Yakovlev EG

Yakovlev EG / Sh / Yak-M11FR-1
Role	Experimental helicopter
Manufacturer	Yakovlev
First flight	1947
Number built	1

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.[1]

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.[1]

Flight testing revealed vibration at forward speeds above 20–30 km/h (12–19 mph; 11–16 kn) In an effort to reduce vibration the tailplane and fins were removed.[1]

In early 1948 the M-11FR engine was replaced by a 190 hp (140 kW) M-12, which proved troublesome so an M-11FR was refitted to complete the flight trials by 8 July 1948.[1]

Specifications

Data from OKB Yakovlev[1], Yakovlev aircraft since 1924[2]

General characteristics

Crew: 2
Capacity: 142 kg (313 lb) payload
Length: 6.53 m (21 ft 5 in) fuselage
Empty weight: 878 kg (1,936 lb)
Gross weight: 1,020 kg (2,249 lb)
Fuel capacity: 50 kg (110 lb) fuel
Powerplant: 1 × Shvetsov M-11FR-1 5-cylinder air-cooled radial piston engine, 100 kW (140 hp)
Main rotor diameter: 2× 10 m (32 ft 10 in)
Main rotor area: 157.1 m² (1,691 sq ft) co-axial rotors

Performance

Maximum speed: 150 km/h (93 mph, 81 kn) at sea level (design)
Range: 235 km (146 mi, 127 nmi)
Service ceiling: 2,700 m (8,900 ft) (design)

Hover ceiling: 250 m (820 ft)
Rate of climb: 3.1 m/s (610 ft/min)

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References

Gordon, Yefim; Dmitry; Sergey Komissarov (2005). OKB Yakovlev. Hinkley: Midland Publishing. pp. 349-350. ISBN 1-85780-203-9.
Gordon, Yefim; Gunston, Bill (1997). Yakovlev aircraft since 1924 (1. publ. ed.). London: Putnam. pp. 123-126. ISBN 0851778720.

Yakovlev aircraft
Early aircraft	AIR-1 AIR-2 AIR-3 AIR-4 AIR-5 AIR-6 AIR-7 AIR-8 AIR-9 AIR-10 AIR-11 AIR-12 AIR-14 AIR-15 AIR-16 AIR-17 AIR-18 Ya-19 Ya-20 Ya-21 Ya-22
Fighters	Yak-1 Yak-3 Yak-7 Yak-9 Yak-15 Yak-17 Yak-23 Yak-25 (II) Yak-28 Yak-38
Bombers	Yak-2 Yak-4 Yak-28 Yak-35
Transport and passenger	Yak-6 Yak-10 Yak-12 Yak-14 Yak-18T Yak-40 Yak-42 Yak-58 Yak-112 Yak-242 (MC-21)
Reconnaissance	Yak-25 Yak-27 Pchela
Helicopter	Yak-24 Yak-100
Trainers	UT-1 UT-2 Yak-7 Yak-11 Yak-17 Yak-18 Yak-20 Yak-21 Yak-28 Yak-30 (II) Yak-32 Yak-50 (II) Yak-52 Yak-53 Yak-54 Yak-55 Yak-130 Yak-152 Yak-200 Yak-210
Experimental	EG Yak-5 Yak-8 Yak-13 Yak-16 Yak-19 Yak-25 (I) Yak-26 Yak-30 (I) Yak-36 Yak-41 Yak-43 Yak-44 Yak-45 Yak-46 Yak-50 (I) Yak-60 Yak-140 Yak-141 Yak-1000

Yakovlev EG

Design and development

Specifications

See also

References

Further reading