Yakovlev Yak-26
Yakovlev Yak-26 | |
---|---|
Type: | Bomb plane |
Design country: | |
Manufacturer: | |
First flight: |
June 25, 1956 |
Commissioning: |
only troop trials |
Number of pieces: |
2 prototypes + |
The Jakowlew Jak-26 ( Russian Яковлев Як-26 , NATO code name "Flashlight-B") was a Soviet bomber from the second half of the 1950s. Due to poor performance, only a small number were built.
development
Alexander Jakowlew developed the Jak-26 as a supersonic bomber to replace the Jak-25 . In 1955 , the prototype Jak-123 was developed as a parallel design to the Jak-121 interceptor, the later Jak-27 . It was equipped with two RD-9AK engines located in nacelles under the wings , had a tapered, partially glazed fuselage bow and received the PSBN-M ground penetrating radar. It was designed in such a way that it was possible to carry a conventional 1200 kg RDS-4 atomic bomb. On June 25, 1956, the Jak-123, marked with a yellow 50, began flight tests, during which it reached a speed of 1,230 km / h and a peak altitude of 16,000 meters at an altitude of 10,600 meters. In the same year it was presented to the public together with the Jak-121 at the Tushino Air Parade, where it was given the code “Flashlight-B” by NATO observers who mistakenly took it for an interceptor.
In addition to a cell that was only used for fracture tests on the ground, a second prototype called Jak-26-3 was created (yellow 54). It received two improved RD-9F engines equipped with afterburners and the RYM-S as radar. Visually, it differed from the Jak-123 by the missing bulge under the pilot's cabin caused by the PSBN-M. In addition, he received a remote-controlled, horizontally and vertically swiveling 23-mm machine gun Afanasjew-Makarow AM-23 with 100 rounds in the rear . It was not yet available when the Jak-123 was built and was therefore only used in the Jak-26-3. Later prototype No. 1 also received the AM-23. The offensive armament included bombs or unguided rockets on underwing mounts or four downward-pointing 23 mm rapid-fire cannons in the fuselage. The Jak-26-3 was modified several times, for example the four boundary layer fences were removed.
Ultimately, a pilot series of ten machines was created, which were left to the air forces for testing. They failed to meet expectations and received negative reviews, which led to a production stop. Jakowlew revised the Jak-123 again, converted it from RD-9AK to RD-9F drives, optimized the bow glazing and removed the stern cannon, which was classified as ineffective. In their place, the aircraft now known as Jak-26-1 received a braking parachute . It was possible to achieve significantly better performance in the following tests, but since the successor model Jak-129 , which was equipped with the more powerful R-11A-300 engine - the prototype of the later Jak-28 - was already in development, the project was ultimately canceled .
Based on the Jak-25R, the tactical reconnaissance aircraft Jak-122 was developed with various camera equipment in the fuselage and bow. It was also initially tested with two RD-9AK and later received RD-9F. It became the starting model for the reconnaissance version Jak-27R.
Technical specifications
Parameter | Jak-26-3 |
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crew | 2 (pilot and navigator / bombardier) |
span | 10.96 m |
length | 17.16 m |
height | k. A. |
Wing area | 28.94 m² |
Empty mass | 7,295 kg |
Takeoff mass | 11,500 kg |
Engines | two TL Tumanski RD-9F |
power | each 2750 kp without afterburner each 3800 kp with afterburner |
Top speed | 1,400 km / h |
Summit height | 16,800 m |
Range | 2,400 km |
Armament | a 23-mm automatic cannon AM-23 in the rear up to 2,000 kg bombs |
Web links
Individual evidence
- ↑ Joachim Barschin: Jakowlews Zweistrahler in War and Peace. In: Flieger Revue Extra No. 8. Möller, 2005. ISSN 0941-889X . P. 100.
- ↑ Technical data (Russian)