Yakovlev EG
| 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
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 unit with twin endplate 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 gearbox supported the Rotor pylon which had two, contra-rotating, co-axial, two-bladed rotors. A fixed tricycle undercarriage mounted on steel tube trusses supported the helicopter on the ground. Flight testing revealed vibration at forward speeds 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
- Engine: 140 hp, M-11FR-1 five-cylinder air-cooled piston engine
- Rotor diameter: 10.0m
- Length: 6.53m
- Takeoff 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
Related development
References
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