|Power at 0m||1020hp|
|Power at 2000m||1100hp|
|Weights and loads|
|Wing Load (kg/m2)||173|
|Power load (kg/hp)||2.69|
|Cargo||~100kg in rear cabin|
|Gun Type||1*20mm ShVAK|
|Position||through the hub|
|Gun Type||2*7.62mm ShKAS|
Yak-7 with M-105PA engine and VISh-61P propeller was a conversion of the Yak-7UTI trainer into single-seat combat aircraft. Conversion was performed at Factory N°301 following initiative of the leading engineer K.V.Sinelschikov and team of the Yakovlev OKB members. This team was assigned to the factory to assist in mass production of the Yak-7UTI. They used series aircraft N°04-11 and introduced following changes:
Tailwheel and the canopy remained same as on Yak-7UTI, and except the RS-82 rails both aircraft had identical appearance. New fighter was more advanced than contemporary series Yak-1. It had following advantages:
Empty space of the second cockpit could be used in a number of ways, quite unusual for fighters:
Technical commission of the OKB rated Yak-7 fighter as a perspective design allowing numerous modifications. First reaction of A.S.Yakovlev was skeptical, but after detailed study he approved the conversion. He presented the the Yak-7 design to the top officials, and, in turn, gained support. In August 1941 production was ordered on two factories - N°153 (Novosibirsk) and N°301 (Moscow).
Production of the original Yak-7 was not really a big series one: 51 were assembled in Moscow (Factory N°301) in September-October, and eleven more at Factory N°153 in December 1941. Pause in November was caused by Factory N°301 evacuation and integration into plant N°153.
Yak-7 fighter N°04-11 was evaluated at NII VVS and received positive resume. Detailed studies of aircraft handling were carried out by factory N°153 test pilot A.N.Lazarev and TsAGI team. Yak-7 was considered superior against LaGG-3 and spin safe. Spin could be stopped immediately by placing stick and pedals into neutral position.
In September 1941 Yak-7 N°06-05 with RS-82 launchers installed was sent to the NIPAV (Scientific Trial Range of the Aircraft Armament). Better stability of the Yak-7 and decreased salvo proved its advantage over rocket-armed LaGG-3 and MiG-3:
|Firing Altitude (m)||600||800||500|
|Aircraft speed (km/h)||400||400||400|
|Dive Angle (deg)||50...60||45...50||45...60|
|Range scatter (m)||8...20||5...34||20...82|
|Transverse scatter (m)||6...18||9...29||15...39|
Tests also revealed defects in landing gear, pneumatic system and insufficient assembly quality. Original Yak-7 fighter was replaced in production by improved Yak-7A.
|Created December 17, 2000||Back to|