Built by the British in the 1940s, the Cierva W.9 was an experimental helicopter that featured a no-tail-rotor (NOTAR) system.
https://diqn32j8nouaz.cloudfront.net...9_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...1_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...348#post218900
https://www.homemadetools.net/forum/...107#post214380
https://www.homemadetools.net/forum/...946#post210446
https://www.homemadetools.net/forum/...144#post141458
https://www.homemadetools.net/forum/...893#post229732
