Flettner FI.265

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The Flettner FI 265 is an experimental helicopter designed by Anton Flettner.

The helicopter was developed in 1938 with support from the German navy. Unlike the Fl 185, FL 265, considered pioneering example a synchropter had two rotors of diameter 12 m.

The radial engine provided a power of 160 (120 kW) BMW-Bramo Sh 14.

Six helicopters have been built. Mass production was reduced in favor of the Flettner Fl 282.

History : 
After the exceptional development of the helicopter Focke-Wulf FW 61, realized in Germany in the years 1931 to 1937, in which Germany wins all records for helicopters, the Luftwaffe placed an order for the development of a helicopter more capable of carrying a payload of 700 kg.

The new helicopter was developed as part of this order by Anton Flettner, expert and inventor in the field of flow technology, and colleagues.

He applied a new concept of two counter-rotating rotors, as well as rather large tail areas. For the propulsion of the rotors 14a Central HS with 150 HP output was used.

The helicopter was designated VI FI 265, TK + AN and was produced in 5 copies, who served from 1939 to 1940 as a helicopter on the cruisers of the German Kriegsmarine operating in the Baltic Sea.

She managed to further production of the easily controllable helicopter, Flettner and has since worked on an improved type of FI 282.

Specifications : 

Crew: 1
Main rotor diameter: 2 × 12.30 m (40 ft 4 1/4 in)
Main rotor speed area: 237.65 m2 (2558 ft2)
Empty weight: 800 kg (1764 lb)
Gross weight: 1,000 kg (2,205 lb)
Engine: 1 × Buramo Sh 14A air-cooled radial engine, 119 kW (160 hp)

Max speed: 160 km / h (99 mph)

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