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Yak-9U

Fighter

Yakovlev

The Yak-9U from 518 Fighter Wing on which at the end of 40 - the beginning of 50th lieutenant M.I.Mihin flied. © Michael Bykov

The Yak-9U from 518 Fighter Wing on which at the end of 40 - the beginning of 50th lieutenant M.I.Mihin flied.

The Yak-9U powered with VK-105-PF2M engine in corporated a number of modifications including the Vlbh-105V-1 (improved) propeller. The variant created on the basis of the Yak-9T differed from the -9U in having another centre panel, Yak-3 type oil cooler and inner MLG door locks. Ailerons mass balances were removed. The cockpit received improved armour protection Engine power increased to 1180 h.p. Yak-9DD type protected fuel tanks accommodated 320 kg of fuel. Oil tank capacity was reduced to 25 I. The aircraft featured new oil and water coolers, the ART-41 water temperature control unit and individual engine exhaust pipes. The cannon was replaced by the more powerful 23mm Vya-23 with an ammunition of 60 shells. Furthermore, there were two UBS machine guns with 170 shells per barrel. The aircraft had maximum takeoff weight of 2990 kg, very high flight performance but flight range of only 850 km. The experimental fighter was built in November 1943 and finished evaluations on 11 March 1944. This version did not see serial production.

Powered with VK-105PF engine and VISh-105SV-01 propeller Yak-9S differed from serial Yak-9M in having two 20mm B-20S cannons (220 shells) and 23mm VYa-23 cannon in place of ShVAK. Two experimental aircraft were built in May 1945. Plant evaluations were undertaken from 10.05.45 to 28.05.45 and Official State tests were performed between 28.09.45 and 14.09.45. These proved unsuccessful because of very low speed. Powered by a 1500 h.p. VK-107A engine, the Yak-9U featured a new OP-554 water cooler, OP-555 oil cooler and VISh-107LO propeller. New engine cooling and exhaust systems were introduced. The wings were moved forward by 100mm and elevator area was decreased to 1.13m2. Armament incorporated 20mm ShVAK cannon and two 12.7mm UBS machine guns with 170 shells per barrel. The fighter was fitted with GS-15-500 general. Maximum takeoff weight was 3150 kg. This experimental fighter was built in December 1943 and the type had been tested by 28 December, 1943. Official State evaluation had been successfully completed by 20 April 1944 by test pilot A. Proshakov. A total of 3921 Yak-9U(VK-107) was delivered from April 1944 to August 1945. However the aircraft was quite temperamental in the context of engine temperature. From December 1944 728 and 726 type coolers were introduced. Oil and water cooler intakes sectionals were increased too. Thus the aircraft had met requirements and it could reach a speed of 575 km/h at sea level and 672 km/h at 5000 m.

The Yak-9UT version was Yak-9U version serialle # 39-# 083. This was armed with 23mm NS-23 cannon (30 shells) and two 20mm B-20S cannons (120 shells per barrel). Undertaken from 8.03.45 to 29.03.45, Official State evaluation proved successful. To add to the State programme, the aircraft was tested at Air Force Research Institute until 9 June 1945. A total of 282 fighters was built between February and May 1945.

The Yak-9UV and Yak-9P were postwar versions. The former didn't see serial production, but the Yak-9P was delivered to the Air Force. Furthermore it took part in the Korean War.

Yak-9 Modifications
Yak-9 Yak-9T Yak-9D Yak-9P Yak-9M Yak-9U Yak-9P
Year of issue 1942 1943 1943 1944 1944 1944 1947
Dimensions
Length, m 8.5 8.66 8.5 8.5 8.5 8.55 8.55
Wing span, m 9.74 9.74 9.74 9.74 9.74 9.74 9.74
Wing area, m² 17.15 17.15 17.15 17.15 17.15 17.15 17.15
Wing loading, kg/m² 167 176 182 196 181 187 207
Weight, kg:
Empty weight 2277 2298 2350 2382 2428 2512 2708
Maximum takeoff weight 2873 3025 3117 3356 3096 3204 3550
Powerplant
Engine M-105PF M-105PF M-105PF VK-105PF VK-105PF VK-107A VK-107A
Power, hp 1180 1180 1180 1180 1180 1500 1500
Power loading, kg/hp 2.43 2.56 2.64 2.84 2.62 2.14 2.37
Performance
Maximum speed, km/h at sea level 520 533 535 507 518 575 590
at altitude 599 597 591 562 573 572 550
m 4300 3250 3650 3750 3750 5000 5000
Time to 5000 m, min 5.1 5.5 6.1 6.5 6.1 5.0 5.8
Time of turn, sec 15-17 18-19 20 25-26 19-20 20 21
Service ceiling, m 11100 10000 9100 8600 9500 10650 10500
Service range, km 875 735 1360 880 950 675 1130
Armament
Cannon, 20-mm 1 1 1 1 1 1 5
Machine guns, 12.7-mm 1 1 1 1 1 2 -

References

  • "Yak-9: Private soldiers of heavens" /Dmitriy Leipnik/
  • "The history of designs of planes in USSR 1938-1950" /Vadim Shavrov/
  • "Planes of Stalin falcons" /Konstantin Kosminkov and Dmitriy Grinyuk/
  • "Stories of the aircraft designer" /Alexander Yakovlev/
  • "The Soviet planes" /Alexander Yakovlev/

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