Kellett KD-1
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Original source: Own work
Author: RuthAS

The Kellett KD-1 was a 1930s American autogyro built by the Kellett Autogiro Company. It had the distinction of being the first practical rotary-wing aircraft used by the United States Army and inaugurated the first scheduled air-mail service using a rotary-wing aircraft.

was based on the Kellett KD-1 first imported to Japan in 1938. The craft was initially developed for use as an observation platform and for artillery spotting duties.1
Ka-1 (which derived directly from the American Kellett KD-1) in both the radial- and inline-engined versions: Logged If you like odd aircraft, make sure to visit STARGAZER, my site on Burt Rutan and 2

Made by Kellett Autogiro Corporation.

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