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Focke-Achgelis Fa-330 "Bachstelze"

Louis

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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 WW2 to allow a lookout to see farther.-

Because of their low profile in the water, the submarines could not see more than a few miles over the ocean. To solve this, the German admiralty considered a number of different options, including a folding seaplane (Arado Ar 231).-

In the end, they chose the FA 330, a simple, single-seater autogyro kite with a three-bladed rotor. The FA 330 could be deployed to the deck of the submarine by two people and was tethered to the U-boat via a 150 m (500 ft) cable.-

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The airflow on the rotors as the boat motored along on the surface would spin them up. The kite would then be deployed behind the U-boat with its observer/pilot aboard, raising him approximately 120 m above the surface where he could see much farther; 25 nautical miles (46 km) compared to the 5 nautical miles (9 km) visible from the conning tower of the U-boat.-
 
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