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The Son Of The Practical Helicopter's Inventor Just Passed, Here's How Sikorsky Changed Aviation Forever
The hundreds of failed helicopter inventions had either inadequate power or control or experienced excessive vibration. Some of the better-designed early helicopters managed to hop briefly into the ...
Mandel Lenkowsky Early Vertical Flight Development Collection / Series 1: Correspondence and Manuscript Notes Material is subject to Smithsonian Terms of Use. Should ...
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