The Platt-LePage XR-1A was an early experimental transverse rotor helicopter developed for the United States Army Air Forces in the early 1940s.
https://diqn32j8nouaz.cloudfront.net...helicopter.jpg
2:15 video:
https://www.youtube.com/watch?v=SEKIKI6-7NM
Previously:
https://www.homemadetools.net/forum/...637#post102089
https://www.homemadetools.net/forum/...793#post159890
https://www.homemadetools.net/forum/...690#post159457
https://www.homemadetools.net/forum/...176#post138386
https://www.homemadetools.net/forum/...617#post159170
