Focke-Achgelis Fa 330
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Original source: : Own picture

The Focke-Achgelis FA 330 Bachstelze was a type of rotary-wing kite known as a gyroglider or rotor kite. They were towed behind German U-boats during World War II to allow a lookout to see farther.

The Focke-Achgelis FA 330 Bachstelze (English: Wagtail) was a type of rotary-wing kite, known as a gyroglider or rotor kite.1

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