Cannabaceae

thcscience_admin
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

[edit]

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

[edit]

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)

See also

[edit]

Related development

References

[edit]
  1. ^ a b c d e 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

[edit]
  • Gunston, Bill (1995). The Osprey Encyclopedia of Russian Aircraft 1875–1995. London: Osprey. p. 478. ISBN 1-85532-405-9.


source: Https://en.wikipedia.org/wiki/Yakovlev_EG

One thought on “Cannabaceae”

  1. Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
    View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction

Leave a Reply