Report on the issue of rearming the T-60 with a 45 mm model 1938 gun
The 20 mm ShVAK gun installed on the T-60 showed itself lacking in combat conditions (it is hard to manufacture, hard to study, demanding on the battlefield, lacks interchangeable parts, etc). The Molotov GAZ factory is developing a project to install a 45 mm tank gun and a DT machinegun into a T-60 turret, while maintaining the 900 mm turret ring and turret size.
The gun position is as follows (see diagram #1).
- The turret with a 45 mm gun is unbalanced, as a result of which, turning is difficult.
- Servicing the gun alone (loading, observation of the battlefield, aiming, etc) reduces the rate of fire of the gun. The gunner must lose sight of the target after he fires to load, and then re-acquire the target every time.
- In order to access the turning mechanism while sitting, the gunner must put his hand under the gun, which is uncomfortable.
- The brass catcher needs a 30 kg weight to balance the 45 mm gun.
- The recoil resistance (R=3500 kg) acts on the turret ring gears and strikes the turning mechanism, since the gun is off center.
- The fighting compartment is cramped and uncomfortable.
- The tank's firepower is increased. The penetration and range are increased. The tanks are easier to supply with ammunition.
- The 45 mm gun is already in use in the Red Army. It is reliable and easy to produce.
- Mass: 170 kg
- Ammunition: 37 mm AA gun shell
- q: 0.72 kg
- λ: 170 mm
- Maximum pressure: 2800 kg/cm^2
- Length: 2315 mm
- Energy: 30,724 ton-meters
- R=513 kg
- Recoil brake: hydraulic
- Return mechanism: sprint, in one cylinder
- Penetration at 0 degrees (according to the Jacob de Marre formula):
- 100 meters: 54.65 mm
- 500 meters: 45.8 mm
- 1000 meters: 35.8 mm