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Originally Posted by KenWittlief
Try it on ANY bot - feedback is the most powerful tool an engineer has at their disposal - see them F111s flying around, they would be completely unstable, unable to fly AT ALL without fly-by-wire closed loop feedback controlling its motion. And guess what? the same type of yaw rate sensors they use are available to you in the suppliers catalogs.
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I believe you meant the F-117, a small diamond shaped, stealth bomber with no conventional tail developed in the 80's, not the F-111, a large swingwing conventional bomber from the 60's and 70's.
Regardless, I agree with Gary, castors will always align with one direction and this requires them to turn and through your robot off course. A feedback system could align it in the end, but it will take time and the robot wont be in the same place you expected it.