Yakovlev EG

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Yakovlev EG / Sh / Yak-M11FR-1
Role Experimental helicopter
Manufacturer Yakovlev
First flight 1947
Introduction 1947
Retired 1948
Status Cancelled

The Yakovlev EG (Eksperimentalnyi Gelikopter), also commonly known as the Yak-M11FR-1 and Sh (Shootka), was an experimental aircraft with coaxial rotors. The prototype was first flown by V.V. Tezavrovsky in December 1947.

Design and development[edit]

The fuselage of the EG was a welded steel tube truss with duralumin skinning on the fwd fuselage back to the rear of the engine compartment. The rear fuselage was fabric covered and supported a tailplane style with twin end-plate fins, as well as a tailskid. The Pilot and Passenger sat side by side under a glazed canopy with a car style door on each side. The M-11FR engine was mounted behind the gearbox which it drove via a short shaft. The gear box supported the Rotor pylon which had two, contra-rotating, co-axial, two-bladed rotors. A fixed tri-cycle undercarriage mounted on steel tube trusses supported the helicopter on the ground. Flight testing revealed vibration at forward spees above 20–30 km/h. In an effort to reduce vibration the tailplane and fins were removed. In early 1948 the M-11FR engine was replaced by an M-12, which proved troublesome so an M-11FR was refitted to complete the flight trials by 8 July 1948.

Specifications[edit]

  • Engine: 140 hp, M-11FR-1 5-cylinder air-cooled piston engine
  • Rotor diameter: 10.0m
  • Length: 6.53m *Take-off weight: 1020 kg
  • Empty weight: 878 kg
  • Payload: 142 kg
  • Fuel: 50 kg
  • Max speed at sea level: 150 km/h
  • Max speed reached: 70 km/h
  • Hovering ceiling: 250m
  • Service ceiling: 2700m
  • Service ceiling reached: 180m
  • Range: 235 km

See also[edit]

Related development

References[edit]

Yefim Gordon, Dmitry Komissarov & Sergey Komissarov "OKB Yakovlev" 2005

Bill Gunston & Yefim Gordon "Yakovlev Aircraft since 1924", 1997

Bill Gunston "The Osprey Encyclopedia of Russian Aircraft", 2000