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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.

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

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

Performance


See also


Related development


References


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

Further reading




На других языках


[de] Jakowlew EG

Die Jakowlew EG (russisch Яковлев ЭГ) war ein sowjetischer Versuchshubschrauber des Konstruktionsbüros Jakowlew.
- [en] Yakovlev EG

[ru] ЭГ

ЭГ — экспериментальный геликоптер ОКБ Яковлева. Экспериментальный образец с соосной схемой лопастей. В разработке принимали участие специалисты ОКБ Камова. Испытания проходили с 1947 по 1948 год.



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