YAK 55-M

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the Yakovlev Yak-55, was a single-engined all-metal cantilever monoplane. The aircraft's wing is mounted mid-way up the fuselage and is of thick, symmetrical section to aid inverted flight. The powerplant is a tractor configuration 360 horsepower (270 kW) Vedeneyev M14P engine driving a two-bladed V-530TA-D35 propeller, while the aircraft has a fixed undercarriage with titanium sprung main gear and tailwheel. The prototype Yak-55 first flew in May 1981 and was unveiled at the Moscow Tushino air show in August 1982, and was displayed (but did not compete) at the 1982 World Aerobatic Championships. By this time, fashions in aerobatic flying had changed, with the high energy aerobatics demonstrated by the Yak-50 back in fashion, leading to the Yak-55 being rejected by the Soviet team. The Yak-55 was therefore redesigned, with new wings, with shorter span, reduced area and a thinner but still symmetrical aerofoil section, giving an increased rate of roll and speed.Series production finally began in 1985 at Arsenyev, with 108 aircraft being delivered by 1991. The Soviet aerobatic team first used the aircraft in 1984 when they won the World Aerobatic Championship. That same year the Soviet woman's aerobatic team took first place flying the Yak-55, Kh. Makagonova winning individual gold. General characteristics Crew: 1 Length: 7.29 m (23 ft 11 in) Wingspan: 8.10 m (26 ft 7 in) Height: 2.80 m (9 ft 2 in) Wing area: 12.8 m2 (138 sq ft) Aspect ratio: 5.13 Gross weight: 855 kg (1,885 lb) for aerobatics Max takeoff weight: 975 kg (2,150 lb) for ferry flight Powerplant: 1 × Vedeneyev M14P 9-cylinder radial engine, 268.5 kW (360.1 hp) Performance Maximum speed: 305 km/h (190 mph; 165 kn) Stall speed: 100 km/h (62 mph; 54 kn) Never exceed speed: 450 km/h (280 mph; 243 kn) Ferry range: 705 km (438 mi; 381 nmi) g limits: +9, -6 Roll rate: 345 degrees per second Rate of climb: 15.5 m/s (3,050 ft/min) In the late 1980s, work began on a revised version of the Yak-55, the Yak-55M, to meet demands from DOSAAF for an aircraft with further increased rates of roll, and to compete with new designs from the Sukhoi design bureau. The Yak-55M had a still smaller wing, which resulted in the required improvement in roll-rate. It first flew in May 1989, entering production in 1990. 106 Yak-55Ms had been built by the end of 1993, with low rate production continuing.