OT:
"Frank Whittle invented the Jet engine"
Hans von Ohain invented the jet engine. (patented 1936)
Ernst Heinkel built the first jet He 178 to fly in August 1939.
https://en.wikipedia.org/wiki/Heinkel_He_178
BTW they had some interesting helicopters as well:
https://www.defensemedianetwork.com/...stelze-at-war/