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The German engineer Alois Riedly had filed a patent (N°709077) in 1937 for a helicopter
using two pairs of intersecting rotors, the two pairs fitted with different rotor shaft angles.
Riedl later worked for the Henschel Flugzeugwerke and maybe a project for a helicopter
with intersecting rotors was actually started there (possible designation P.77), but not
proceeded with.
(From "Helicopters Of The Third Reich" by Steve Coates)
using two pairs of intersecting rotors, the two pairs fitted with different rotor shaft angles.
Riedl later worked for the Henschel Flugzeugwerke and maybe a project for a helicopter
with intersecting rotors was actually started there (possible designation P.77), but not
proceeded with.
(From "Helicopters Of The Third Reich" by Steve Coates)