Flettner Fl 185
|Flettner Fl 185|
Design and development
This aircraft was developed in 1936 with support of the Kriegsmarine. It was powered by a 160 horsepower (120 kW) BMW-Bramo Sh 14 A radial piston engine with forced-air cooling, mounted at the nose. The engine drove a 12 m diameter main rotor and two auxiliary propellers mounted on outriggers attached to the fuselage.
At take-off or when hovering, the auxiliary propellers worked in opposition to each other and served to cancel the torque of the main rotor, a function handled by a single, variable-pitch tail rotor on contemporary helicopters. In forward flight, however, both propellers worked to provide forward thrust while the rotor autorotated, as in a twin-engined autogyro. The landing gear consisted of a nose-wheel, two smaller stabilising wheels under the outriggers and a tail skid. Only one prototype was constructed.
Specifications (Fl 185)
Data from 
- Powerplant: 1 × Bramo 314C 7-cyl air-cooled radial piston engine, 110 kW (150 hp)
- Main rotor diameter: 1 3-bladed× 12 m (39 ft 4 in)
- Main rotor area: 113.112 m2 (1,217.53 sq ft)
- Propellers: 2 x 2 bladed-bladed fixed-pitch wooden propellers
- "Flettner Fl 185". Retrieved 20 December 2012.
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