Focke Achgelis never provided any technical support to Platt-LePage Aircraft.Juergen, thanks for the information.
Now you've got me wound up.
Mr. Glidden Doman was not a fan of Igor Sikorsky either.
This is part of a telephone conversation I had with Mr. Doman to discuss Anton Flettner and his Intermeshing helicopter:- "At an American Helicopter Society dinner meeting, where Flettner and Sikorsky were both present, Sikorsky was taken aback by the technological advancements shown in Mr. Flettner's film of the intermeshing Flettner FL-282."
Cierva's W.11 Air Horse was a tri-copter built by G & J Weir, Ltd.
Apparently it was later reconsidered by someone, but with the leading single rotor changed to a coaxial trailing rotor. = Bilateral symmetry.
The first helicopters to see quantity production and use in WWII were the Focke-Achgelis Fa 223 and the Flettner ~ FL-282. Both had bilateral symmetry.
The Platt-LePage XR-1 also had bilateral symmetry. But, as Roosevelt caused America to side with the English, the Germans slowed and then stopped providing the technical support that the Platt-LePage Aircraft Company needed to refine it's craft.
ALL European countries lost the 2nd World War; financially. The US won the bounties of war.Igor Sikorsky was the primary instigator of the American Helicopter Society.The US army stopped using the Kaman Huskie for training pilots because it was too easy to learn on.Some speculation;
Perhaps rotorcraft would be a lot more advanced today if no one had told Igor that things call 'runway' were being built and large floatplanes were dead in the water.
Historical facts can get distorted by the vortex of later self-serving propaganda. The greater the 'spin', the more the distortion.