76-mm F-24 Regimental Gun Technical details
- Years of production-1940
- Total issued – 4 units.
- Caliber-76 mm
- Weight in combat position-950 kg
- Barrel length-1785 mm
- Length of the rifled part – no data available
- Calculation – no data available
- Driving speed-up to 50-60 km / h
- Rate of fire-up to 20 rounds / min
- Maximum firing range-10,000 m
- Direct shot range-no data available
- Firing angles:
- Horizontal – 60°
- Vertical – 8° +65°
76-mm F-24 Regimental Gun Details
The 76-mm regimental gun of the 1927 model of the year already in the mid-1930s ceased to meet all the requirements of the Red Army, which was due to the low rate of fire due to the outdated design of the piston bolt, small angles of vertical and horizontal guidance, as well as low transport speed.
Great complaints were also caused by the relatively weak ballistics of the gun, which limited its maximum firing range and armor penetration, especially since at this time tanks with powerful anti-shell armor began to enter service with foreign armies. Modernization of the regimental gun of the 1927 model of the year showed the impossibility of qualitative improvement in the characteristics of the gun while maintaining the existing single-bar carriage. In 1936, these works were stopped and a fundamental decision was made to design a new gun.
In the autumn of the same year, the GAU of the Red Army issued a task to the Leningrad Kirovsky Zavod for the development of a new 76-mm regimental howitzer-gun. The new gun, due to the lengthening of the barrel, compared to the 1927 model gun, had to have improved ballistics, the vertical guidance angle was not less than 70°, and the horizontal guidance angle was not less than 60°. Its mass should not exceed 950 kg . The gun was supposed to fire a standard high-explosive fragmentation projectile with a muzzle velocity of 500 m / s at a range of up to 10 km . At the same time, its own F-24 regimental gun, developed on its own initiative, was also presented by the Design Bureau of plant No. 92 under the leadership of V. G. Grabin. It was unified with another prototype-the 76-mm mountain gun F-31, created in 1936. Both guns were almost identical: they had the same barrel with a bolt and semi-automatic, recoil devices, cradle, sight, guidance mechanisms, balancing mechanism, wheels and shield, differing only in the fact that the regimental gun, unlike the mountain one, received an unbreakable design.
The F-24 gun had a riveted single-bar carriage. However, the GAU task was not completed. Therefore, in 1938, the GAU leadership decided to resume work on regimental guns. The People’s Commissariat of Armaments of the USSR announced a competition for the creation of a regimental gun, the tactical and technical requirements of which repeated the conditions of the previous order to the Kirov Plant. It was envisaged that the new 76-mm field gun, with a mass of no more than 800 kg, would have a maximum elevation angle of 65 degrees, and a horizontal guidance angle of 60 degrees. New requirements included the creation of a carriage with sliding frames, the rejection of a variable height of the firing line due to the kink of the combat axis due to the complexity of such a design, as well as the use of a cartridge and a chamber from a mountain gun of the 1938 model.
The competition was attended by design teams of Leningrad factories-Kirovsky and No. 7 Arsenal named after Frunze, as well as Gorky Plant No. 92 Novoe Sormovo. In 1940, plant No. 92 was manufactured for conducting field tests
4 F-24 guns. It had a two-wheeled carriage with a box-shaped type, on which a monoblock barrel was mounted with a chamber from a 76-mm divisional gun mod. 1902 / 30 years with a semi-automatic vertical wedge bolt copied from the F-22 divisional gun and sprung wheel travel. The gun barrel consisted of a free tube, casing and breech. The lifting mechanism had one sector mounted on the cradle. The rotary mechanism is helical. The hydraulic recoil brake was mounted under the cradle, and the hydro-pneumatic knurler was mounted above the cradle. The gun had a variable rollback length (maximum-900 mm, minimum-600 mm). The height of the firing line was 920 mm . Metal wheels – automobile type with bullet-resistant tires filled with sponge rubber from the GAZ-A car.
The gun’s ammunition package included unitary shots with armor-piercing shells, high-explosive fragmentation grenades, as well as unitary shots with shrapnel. The F-24 regimental gun passed field tests, showing good characteristics. At the same time, its main disadvantage was the large mass in the combat position ( 925 kg ), which significantly limited its mobility on the battlefield. Therefore, the F-24 gun was never adopted. Nevertheless, work on this artillery system was not in vain – its design was the basis for the project of the 57-mm anti-tank gun ZIS-2.