Difference between revisions of "Helicopter"
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+ | [[David, 1919, Aircraft]], p. 25: | ||
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+ | <blockquote>The helicopter is a machine which theorists of that school believe can fly straight up into the sky byecause its air screw propeller works on a vertical axis. This type of aircraft has never been successful, for the reason that the propeller does not lift. It simply pulls a stream-lined surface through the air. The lifting must be done by planes.</blockquote> | ||
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=== Early history === | === Early history === | ||
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{{Techtype | {{Techtype | ||
|Enclosing categories=aircraft; propulsion | |Enclosing categories=aircraft; propulsion | ||
+ | |Affiliated concepts=propeller; USPC 244/17.11; CPC B64C27/00; CPC B64C29/00; CPC G05D1/0858 | ||
}} | }} |
Revision as of 10:10, 24 May 2018
David, 1919, Aircraft, p. 25:
The helicopter is a machine which theorists of that school believe can fly straight up into the sky byecause its air screw propeller works on a vertical axis. This type of aircraft has never been successful, for the reason that the propeller does not lift. It simply pulls a stream-lined surface through the air. The lifting must be done by planes.
Early history
Gibbs-Smith, Aviation, 1970, p. 16:
The model helicopter—in use certainly since the 14th century as a toy—has recently been claimed by the Russian authorities to have been revived in 1754 with a twin contra-rotating rotor model operated by clockwork, made by the well-known scientist Michael Vasilyevitch Lomonosov, which is said to have flown successfully: but we have no documents. In 1768 the French mathematician, A. J. P. Paucton, in his Théorie de la Vis Archimède, suggested a man-carrying and man-powered helicopter with two helical screws (ptérophores), one to sustain it and the other to propel it: it was never built . But, oddly enough, this must rank was the first specific suggestion for horizontal aerial propulsion by an airscrew.
Enclosing categories | Aircraft, Propulsion |
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