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Yak-9P
The Yak-9P (cannon) with the M-105PF engine was the result of another attempt to increase the power of the Yak-9 onboard weapons, in this case by installing a second ShVAK cannon instead of the UBS synchronous machine gun. Let us recall that it was precisely such weapons that were on the La-5 fighters, and the pilots' reviews of the Lavochkin's firepower were more favorable. The ammunition load of the second gun was 165 shells (instead of 200 UBS rounds), and the second salvo increased 1.25 times compared to the standard armament of the Yak-9. In terms of flight and tactical characteristics, piloting technique, stability and controllability, as well as takeoff and landing properties, the Yak-9P practically did not differ from the Yak-9, but aiming was disrupted when firing in bursts, especially if the speed at the moment of opening fire was not high enough, therefore when shooting, it was necessary to clarify the aiming all the time. The Yak-9P was built at the Design Bureau in March 1943 and underwent state tests at the Air Force Research Institute from March 17 to April 8, 1943 (pilot A. Proshakov, lead engineer G. Sedov). The assessment was generally positive, but they refrained from serial construction due to the difficulties that arose during the shooting. However, the experience of installing the second gun could be used to create more advanced Yak-9 TK vehicles with the M-105PF engine. An attempt to strengthen the Yakov's armament was also the idea of making the plane transformable for various guns. It was about the possibility of equipping the Yaki with various guns directly in the combat units, with the available forces of the technical staff, depending on the needs. The installation of the guns, according to the developers, was to be carried out in the field, provided there was an appropriate set of weapons and fasteners to it (MP-20 and MP-37). We add that in order to install a new weapon, it was necessary to replace the gas outlet pipes, as well as all the power supply units for the weapon (cartridge boxes, sleeve and link outlets, etc.) And also the hoses of the pneumatic systems ... It was assumed that in addition to the standard gun, in this way it would be possible to mount VYa-23 (23 mm), NS-37 and even NS-45. The following weapon options were envisaged: 20, 23, 37 mm cannon firing through the propeller hub (ammunition load, respectively, 120, 80 and 30 rounds) and two synchronous 20 mm cannons (120 rounds per barrel) 45 mm cannon (20 rounds) and two synchronous 20 mm cannons (120 rounds each). 57 mm cannon and one synchronous cannon with 120 rounds. |
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