1954 Kellett KH-15 Stable Mable experimental helicopter powered two hydrogen peroxide rocket engines.
https://www.youtube.com/watch?v=Czri29weziw
Previously:
https://www.homemadetools.net/forum/...901#post160165
https://www.homemadetools.net/forum/...690#post159457
https://www.homemadetools.net/forum/...170#post157685
https://www.homemadetools.net/forum/...822#post152381
https://www.homemadetools.net/forum/...219#post149989
https://www.homemadetools.net/forum/...617#post159170
https://www.homemadetools.net/forum/...176#post138386