Yakovlev Yak-7

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YAK7-V, Yakovlev
The YAK7, Yakovlev design was intended as a two seat aircraft (originally designated as the I-27). However, it displayed better performance than the -1 and a single seat version was quickly designed. The aircraft incorporated several other design improvements including an improved engine of greater horsepower. Designated the Yak-7, it reverted to the original canopy design in early models (Yak-7A). Later variants incorporated the improved canopy and cut down rear fuselage (Yak-7B). Other Yak-7 variants included the Yak-7V two seat trainer, the original design purpose of the -7.

Two Seat Tandem Trainer & Liason
Design:Aleksandr Sergeyevich Yakolev
Manufacturer: State Industries
Powerplant: One 1,050 hp (783 kw) M-105P 12-cylinder Vee engine.
Performance: Maximum speed 407 mph (655 km/h) at 10,170 ft (3100 m); service ceiling 35,105 ft (10700 m).
Range: 559 miles (900 km) on internal fuel.
Weight: Empty equipped 4,641 lbs (2105 kg) with a maximum take-off weight of 5,864 lbs (2660 kg).
Dimensions: Span 33 ft 7 1/2 in (10.25 m); length 27 ft 10 1/4 in (8.49 m); height 7 ft 11 1/4 in (2.42 m); wing area 159.53 sq ft (14.83 sq m).
Armament: One engine mounted 20 mm ShVAK cannon with 140 rounds and two synchronised 12.7 mm (0.50 in) UBS machine guns with 348 rounds each.

Variants

Ya-27 (prototype)
Yak-7 (initial designation for the two seat liason/trainer and also for the first single seat conversion)
Yak-7A
Yak-7V (official designation for the two seat trainer)
Yak-7B (shorter winspan of (10.00 m) 32 ft 9 3/4 in)
Yak-7D (experimental)
Yak-7/M-82 (M-82 radial engine)
Yak-7T (anti-tank)
Yak-7K (VIP transport)
Yak-7PVRD (ramjets under wings).

In parallel with the I-26 (or Y-26), the Yakovlev design bureau developed a two seat version under the designation Y-27. One pre-production I-26 was completed to this configuration. It was intended to not only serve as a dual control fighter trainer but also as a liason and unit support aircraft. Compared with the I-26, the Ya-27 was simplified and reduced in weight, the tandem cockpits being enclosed by an extended glazed canopy. The resulting Yak-7 aircraft entered production in May 1941 and was soon found to have better flying qualities than that of the series Yak-1 aircraft. This performance, combined with the urgent need for for more fighters, led to production of a single seat version of which the first was flown in June 1941. In the following month the fighter was officially designated the Yak-7A and the two seater Yak-7V. By the end of 1941, a new single seater, the Yak-7B had replaced the Yak-7A. Total delivery of all versions of the Yak-7 was 6,399 aircraft with production ending in early 1943. Of this number, some 1,500 were Yakovlev Yak-7Vs.

An excellent link for YAK History
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