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.
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.
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.
|Wing area, m2||29.40|
|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|
|Armament:||two or three 7.62-mm machine gun ShKAS|
|400-800 kg bombs|
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