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Aviation History
1958
1958 - 0375.PDF
FLIGHT, 21 March 1958 391 coupled to a common gearbox providedwith clutches and free-wheels giving a final shaft drive to the hub of the rotor.Photographs show what appear to be an intake for the oil coolers between the mainengine intakes; bifurcated outlets for the out-turned exhaust trunks; and an intakeserving the gearbox oil coolers. All this indicates that the Mi-6 is iden-tical in configuration with the Westland Westminster (two Napier Elands); but itis rather larger than the British machine and it is also many months earlier in tim-ing. It is a very remarkable achievement to have designed, developed and flown theMi-6 and to have brought it to a state of development where it can gain a worldrecord under observed conditions. The previous load-to-height record was 6,010kg (13,250 lb) which a Sikorsky S-56 lifted to 6,560ft. On October 30 the Mi-6 flewto 7,874ft with a commercial load of 12,004 kg (26,464 lb). An accompanying Sovietannouncement stated that the Mi-6 can carry 70 to 80 passengers as well as heavyequipment and vehicles; it was claimed that series production was "about to start." Winicki Undesignated Helicopter Powered by a260 h.p. AT-14 engine, this helicopter is shown in an accompanying photograph (possibly of a model). • Rotor diam., 36ft; empty weight, 1,785 lb;gross weight, 2,865 lb; max. speed, 93 m.p.h.; cruising speed, 71 m.p.h.; range, 215 miles;hovering ceiling, 3,280ft; absolute ceiling (two up), 13,750ft. Yakevlev Yak-24 (Horse) Another very impres-sive Soviet helicopter, the Yak-24 has been in service with the Soviet Air Force for atleast three years. It is powered with two 1,700 h.p. ASH-82V fourteen-cylinderradial engines driving rotors similar to those of the Mi-4. The "box-car" fuselageis of steel tube construction, the centre portion being fabric-covered and the ex-tremities having metal panelling. Com- bined with the rear section of the fuselageis a loading ramp for wheel or track vehicles and heavy military equipment.The cabin measures some 33ft in length and will accommodate two lorries or jeeps,a twin 14.5 mm anti-aircraft gun with its crew, or as many as 40 troops with theirservice equipment. During December 1955 a Yak-24 liftedtwo metric tons to a height of 16,670ft. • Rotor diam., over 56ft; gross weight, over35,000 lb: cruising speed, 110 m.p.h. approx.; range, 500 miles approx. Below left, Aerotecnica AC-21. Below and extreme right, Aerotecnica AC-14. Upper left and above, Yak-24 (Horse). SPAIN Aerotecnica, S.A. Velazquez, 38, Madrid.AC-12 This light two-seater helicopter is powered by a Lycoming O-360 engineof 170 h.p. mounted above the cabin and driving the rotor through a gearbox. Thecabin seats two side by side and there are dual controls. • Rotor diam., 27ft lOin; overall length,27ft 9in; empty weight, 1,055 lb; gross weight, 1,585 1b; max. speed, 75 m.p.h.; cruising speed,63 m.p.h.; absolute ceiling, 16,000ft. AC-14 The five-seater AC-14 is a ver-sion of the earlier AC-13 three-seater, powered by a 320 h.p. Turbomeca ArtousteII gas turbine. The accompanying photo- graph shows the aircraft with the cabinsides removed. • Rotor diam., 31ft 6in; empty weight, 1,370 lb; gross weight, 2,650 lb; max. speed, 112 m.p.h.; cruising speed, 99 m.p.h.; ceiling with ground effect at max. weight, 21,000ft.AC-15 A projected two-seater heli- copter with a Lycoming VO-435 h.p.engine of 260 h.p. AC-21 A projected helicopter havingtwo Turbomeca Turmo III engines of 750 s.h.p., an empty weight of 4,400 lb, aservice ceiling of 32,000ft, and seating twelve (including crew). Normal still-airrange will be 590 miles. Rotor diameter is 55.6ft.
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