There is a story (probably untrue) of some gyro's for an anti-submarine helicopter being spun-up, and then loaded (well secured) in the back of a pickup..
Driver could only turn one way, and ended up on two-wheels!![]()
Thank you John Gummer, try it out on your daughter firstYou don't even need a metal rail ....
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While I certainly appreciate the inginuity, the practical reality shows why more of these are not in existence.