Translated automatically from the French version of Kelclinic. Contact us for remarks, questions or help.
russian English French German italian spanish
Yak-4
other
Yak-4

Yakovlev Yak-4

 

Yak-4 a Soviet intelligence light bomber.

"The product №23» with engines M-105 very similar to a similar "product №22». Experts from the Yakovlev Design Bureau believed that the plane with the presence of a more powerful engine is able to develop a speed of more than 625 km / h. Later found a real speed, but interest in high speed is not lost. In March, the plant 40 №1 completed work on redoing production aircraft in the new version of BB-22bis (later renamed Yak-4). By outward appearances, he is practically no different from the bomber BB-22. He had only a few differences. Engineers lengthened exhaust pipes appeared fender metal plates that protected the plywood sheathing.

It should be noted and other features of the air unit. For example, on it for the first time we tried the additional eight-oil cooler mounted on the inside of the nacelle and the variable pitch screws VISH-22E.

Yak-4

In May this year, the factory tests were completed. The results, though not spectacular, but they were very close. The flight speed of the aircraft near the ground was 460 km / h, the second high-altitude border - 574 km / h. In contrast to the basic model of the time taken to climb in 5000 m, declined to 5 45 minutes seconds. It should be noted that the domestic car is slightly larger than a German fighter Bf-109E in terms of speed in the calculated altitude.

Serial production of reconnaissance bomber BB-22bis started in October of the same year the factory №81. Serial devices pretty much different from the prototype. Each nacelle were equipped with one-fired, oil cooler segment, placed in the "beard". When you exit the tunnel radiator BB-22bis installed sash, which allows the temperature of the oil during the flight. Another interesting fact is that the installation of the navigator of movable type TSS-1 ShKAS with a machine gun was the same type.

Also, this model is equipped with a bomber variable pitch propellers, 22E, not as the BB-22, dvuhshazhnymi propellers-2K. It's good for fuel economy. As planned to create a long-range bomber, initially thought about how to extend his time for the flight to the target and back. To do this, the only solution revealed hanging stolitrovyh tanks. Total capacity was 960 l. Accordingly, increased and range - 1100 km. Serial airplane BB-22bis at maximum speed reached a point 533 km / h.

NCAP ordered to rename the bomber BB-22bis in Yak-4. It was almost one period to the first flight Pe-2. In the same year 1940 began public testing. That they like the Yak-4, and Yakovlev have problems started. Pe-2 far superior to the bomber, and almost all the important parameters.

Yak-4

January 31 1941, the plant №81 was built more than fifty copies of the series, but only three overflew. Most of them had some defects with-rotor, which in turn made it impossible to raise the aircraft into the sky.

By order of the government in February 11 41, the mass production of Yak-4 stopped. By the time the plant had №81 construct machines Yak 28-2 and 57 machines Yak-4. Yak-4 because of the large number decided to bring up the flight status and sent to the flight of the Soviet Air Force. And thanks to the joint order of the Head of State and People's Commissar of the Air Force has built Yak 33-4. When the Second World War, these planes were divided between two shelves ATM and sent to the front. Almost immediately it was replaced by a more promising Pe-2.

Yak-4 characteristics:



Modification Yak-4
Wingspan, m 14.00
Length m 10.18
Height, m  
Wing area, m2 29.40
Weight, kg  
empty aircraft 4000
normal takeoff 5845
engine's type 2-105 PD M
Power, hp X 2 1100
Maximum speed km / h 574
Cruising speed, km / h 545
Practical range, km 960-1200
Rate of climb, m / min 920
Practical ceiling, m 9500-10000
Crew 2
Armament: two or three 7.62-mm machine gun ShKAS
400-800 kg bombs

 

Aircraft

Comments

CAPTCHA
This question is to determine whether you are a human automated spam submissions.

I fully support the view that the plane did not particularly successful. Yet this machine was created by Yakovlev, and it means a lot. Designers simply just not thought through to the end of construction as the fuselage and tyagovooruzhonnosti. Especially at a rather difficult time, it was difficult, in the absence of normal financing and short deadlines machine.

The creation of a twin-engine bomber OKB A. Yakovleva do in 1938, when military experts came to the conclusion about the inevitability of the coming hostilities. Taking a starting point in the design of the BB (short-range bomber) minimize the size and weight, it is uncharacteristic for this type of aircraft, engineers have made a fatal mistake, which could not be corrected in the future any constructional or technological modifications. It was planned that the new aircraft will replace the slow-moving and obsolescent its massive bomber SB. But due to the small size of the Yak-4 opportunity to redesign it was extremely limited. Properties of the crew and the bomb bay caused an invalid offset alignment to the tail of the aircraft, which significantly worsened the stability. Insufficient supply of fuel would not achieve an acceptable range for the bomber. Despite such shortcomings, it has begun production of the aircraft. There were two versions, with the end of 1940 Get your own name - Yak and Yak-2-4. "Quartet" in comparison with "two" was the engine of increased power (M-105) and, consequently, higher speed and weight characteristics, and increased range. Lengthening the fuselage made it possible to double the bomb load. However, the very idea of ​​Yakovlevskoye is not saved - Yak indexes «2» and «4» have remained unsuccessful "breakdown of the pen" by the famous designer.

I believe that the aircraft Yakovlev success bad enough. But he flew, but virtually all the benefits and end. If the prototype still had a better performance, the production models were not always of good quality. Even despite the fact that he had two egos engine load and speed were low, and it is known is not the last parameters for the aircraft of this class. Is not it strange that this model produced a short period of time, and their combat employment did not last long due to the fact that they were easy targets for the enemy.

Pages

upstairs