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An intermeshing-rotor helicopter (or synchropter) is a helicopter with a set of two main rotors turning in opposite directions, with each rotor mast mounted with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding.
K-1200 operated by Timberline Helicopters. In 1947, the German aeronautical engineer Anton Flettner was brought to the United States as part of Operation Paperclip. [2] He was the developer of the two earlier synchropter designs from Germany during the Second World War: the Flettner Fl 265 which pioneered the synchropter layout, and the slightly later Flettner Fl 282 Kolibri ("Hummingbird ...
The Kaman HH-43 Huskie is a helicopter developed and produced by the American rotorcraft manufacturer Kaman Aircraft. [2] It is perhaps most distinctive for its use of twin intermeshing rotors, having been largely designed by the German aeronautical engineer Anton Flettner.
The Fl 282 Kolibri was an improved version of the Flettner Fl 265 announced in July 1940, which pioneered the same intermeshing rotor configuration that the Kolibri used. It had a 7.7 litre displacement, seven-cylinder Siemens-Halske Sh 14 radial engine of 110–120 kW (150–160 hp) mounted in the center of the fuselage, with a transmission mounted on the front of the engine from which a ...
In contrast to the Fl 185, the Fl 265, believed to be the pioneering example of a synchropter, had two intermeshing rotors 12 m in diameter, powered by a 160 hp (119 kW) BMW-Bramo Sh 14 A radial engine in the nose of the fuselage, fitted with a fan to assist cooling.
The K-125 was Charles Kaman's first helicopter, which utilized intermeshing rotors and Kaman's patented servo-flap stability control. [1] The K-125 first flew on 15 January 1947. The K-190 and K-225 were an improved versions of the K-125, which first flew in April and July 1949 respectively.
Doblhoff WNF 342 (Tip-jet helicopter) Flettner Fl 265 (twin rotor liaison-observation helicopter, pioneer of synchropter configuration) Flettner Fl 282A/B "Kolibri" (reconnaissance synchropter) Flettner Fl 339 (reconnaissance helicopter / artillery spotter) Focke-Achgelis Fa 223 "Drache" - military transport helicopter, saw limited use for rescue
Kamov was founded by Nikolai Ilyich Kamov, who started building his first rotary-winged aircraft in 1929, together with N. K. Skrzhinskii.Up to 1940, the year of Kamov plant establishment, they created many autogyros, including the TsAGI A-7-3, the only armed autogyro to see (limited) combat action.