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Comment Re:store and release energy? (Score 1) 315

If these device will accelerate to and beyond the average velocity of the volume of gas it sits in, what prevents it from accelerating from a dead stop in a still volume of air?

This really sounds like a perpetual motion scheme.

If there's no wind then it won't move. You are missing that it will accelerate to and beyond the average velocity of the volume of gas it sits in _with respect to the ground_. The ground doesn't move with the wind.

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