the center of the wheel is not perpendicular to the wall of the wheel. which means it scrubs. if you want to know more about why scrub is not optimal, look up ackerman. you will probably find info about car steering and how the inside is tighter than the outer. wel anyways. i would say this diagonal is not a good plan. hard to drive, and there is nothing that is better about it than a normal 2wd. if you want fast turning, make a 2wd machine with the yaw axis right on the center of gravity. to make it go straight easier, have the center of the yaw axis behind the cg as so it will "push" but this means going backwards will "pull" which equals very sensitive to non equal right and left power outputs. so the most consistent, easy to drive 2wd in an application that will go equal amounts fore and aft id say is center 2wd. which there are threads against and for, again the search thing will work well to look these up.