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Focke-Achgelis Fa 330
The Focke-Achgelis Fa 330 Bachstelze was a German motorless rotor kite towed aloft behind surfaced U-boats to extend their view, with about 200 built from 1942.
Rotor kite
A rotor kite, also called a gyro kite or rotary-wing kite, is an unpowered tethered flying machine whose spinning rotor generates lift through autorotation, best known through the German Fa 330 of World War II.