YAK 55-M

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The Yakovlev Yak-55 is a single-engined all-metal cantilever monoplane with a mid-positioned wing that features a thick, symmetrical section for enhanced inverted flight capability. The aircraft's powerplant consists of a 360 horsepower (270 kW) Vedeneyev M14P engine, which drives a two-bladed V-530TA-D35 propeller and is housed in a tractor configuration. It has a fixed undercarriage with titanium sprung main gear and tailwheel for stability. The prototype of this aircraft took to the skies for the first time in May 1981, and it was publicly displayed at the Moscow Tushino air show in August 1982. However, it did not compete at the 1982 World Aerobatic Championships. The Soviet aerobatic team started using this aircraft in 1984, which led them to secure victory at the World Aerobatic Championship that year. The Soviet women's aerobatic team also triumphed during the same period, with Kh. Makagonova earning an individual gold medal. The key specifications of the Yak-55 include a crew of one, a length of 7.29 meters (23 ft 11 in), a wingspan of 8.10 meters (26 ft 7 in), and a height of 2.80 meters (9 ft 2 in). Its wing area measures 12.8 square meters (138 sq ft) with an aspect ratio of 5.13. The gross weight of the aircraft for aerobatic purposes is 855 kg (1,885 lb), while its maximum takeoff weight during ferry flights is 975 kg (2,150 lb). The Yak-55 can reach a maximum speed of 305 km/h (190 mph; 165 kn) and has a stall speed of 100 km/h (62 mph; 54 kn). Its never exceed speed is 450 km/h (280 mph; 243 kn), while its ferry range extends up to 705 km (438 mi; 381 nmi). The aircraft can perform at a rate of +9 G-forces and -6 G-forces, with a roll rate of 345 degrees per second and a rate of climb of 15.5 meters/second (3,050 ft/min). In the late 1980s, the Yak-55M emerged as an improved version of the original design, built to fulfill DOSAAF's demands for an aircraft with even higher roll rates. The Yak-55M features a smaller wing, which results in enhanced roll-rate capabilities. First flown in May 1989 and entering production in 1990, 106 Yak-55Ms were built by the end of 1993, with low-rate production continuing.