1922 helicopter prototype. Possibly an early Pescara helicopter.
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Previously:
https://www.homemadetools.net/forum/...797#post129117
https://www.homemadetools.net/forum/...677#post132967
https://www.homemadetools.net/forum/...486#post104356
https://www.homemadetools.net/forum/...189#post112743
https://www.homemadetools.net/forum/...3557#post78292