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Yak-7
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Yak-7

Yakovlev Yak-7

 

Yak-7 was designed by Soviet designers and was widely used during World War II. This machine is created on the aircraft plant №301 under the direction of designer Alexander Yakovlev and engineer KV Sinel'shchikova. The new fighter was designed on the basis of already suschestvovashego training aircraft Yak-7UTI.

Brief history and design features of the machine UC-7

When you create a machine-type UTI-26 designers could not even suggest that the device will be used as the base model of the new fighter. By remaking training machines started in the early years of the war, when the Red Army suffered heavy losses among the fighters. A special feature is that this machine had time to go through only factory tests and trials, and the state and it did not pass. After the factory test flight was launched in serial production. Despite this, the car met all requirements.

Yak-7

Manufactures Yak-7 in Moscow, Khimki, where the fall was released 41 years 51 machine. In addition, production was carried out in Novosibirsk, to the end of 41-11 Jacob built. Also, fighters of this class are manufactured and factory in the city of Gorky. In 1942 2602 year it planned to create a Yak-7.

Yak-7 was very similar in appearance to the previous version of the aircraft, but differed qualitatively the best flight and combat characteristics. The advantage was that the plane had engine mount, which is easily removed, thereby to this unit can be installed another engine.

Yak-7 photo

The new fighter model Yak-7 was established quite powerful weapons, represented by large-caliber gun from which it was possible to produce 120 shots. Also adopted were two types of synchronous machine gun with ammo ShKAS 1500 pieces. Lockers were placed on six rockets, which are launched from a rocket-propelled missile RS-82.

Pilots have protection in the form of an armored seat back, which was not in previous aircraft. They were replaced by fuel tanks to tanks-sealing type. There was also converted the second cabin, which was published by the instructor in the original model. The second cabin was used as a passenger or cargo. Also here you can install an additional fuel tank. Total of serial production were manufactured units Yak 6399-7. It should be noted that all the time designers spend revision and modernization of the machine, due to which it has been allocated 18 different modifications of the fighter.

Yak-7 scheme

Advantages of the Yak-7:

  • large glass area cab, which allows to effectively perform combat maneuvers and monitor the position of the enemy;
  • quality and excellent maneuverability at low altitudes, and these figures were just some of the fighters;
  • high-speed performance;
  • firepower, which was presented to a large number of weapons at the expense of this machine is really high quality to cope with the destruction of enemy aircraft;
  • despite the fact that the plane had a piston engine, it still provides very fast climb; This machine can carry out even some aerobatics.

Yak-7

Disadvantages Yak-7

  • Despite the powerful weapons, ammo was not enough, so sometimes during the battle, our pilots were simply unarmed. Especially sharply this problem is manifested in the battles that were fought far from its airport.
  • The machine was installed armor of medium thickness, thus reducing the weight and increase the speed, but the Yak-7 become more vulnerable to enemy fire.

 

Yak-7 characteristics:



Modification Yak-7
Wingspan, m 10.00
Length m 8.50
Height, m 2.75
Wing area, m2 17.15
Weight, kg  
empty aircraft 2477
normal takeoff 2960
engine's type 1 PD M-105P
Power, hp X 1 1050
Maximum speed km / h  
near the ground 471
on high 560
Practical range, km 643
Rate of climb, m / min 735
Practical ceiling, m 9250
Crew 1
Armament: One 20-mm gun ShVAK (120 ammunition shells) and
Two 7.62-mm machine gun CABG

 

Yak-7 video

 

Yakovlev Yak-7R

Yak-7R - project interceptor fighter based on the Yak-7.

The decision to create a jet interceptor fighter produced by modifying the existing standard Yak-7 in military terms was appropriate, because allows you to build the plane in the shortest time. The decision was taken after a thorough review and analysis of six design options sketch of jet fighter-interceptor.

The aircraft had planned to use the combined power plant, which included two ramjet DM 4S design IA Merkulov and a liquid rocket engine development 1A D-LS Dushkin.

Engines DM 4S that produced maximum traction, which is located under the wing, and additional D-1A positioned in the rear fuselage. It was used for short-term set speed during takeoff and Dogon intercept air targets.

Yak-7R

As fuel DM 4S used gasoline, which comes from the wing tanks. For D-1A fuel was kerosene oxidizer - nitric acid.

The project was the aircraft layout with four wing fuel tanks (two on each wing console), two kerosene tank located behind the cab, and a reservoir for nitric acid near the kerosene tanks.

Based on the introduction of a fundamentally new power plant, spent cleaning propeller, the engine M-105PA, engine mounts, engine hood, water and oil system, etc. In-rotor Yak-7 were only four gas tank wiring, which are located in the wings.

The tail wheel with rubber pneumatics replaced by a metal clip. In place of the installation of the engine by fixing at four points to the fuselage hung cockpit, which was a frame made of steel tubes and wheel duralumin sheet. Due to the removal of the length of the aircraft cabin forward increased 1,325 m. The site, which in the Yak-7 occupied the cabin crew in the Yak-7R Taps for kerosene tanks and tanks of nitric acid.

Due to the installation in the rear part of the engine liquid jet steering wheel cut at the bottom and at the top have increased. Due to this increased the total value of the tail on 0,042 m.

Fighter-interceptor armed with two machine guns UBS, each of which had 200 ammunition cartridges.

Work on the design of the Yak-7R ended in late August of 1942 implement the project failed because of the lack of reliable serial ramjet in wartime. It has been a rocket engine designers D-1A which equipped jet BI development VF Bolkhovitinov.

Yak-7R

Although the aircraft was not possible to build, but in the course of the design has been raised a number of key questions about the equipment of different types of aircraft power plants with rocket and jet engines. This knowledge is applied during the development of the Yak-3RD.

Ramjet - is suspended underwing hollow cylinders that have faired. They happened burning gasoline, which causes the production of additional thrust, the latter has a direct impact on increasing the speed of the aircraft.

These motors have a simple design. They were first tested on a plane and-153 and 15 and-. Having made 60 flight got average growth rate within 25-30 km. Another plus - a small mass of the engine (24 kg). But these motors highly voracious - the gasoline consumed per kg 20 1 min., So it was advisable to use only during the Dogon opponent. At low speeds and during take-off to gain speed was small. These engines are planned to be installed inside the fuselage of some new aircraft.

 

 

Aircraft

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I admire this project Yakovlev, because they really managed to create a new strike aircraft with very high speed performance. Due to the high speed is significantly increased combat efficiency of the aircraft in its class. Even with a small, as many believe, martial margin he could do in the air a lot. As stated below in the comments that the plane had weak armor, maybe so. But first, the enemy had to catch the plane for that would shoot down, and it was at that time the strength is not each enemy aircraft.

Typically, designers first create a flying machine, and a training simulator option or make on its base. The fate of the Yak-7 opposite happened. Development OKB A. Yakovlev training aircraft for the development of new Yak-1 led to the creation of a very successful Yak-7UTI. According to the results of state tests, he was recognized as the best for the retraining and training flights in fighter units and received a recommendation for the launch of a series. But the war has made a priority to ensure parts of warplanes. Therefore, evacuated to Novosibirsk plant constructor Yakovlev OKB K. Sinel'shchikov seconded to assist in the deployment of production, proposed the creation of on the basis of UTIshki complete fighter. Design changes are not carried principle. Even the rear cockpit became unnecessary after the dismantling of the second set of equipment is not cleaned, and used when necessary for the carriage of passengers or goods.
It is noteworthy that the Yak-7 was not only a drill machine, but also successfully served as a basis for testing and debugging of various new products. That it worked out features of the installation and use of air guns of large caliber, we studied the problems sealing the cockpit, considered the possibility of placing an additional fuel reserve through the rational use vnutrifyuzelyazhnyh space and much more.

Most designers pay more attention to the speed of vehicles. So do Yakovlev, but I believe that this position is not quite true, because both opponents had high-speed models. The main problem was that the plane had a very weak armor, which is very poorly protected pilot and the machine itself from enemy attacks. And particularly illogical in the configuration I believe was the battle reserve, which is almost always not enough for a full-scale aerial combat. Yak-7 had its advantages, but the ratio of the aircraft made the ego mediocre combat unit.

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