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Yakovlev EG

Field	Value
name	Yakovlev EG / Sh / Yak-M11FR-1
image	Yakovlev.EG.helicopter.svg
aircraft_type	Experimental helicopter
manufacturer	Yakovlev
number_built	1
first_flight	1947

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 – In an effort to reduce vibration the tailplane and fins were removed.

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

Specifications

|prime units?=met General characteristics

|max takeoff weight kg= |max takeoff weight lb= |max takeoff weight note= Powerplant

Performance

|never exceed speed kmh= |never exceed speed mph= |never exceed speed kts= |never exceed speed note=

Hover ceiling: 250 m |disk loading kg/m2= |disk loading lb/sqft= |fuel consumption kg/km= |fuel consumption lb/mi= |power/mass= |thrust/weight=

References

Gordon, Yefim. (2005). "OKB Yakovlev". Midland Publishing.
(1997). "Yakovlev aircraft since 1924". Putnam.

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

1940s-soviet-experimental-aircraft 1940s-soviet-helicopters yakovlev-aircraft coaxial-rotor-helicopters aircraft-first-flown-in-1947 single-engined-piston-helicopters

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