who proposed the helicopter model
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7
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l think, Sikorsky proposed the helicopter model
hope it helps
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3
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Sikorsky
SikorskyOn June 27, 1931, Sikorsky submitted a patent application (no. 1,994,488) for a direct lift aircraft, which included all the major engineering features of the VS-300. The patent was granted on March 19, 1935.
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