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Yak-7

Fighter trainer

Yakovlev

Yakovlev Yak-7V

In late 1941 Plant No.301 and then Plant No. 153 were converted to production of the single-seat fighters, and delivery of the fighter trainers was discontinued, the Yak-7UTI having been the only such variant to have been placed into production. By the middle of 1942 these Yak trainers were reaching the ends of their lives, and the VVS Combat Training Administration repeatedly appealed to the industry to develop a transitional aircraft to facilitate conversion from the Polikarpov U-2 to fighters.

The modifications to Yak-7V (vyvoznoy - introductory, or in western terms, advanced or conversion trainer) standard, carried out out in late 1941 and based on operational experience with the Yak-7UTI, resulted in such an aircraft. Unlike its predecessor the Yak-7V was fitted with a fixed undercarriage that increased its operational life and excluded the probability of undercarriage collapse due to failures or errors by cadets. The trainer differed from the Yak-7 fighter in having its undercarriage legs mounted vertically to ease manufacture. There was no armament at all, and consequently the cowling had no cutouts or knock-out panels.

The Yak-7V was reliable and quite easy to master, yet could perform practically all the aerobatic manoeuvres. Up to late 1943 510 had been delivered, thus meeting the VVS demands completely.

Yakovlev
Yak-7UTI Yak-7V
on wheels
Yak-7V Як-7B Yak-9 Yak-9M
Crew. 2 2 1 1 1 1
Dimensions
Length, m 8.50 8.50 8.50 8.50 8.50 8.50
Wing span, m 10.0 10.0 9.74 10.0 9.74 9.74
Wing area, m² 17.15 17.15 17.15 17.15 17.15 17.15
Weight, kg:
Empty 2,285 2,210 2,344 2,520 2,277 2,428
Loaded 2,800 2,725 3,107 3,042 2,873 3,095
Loading
Wing loading (kg/m²) 163.2 159 182 177 167 181
Power loading (kg/hp) 2.66 2.59 2.5 3.0 2.43 2.62
Powerplant
Engine M-105 M-105 VK-105PF2 M-105PF M-105PF M-105PF
Power, hp 1050 1050 1240 1180 1050 1050
Performance
Maximum speed, km/h at sea level 490 410 506 500 520 518
at altitude 586 472 564 580 599 518
m 4,500 5,000 3,600 4,850 4,300 3,750
Time to level 5000 m, min 6.6 6.6 5.8 6.5 5.1 6.1
Time of turn 360°, sec 18-19 18 20 21-22 16-17 19-20
Service ceiling, m .. 9,900 9,900 10,000 11,100 9,400
Service range, km .. 615 1380 700 875 950
Armament
Cannon/Machine-guns number/Calibre mm 1x7.62 .. 1x20 1x20
2x12.7
1x20
1x12.7
1x20
1x12.7
Second volley, kg 0.23 .. 1.277 2.71 1.997 1.997

References

  • "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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