Yakovlev EG
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The Yakovlev EG (Eksperimentalnyi Gelikopter), most commonly known as the Yak-M11FR-1, was an experimental aircraft with coaxil rotors. The first Yakovlev prototype was assisted by Kamov and was tested in 1947 to 1948.
Design and development
The aircraft contained a side-by-side cockpit, tricycle-type landing gear, and a tailskid behind a tailplane with twin fins. The fuel tank was under the main gearbox while the oil tank was next to the engine. A fabric was added on rear fuselage of later prototypes to provide better stability in cruising flight. One prototype, designated Yak-Sh, proved that the tailskid and the tail structure itself caused problems in control. Because of this, the tail was reconfigured and the tailskid was removed. The tail was eventually an open frame without a tailplane. After this reconfiguration, the Sh had better control while hovering and flying at low speed. But in the progress of exceeding a higher speed of 30km/h, vibrations soon occured in the fuselage and control was lost once again.
The Yak-EG design was dropped in 1948, not only because of problems with prototypes, but also because of the Mil Mi-1 proving to be a better light helicopter design for the Soviate Union. [1]
Specifications
Engine: 140hp, M-11FR-1 5-cylinder air-cooled piston engine Rotor diameter: 10.0m Length: 6.53m Take-off weight: 1020kg empty weight: 878kg Payload: 142kg Fuel: 50kg Max speed at sea level: 150km/h Max speed reached: 70km/h Hovering ceiling: 250m Service ceiling: 2700m Service ceiling reached: 180m Range: 235km
See also
Related development
References
External links
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