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Flettner was an early rotary-wing pioneer in Germany, he developed a torqueless rotor by powering it with small engines fixed directly to the blades driving propellers. this arrangement drove the rotor without transmitting torque (other than bearing friction) to the fuselage.
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A successful tethered flight was carried out in 1932, but the aircraft was destroyed soon afterwards when it overturned in a gale.
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air-cooled radial piston engine, 22 kW (30 hp) each
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