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Kellett XR-8, 1945 - YouTube
https://www.youtube.com/watch?v=IP1Pn6F6FZs
Kellett XR-8 intermeshing rotor helicopter demonstrating rooftop mail delivery at the central Philadelphia Post Office, 1945
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WW2 German Doblhoff Jet tip Helicopter - YouTube
https://www.youtube.com/watch?v=GF9R9Zq6P9M&NR=1
A quick glimpse of the first test flights of the V2 version of Doblhoff's jet tip powered Helicopter, constructed at the Wiener Neustadter Flugzeugwerke. It ...