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Yak-26
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Yak-26

Yakovlev Yak-26

 

Yak-26, classified by NATO as "Flashlight" is a supersonic bomber small OKB-115 series produced under the guidance of Yakovlev. The base for this aircraft machine-made Yak 25R. He is the first in the Soviet supersonic bomber.

After the successful interceptors Yak-25, Yak-125B and Yak-25R, Yakovlev reflected on the creation of a more powerful and faster bomber. He planned to build two copies with the possibility of reaching a maximum speed of 1350-1400 km / h. On the first copy, the RD-9AK engines were planned to be installed and presented to state tests in the GC NII of the Air Force in September 1955. And the second one was planned to be equipped with AM-9F engines and sent to state testing in a year. On the first copy, they intended to install a panoramic radar bombing sight of PSBN-M, and on the second - RYM-S, it was also planned to put the Nursa ARS-57 missiles in the amount of 24 units.

Yak-26 scheme

The new designed bomber was labeled Yak-123, later it was renamed to Yak-26. It was designed on the basis of a prototype of Yak-125B. Engineers met with some problems associated with the design of the NPF, where the navigator's cabin was paved. On TTT it was necessary to equip the aircraft with a sight of OPB-11P and simultaneously make the glazing of the NPF similar to the Yak-125B. It is practically impossible to realize these connections at the same time, as this hindered the achievement of supersonic speed. For this reason, the Yak-123 NPF was a metal plan of the bouncy cone with a flat elliptical window and eight side windows. The Drafting Committee approved the draft. In addition to the design of the NCHF, the lampposts of the cockpit of the pilot changed, the windshield was elliptical. Also, the bomber was equipped with the radar sight of PSBN-MA, which contributes to bombing at night and during bad weather (rain, snow).

The equipment made a radio SCR-70M and RSIU-4, ARC-5 - automatic direction finder, the PLO-48 - blind landing system with built-in radio-MCI 48P marker type. Also added an autopilot AP-40 and altimeter RV-17. From the weapons to the stern had planned to deliver a controlled setting with a gun under the AM-23 23-millimeter ammunition projectiles in 100 pieces. At the time of testing, this installation was not ready, so the OP it is not mounted.

After the factory test aircraft was transferred to the state. Weight pilot version was 10 080 kg. On state tests has become a leading aircraft pilot Seregin. Added weapons, after which the mass was increased to 11 200 kg. Due to the layout of the aircraft and installed engines RD-9AK bomber showed its advantage over rival IL-28. Maximum lift height was 16 000 m and at a height of 10 600 m maximum speed of the aircraft has reached a point in 1230km / h. Thus, the Yak-123 (Yak-26) was the first supersonic bomber front-line use in the USSR.

Chief Designer Yakovlev daring solutions to achieve MIC of serial construction of the aircraft at the best at the time the aircraft factory. Even after factory tests in January 56 issued a decree of the Council of Ministers of the mass production test 10 machinery factory №30. They revealed some nedovodki wing, the LPF and the plumage of the aircraft. Engineers led by the new Deputy Chief Designer S. Kulagin began fine-tuning the aircraft.

Yak-26

Air Force leadership required accelerated action, and a team of engineers to start building the third prototype Yak-26. According to the new decision of the CPSU it was necessary to demonstrate to the state tests, scheduled for March 28 56 years. To him we put forward more stringent requirements. The new prototypes were some differences. For example, it has no speakers for the fuselage contours radome PSBN-MA. A maximum afterburner - 3800 kgs.

In 56 year FRI and OKB-115 held joint flight tests Yak-26-3 to determine the maximum range and speed. As a result it was found out that the machine will require more time to finalize. The aircraft was not able to satisfy all the desires of the Air Force, so their leadership for a long time did not want to accept it.

In 1957 year started routine tests Yak-26 (first prototype), which has undergone many upgrades and dovodok. In particular, it set the RD-9F entirely perekomplektovali navigator compartment, removed the gun from the stern. Increase the area of ​​the wing. Shifted on aileron 1,3 m to the axis of the aircraft. Left are supplied controlled trimmer, and the right - a knife is bent. After all the modifications to the machine potyazhelela 11 500 kg.

As a result of the plane and did not take on large-scale production as parallel OEKB considered more promising plane. Yak-26 served as a great base for future aircraft than took his position in the history of the Russian aircraft industry.

Yak-26 characteristics:



Wingspan, m 10.964
Aircraft Length m 17.16
Height, m  
Wing area, m2 28.94
Weight, kg  
empty aircraft 7295
maksimalanya takeoff 11500
engine's type 2 TRD RD-9AK
Thrust, kgf X 2 2000
Maximum speed km / h 1230
Practical range, km 2050
Practical ceiling, m 15100
Crew 1
Armament: Four 23-1200 mm guns with ammunition
The bomb bay: bomb: 8's FAB-100, 4's FAB-250, 2's FAB-500, RDS-4, into overdrive: 8's FAB-250, 2's FAB-250 + 2's FAB-500, FAB 1500;
Nursi: 2's ARS-240, 4's CARS-212, 12's CARS-160, 125's TRS-82, 8's TRS-212, 30's TRS-132, 140's CARS-57;
1000 container type mines Grad;
Under consoles: Nursi: 2's ARS-240, 4's CARS-212, 14's CARS-160, 20's TRS-82, 4's TRS-212, 12's TRS-132, 38's CARS-57.

 

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Yak 26 is the first supersonic front-line bomber in the USSR. It was created on the basis of Yak 25 and is intended for delivery to the target of a tactical atomic bomb * Natasha *. The first flight was made in the spring of 1956, and in the summer the plane was handed over to state tests, which failed. However, by that time, it had already been decided to build a small series of these machines (10 pcs.). After significant modifications and replacement of engines on the taxiway - 9F in 1957, the aircraft was tested, confirming the declared characteristics. And yet the project of Yak 26 was not realized, because at the same time the more advanced YK 28 aircraft was already being tested, therefore the work on Yak 26 was stopped.

Studying the history of aviation industry of the USSR, I can say that there were many outstanding aircraft that had certain advantages. But Yak-26 became the first in the Soviet Union bombers that could break the sound barrier. Let him not produced on a large scale but he played quite weighty role in further development. Relatively high performance of this machine have been received by developments over the previous model.

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