NASA's Vertol VZ-2 V/STOL research aircraft built in the late 1950s.
https://s3-us-west-1.amazonaws.com/h...l_aircraft.jpg
Previously:
https://www.homemadetools.net/forum/...637#post102089
https://www.homemadetools.net/forum/...167#post149737
https://www.homemadetools.net/forum/...092#post157384
https://www.homemadetools.net/forum/...176#post138386
https://www.homemadetools.net/forum/...793#post159890
