The Flettner Fl 265 was an experimental helicopter designed by Anton Flettner. == Design and development == This helicopter, developed in 1938 with the support of Nazi Germany's Kriegsmarine, made it possible, for the first time, to transition from powered rotary-wing flight to autorotation and back again, making it the safest helicopter of its time.
The Flettner Fl 265 was an experimental helicopter designed by Anton Flettner. == Design and development == This helicopter, developed in 1938 with the support of Nazi Germany's Kriegsmarine, made it possible, for the first time, to transition from powered rotary-wing flight to autorotation and back again, making it the safest helicopter of its time.
Source: Wikipedia "Flettner Fl 265" · CC BY-SA 4.0
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