Yakovlev EG
| Jakowlew EG (Sch) | |
|---|---|
| Type: | Experimental helicopter |
| Design country: | |
| Manufacturer: | |
| First flight: |
December 20, 1947 |
| Commissioning: |
- |
| Production time: |
1946/47 |
| Number of pieces: |
1 prototype |
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The Jakowlew EG ( Russian Яковлев ЭГ ) was a Soviet test helicopter of the design office Jakowlew .
history
In order to catch up with the Soviet Union's deficit in the field of helicopter technology, design offices with little experience in this field were also commissioned to submit projects for two- to three-seat helicopters by the end of 1947, including the Yakovlev design office. Alexander Jakowlew therefore instructed on March 18, 1946 to form his own construction brigade under the direction of S. Bemow. A type or factory designation was not assigned, the official name of the project was Eksperimentalny Gelikoptr (experimental helicopter), or EG for short. Unofficially, the name product Scha (Изделие Ш) was used, with the Russian letter Scha as an abbreviation for Schutka (joke).
The motor M-12 should serve as the drive. Ultimately, the weaker pre-war model M-11FR-1 had to be used. The first prototype was completed in spring 1947. The ground test began on August 2, 1947, the first flight took place on December 20. The machine showed good flight characteristics, but was difficult to control in the steady state. By July 8, 1948, 115 flights had taken place, some of which had to be canceled due to frequent defects. A maximum speed of only about 70 km / h (calculated were 150 km / h), a summit height of 2700 meters and a range of 235 km were achieved. A second copy was no longer completed because the project was discontinued in favor of the Mi-1 . The prototype came to the MAI as a study object and was eventually converted into a snowmobile .
construction
The EG was equipped with coaxial rotors with two blades each. The rotors were about ten meters in diameter, the blades were made of wood and stiffened with steel spars. It had a relatively long boom, which ensured sufficient flight stability. Disc-shaped stabilizing surfaces that were initially still on the boom turned out to be superfluous and were removed. The two-seater cabin was generously glazed with a door on each side. The tripod landing gear was rigid and pneumatically dampened. The EG weighed 878 kilograms empty.
Technical specifications
| Parameter | Data |
|---|---|
| Rotor circle diameter | 9.80 m |
| length | 7.42 m |
| height | 3.40 m |
| Empty mass | 878 kg |
| Takeoff mass | 1020 kg |
| drive | an M-11FR with 118 kW (160 PS) |
| Top speed | projects 150 km / h practically 70 km / h |
| Service ceiling | 2700 m |
| Range | 238 km |
literature
- Gennady Petrov: Stable lateral position . In: Aviation Classics . No. 2/2014 , p. 58/59 .
- Wilfried Bergholz: Jakowlew since 1927 . Motorbuch, Stuttgart 2017, ISBN 978-3-613-04024-3 , p. 96/97 .
- Wilfried Bergholz: Russia's great aircraft manufacturer . Jakowlew, Mikojan / Gurewitsch, Suchoj. The complete type book. Aviatic, Oberhaching 2002, ISBN 3-925505-73-3 , p. 65 .