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YaG-10, 29-K 76mm Anti-Aircraft SPG

The 8-ton YaG-10, built at the Yaroslavl state motor vehicle plant (»YaG« or »YaGAZ«) from 1931 on, was for long the heaviest truck of the Soviet Union. Not surprising for the time when domestic truck production was just starting, it partly had to rely on foreign technology. The 96hp. Herkules YXC engine was imported from the U.S. and the rear suspension was copied from the ingenious British WD construction giving the new truck an excellent performance. Production of the YaG-10 ended in 1940 with a total of just 333 vehicles, some of them used as base for the 76mm 3-K Model 1931 AA gun, out of which 61 conversions were made.

On August 28, 1930, the BUTAST company (a front office of the Rheinmetall company) signed a contract for the supply in the USSR of four prototypes and manufacturing technology of 7.5 cm anti-aircraft guns (7.5 cm Flak L / 59), which at that time were still undergoing trials. On June 7, the prototype was delivered to the Scientific Test Artillery Test Site, and the very next day firing was started in order to select a charge to achieve a given initial projectile velocity of 820-830 m / s.

On the basis of the technology received from Rhinemetall, Plant No. 8 manufactured prototypes of an anti-aircraft gun, which received a factory index of 3-K. Working drawings were prepared by G. P. Tagunov and N. Gorokhov. In February-April 1932, original samples made in Germany were tested at the Scientific Research Antiaircraft Range in conjunction with samples manufactured at Plant No. 8. In the same year, the gun was put into service under the name “76-mm anti-aircraft gun mod. 1931.

In 1934, the design bureau of plant number 8 to them. Kalinin received an order for the installation of a 76-mm anti-aircraft artillery system 3K on the chassis of a three-axle YAG-10 truck, which was mastered at that moment by the Yaroslavl Automobile Plant. ZSU was assigned an index of 29K. At the same time, the ANIA was instructed to develop a mobile PUAZO on the chassis of the same vehicle. During 1934-1936, the work was completed, and the plant released the first batch of ZSU of 20 units and received an order for the second such batch. In August-September 1936, ZSU tests were conducted at the NIAP test site. The first cars entered service with parts of the Moscow Military District.

In the body of the YaG-10 with a reinforced bottom, a swinging part of a 76.2-mm 3K anti-aircraft gun was mounted on a standard pedestal lowered relative to the platform by 85 mm to increase stability when firing. The side boards are replaced by semicircular armored shields, which recline in combat position, forming a platform for maintenance of the gun. The boards provide space for the four numbers of calculation (two on board). In the front of the body, behind the driver's cabin, there are two ammunition boxes for 24 unitary cartridges each. To increase the lateral stability when firing, the ZSU is equipped with four reclining supports.