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Yakovlev Yak-11. A photo. Characteristics.
The USSR and Czechoslovakia
Crew: Two pilots are arranged one behind the other
The concept of the Yak-11 aircraft, designed for use in the USSR Air Force as a training fighter based on the Yak-3 airframe, was first discussed in the middle of 1944. The prototype, which received the designation Yak-ZUTI (UTI - training fighter), made the first flight in 1945 year. The Yak-11 aircraft made the first flight in 12 months. He used a large number of slightly modified parts and assemblies of the Yak-3 fighter. The aircraft, equipped with a star-shaped engine of the Shnetsov ASh-21, underwent extensive flight tests and was put into serial production at 1946 year, and the first production aircraft were delivered in the middle of 1947.
It was noted only that unlike its predecessor fighter plane Yak-11 is particularly mobile, performing a "barrel". Built 3859 aircraft Yak-11 before they switched to the modification of the "U", which differed in the nose of the chassis to prepare the pilots of jet aircraft *. This modification replaced in 1958 a lot of standard aircraft Yak-11. The production of this modification was discontinued in the USSR in 1954 year, and in the same year the production of this aircraft under the designation S.11 began in Czechoslovakia company LET. It was built around 707 aircraft, which in addition to use in the Warsaw Pact countries were also exported to many communist countries.
At present, all aircraft derived from a military operation. Currently Yak-11 highly valued as a historic military planes because of their origin from the Second World War fighter. More 100 aircraft remained in a state of airworthiness around the globe, most of them - it S.11 planes. Flying copies can be found in Belgium, Great Britain, USA, France, Sweden and the Czech Republic.
The design of the Yak-11
Yak-11 designed by an all-metal, two-spar wing with a metal shell. Rudder and ailerons have a fabric covering. The front lower edge of the wing has a notch into which the damper struts wheel chassis. Cut-outs are created by the full circuit of the spar. Flaps sheathed sheet duralumin.
Fuselage metal frame consists of four 11 frames and longerons. The engine is located on the welded pipe of the farm attached to zero frames. The structure of the engine hood includes a cylindrical cover, inlet ring and gear cone. For adjustment of air flow that cools the engine, are responsible controlled blinds.
The front landing gear may retract the wing and the tail (back) is not removed. Leg chassis has a spring strut, which is placed inside the movable piston and poluvilka carrying axis while wearing the gear. Also at the wheel has a brake drum.
An obstacle for any wheel is unfolding traverse connecting rod and the spring strut. Stand with the wheel retracted into the wing. The mechanism of exhaust and intake at the expense of special cylinder. All the mechanical action on the plane, including the launch of the motor, cleaning and production of landing flaps, landing gear, braking exercise, due to take place on-board system, which consists of two cylinders with compressed air compressor and fed them.
In both wings of established 2 fuel tank capacity liters each 173. Consumables tank installed in the fuselage, its capacity - 13,5 l. The structure of the system consists of an oil tank on 35 l, oil cooler, pipes, tank suflerny, trehstrelochnye indicators and drainage tubes.
The Yak-11 installed engine AL-21 700 with traction in HP VISH 111-A-15 (propeller) is a two-bladed, with the presence of a metal machine constant speed P-7E.
In the cockpit, the student placed appliances, engine control and navigation equipment. The cockpit design, which is located behind, are the main duplicated control over the plane. For communication with the base and other aircraft responds RSIU-ZM - VHF radio.
In the entire history of aviation training aircraft Yak-11 exploited Austria, Afghanistan, Albania, Algeria, Bulgaria, Hungary, Vietnam, East Germany, Egypt, Yemen, China, North Korea, Mongolia, Poland, Romania, Syria, Somalia, Czechoslovakia, Angola and, in fact saying the USSR.
Surviving airworthiness modifications: Yak-11, LET S.11 and Yak-ZUTI
Yak-11 characteristics:
Modification Yak-11
Wingspan, m 9.20
Aircraft Length m 8.50
Height, m 3.28
Wing area, m2 15.40
empty aircraft 1854
maximum take-off 2418
Internally fuel kg 268
engine's type 1 PD Shvetsov ASH-21
Power, hp X 1 570
Maximum speed km / h 456
Cruising speed, km / h 330
Practical range, km 1290
The duration of the flight, ch.min 4.20
Practical ceiling, m 7000
Armament: one synchronized 12.7-mm machine gun UBS
two bombs from 25 to 100 kg, photo-camera gun PAH-22
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