OK, so the plane shoves air out of the way, and that takes energy. But when the plane passes, air will fill the air tube. Is there any way in theory to recover from that air filling the air tube some of the energy that was expended in making the tube?
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OK, so the plane shoves air out of the way, and that takes energy. But when the plane passes, air will fill the air tube. Is there any way in theory to recover from that air filling the air tube some of the energy that was expended in making the tube?