Yak-25, which NATO classification called "Flashlight" - Double Soviet fighter-interceptor development of the Yakovlev Design Bureau. Getting Started: 1949g.
The design of the Yak-25
The fuselage is made monocoque type has a circular cross-lining, in which the tail section becomes oval. fuselage length of 14,56 m, diameter - 1,45 m The fuselage is pressurized cabin, radar sight RP-6, fuel tanks compartment nose landing gear, main landing gear compartment, niche guns and other departments... Top located gartrot, which placed electroplaits, pipelines and various traction control systems. On the sides of the sides of the plates placed air brakes, which deviation angle - 50 °, area - 1 m².
Trapezoidal cantilever wing has a sweep angle 45 °. The structure of power elements of wing consoles includes two spar power braced girder, which was fixed swivel with the front spar, a set of ribs (36 pcs.) And stressed skin. The wing ailerons are internally compensated with wind-shields and flaps, having a fixed axis of rotation. Limit angles are flaps-flaps landing - 50 °, on the rise - 25 °. The ailerons are deflected up and down a maximum angle 25 °.
The aircraft has a swept single-fin tail. The stabilizer is centered swing keel. Horizontal tail is made of profile ACA 000010M. Sweep horizontal tail - 45 °, area - 4,66 m. The stabilizer is fixed at an angle 30 °. Elevator trim deflection angles are: down - 20 °, up - 33 °. Kiel consists of two side members, has stressed skin. Keel is made of profile-0008M ASA and ASA-0009M and has 5,33 m² area, sweep - 55 °. It is the rudder, having an axial compensation of a part of the vertical tail, and limit angles 26gradusov deviation. On the pitching ending installed radio station ZM-RSIU and exchange rate system.
Yak-25 has bicycle type landing gear with front steering wheels. Wheels front desk and non-braking underwing. The main landing gear had twin wheels, equipped with two-chamber brakes, which included machine guns to prevent skidding. Track chassis - 0,44 m base - 5,42 m rear wheel size -. 800x225, underwing - 310x135, front - 600x155 mm.
The composition of two turbojet engine RD-25A (AM 5A) powerplant Yak-5 included, the power of which is 2600 kg. They were placed in underwing nacelles. Total capacity of fuel tanks - 3445 l. In addition to the four wing, the fuselage under the setting of the suspension discharged tank capacity l 685. The aircraft can be drained in the air kerosene.
Weapons and armor protectionYak-25
Yak-25 weapons system is represented by two guns N-37L caliber H 37L. Ammunition each gun mount - 50 cartridges. Aiming performed by radiopritsela RP-6.
Lantern cockpit is made of armored glass 105 mm thick. The front cabin is a steel armored plate. The backrests and headrests and also armored pilot seats operator. The side of the seat are duralumin plate and broneschitki. The fuselage has a thick armor 10 mm.
Yak-25 equipped with radar RP-6 «Falcon", a system of blind landing OP-48 «Continent», the marker radio MCI-48P, automatic radio compass ARK-5, navigation indicators NOR-50B, artificial horizon AGI-1, remote gyromagnetic compass DGMK -5, the defendant SRO airplane, the radio station ZM-RSIU, radio altimeter RV-2, airplane intercom SPU-2R et al. devices and systems.
Yak-25 has booster aileron control system and the height of the wheel (emergency - mechanical) and mechanical rudder system. In the cockpit of the pilot-operator has a full set of controls.
|Wing area, m2||28.95|
|Maximum speed km / h||1090|
|Engines||2 TRD RD-5A|
|Thrust, kgf||X 2 2000|
|The maximum rate of climb, m / min||2640|
|Practical ceiling, m||12000|
|Fuel tanks, l:|
|Practical flight range, km||2700|
|The duration of the flight, ch.min||3.26|
|Armament:||two 37-mm gun H 37L with 50 (100) rounds per gun|
The aircraft with the designation Yak-25 1947 first appeared in the year. Its establishment was engaged in design bureau Yakovlev. Designers Design Bureau developed the first jet fighter with a straight wing design. There were created two aircraft of this series.
Test aircraft Yak-25
Draft design of this machine was approved in early February 1947 years. For factory testing only began in the middle of the autumn of the same year. The first separation from the runway YAK-25 2 carried out in November. This flight signaled the pilot and designers of high flying and maneuvering characteristics of the aircraft. In addition to the positive indicators, there were drawbacks. When you set the maximum speed of the machine started strongly shake, it was caused by uneven air flow near the surface stabilizer. This problem was solved by installing additional spoilers on the stabilizer. Due to the improvements carried Yak-25 was able to show the speed that exceeds the aircraft data Yak-23 60 to km / h.
State tests were completed in the early autumn of the year 48. The general public car was presented at the Tushino parade. Further development of the project Yak-25 device not found, due to the fact that the Government has given its preference MiG-15.
Design Features Yak-25
The beginning of production of the Yak-25 served the purchase in England of new jet engines "Derwent V» model. When used, the Yakovlev Design Bureau has designed two aircraft, which have become fighters and labeled 23 25. In turn, the design model of the Yak-25 widely used operating time with the machine Yak-19. The difference of the new aircraft was the case in the semi-monocoque scheme was changed and the engine layout.
The housing was divided into two compartments, namely the fore and aft. In the front compartment of the machine has been installed cockpit hermetic type. Place the pilot had a greater degree of protection against ingress of shells. The front of the cabin is equipped with armored plate and armored glass of great thickness. tucked in the back of the pilot armored seat. In case of emergency the pilot can rescue ejection system, which was equipped with a chair.
The wings are composed of two spars, which are located flaps gap type. The edge of the wing is equipped with holders for which it was possible to install additional fuel tanks to increase range. As for feathering, it was performed in a cruciform pattern and had a large sweep. Dvuhlonzheronnoe plumage was equipped with a keel and a rear stabilizer. Under feathering machines were installed brake flaps that opened the automatic system at certain airspeed.
Designers were laid out and armament, which had planned to establish on the Yak-25, namely, the two large-caliber gun model W-3-23 from 150 cartridges. But these devices have not been tested, and instead chose three HP-23 gun, from which you can spend on 75 volleys. All aircraft weapons were placed under the vehicle body.
With regard to navigation, it was quite perfect at the time. The aircraft was equipped with a radio RCI-6 and radio compass RPKO-10M. respondent type MF-3 was installed. All equipment and components supplied with electricity from a generator, and a stationary battery GSK on 12 volts. For flights at high altitudes has a cockpit oxygen KP-14 system capacity of two liters.
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