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Old 5th November 2008 | 13:01
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forget
 
Joined: Jul 1999
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From: 58-33N. 00-18W. Peterborough UK
In 1939, Flettner's Fl-265 synchropter flew successfully and was the first helicopter to demonstrate transition into autorotation and then back again into powered flight.

A History of Helicopter Flight

Now get back to work.
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