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Yak-55
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Yak-55

Yakovlev Yak-55

 

Yak-55 1979 was developed in the year in the Yakovlev Design Bureau and represented the single aerobatic aircraft. It was designed for learning and training of pilots and performances in competitions.

 

History of the Yak-55

 

In 1976, the championship in aerobatics was held in Kiev, which culminated in the victory of Soviet pilots at the Yak-50. They demonstrated high-speed aerobatics using the permitted aerobatic zone 800x1000x900 m. Foreign partners carried out figures with small radii at low speeds in a confined space. At that time, such a short-lived style was considered more progressive. As a result, in our country, we began to develop a more advanced sports and aerobatic aircraft, which fully meets modern requirements. Applying a thicker wing profile and reducing the load on the wing, it would be possible to achieve the necessary characteristics. For Yak-55 the remote load was 50 kg / m2. Designers have developed a thick airfoil with 18 percent (against 9-14 percent of its predecessors).

Yak-55 video

 

To get the best results when performing reverse maneuvers, Yak-55 made symmetrical. All aerodynamic system was too close to full symmetry sredneplan wing is on the engine thrust vector axis, in turn, horizontal tail - almost in the wake of the wing. As for the vertical stabilizer, it is the projection of the lower fuselage. Thanks to this arrangement technique of figures has become much easier, thus improving the performance of the machine veneer.

Yak-55

The Yak-55 structure was made of metal. Unlike the Yak-50, it is very simple. The aileron occupies almost the entire trailing edge, the wing is made on a single-sparse pattern. In the root part of the wing, to the right and to the left of the fuselage, in front of the spar are made 2 geometric compartments - additional and main gasoline tanks. The wing, consisting of two detachable consoles, is attached to the fuselage, which is made as a semi-monocoque. Stabilizer and keel of the double-spar system. To make the system easier, the plumage was made integral with the fuselage. Yak-55 has a non-retractable chassis made of titanium alloy with springs. The tail wheel is steerable, the chassis wheels have mechanical brakes. The power plant is represented by the M-14P engine with the screw B-530TA-D35. The oil system is taken from Yak-50. The fuel system allows the aircraft to be upside down for up to three minutes.

 

Creating a Yak-55

 

Immediately it is worth noting that the construction of the aircraft took place long enough. The first flight in May 1981 years fulfilled Oleg Bulygin, an experienced test pilot. While our athletes effectively acted on the Yak-50. "Flourish", high-speed aerobatics considered Soviet style, which was used to 1981 pilots of all countries. In place of such a low-speed machines come miniature biplane and, of course, monoplanes of the type "Laser" (USA). The speed style began to fly pilots, who spoke on "Zlin-50L" (Czechoslovakia) and CAPAJ (France).

Yak-55

In these conditions, the aircraft, only released, became obsolete. It had rather low angular speeds of rotation, and efforts on the control knobs are too great. But, despite this, he had a lot of positive qualities: on the plane the figures of reverse pilotage were perfectly executed, he came out of various kinds of corkscrew without any difficulties. Specialists only had to "force" the Yak-55 to rotate faster around the axis and fly. For this purpose, the wing was shortened, the damping properties and the specific load decreased. In this form, the Yak-55 is capable of developing in a horizontal flight a maximum speed of up to 315 km / h and rotating over 4 radians per second.

Yak-55 video

 

Before the World Championships in aerobatics in the Yak improved year 1982-55 handed the USSR national team, but the athletes were not able to so quickly to prepare for the performances at the modernized aircraft. M. Molchanyuk, continuing tests revealed flaws in the design. As a result, Yakovlev was created and designed a new wing with a thinner profile and a high-speed large contraction. In 1984 year's World Cup and Victor Nikitiuk Nikolai Smolin, speaking at the Yak-55, were the winners in the individual exercises.

Yak-55

But most of all has been achieved Halide Makagonova, which won the title of absolute world champion. The Yak-55 easy to operate, allowing you to fly it even inexperienced pilots. At the technical staff of its service does not cause any difficulties. It was decided to mass production. Using Yak-55 in the sports club will promote the efficient development of air sports in our country.

Yak-55 cabin

Yak-55 characteristics:



Modification Yak-55
Wingspan, m 9.00
Aircraft Length m 7.29
Height, m 2.20
Wing area, m2 12.80
Weight, kg  
empty aircraft 550
maximum take-off 875
Internally fuel l 120
engine's type 1 PD M-14P
Power, hp X 1 360
Maximum speed km / h 450
Practical range, km 495
The duration of the flight, ch.min 2.00
Practical ceiling, m 4000
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Crew 1

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