The ZSU-57-2 was a ightly armoured, self propelled air defence armed with two 57 mm cannons. ZSU stands for Zenitnaya Samokhodnaya Ustanovka - anti-aircraft self-propelled
system.The vehicle entered service in 1955 and remained in production until 1960.
They carried two 57mm S-68 L/69 cannon (a variant of the S-60 ) in a large open-topped turret mounted on a modified T-54 tank chassis. The guns elevated from -5° to +85° at 20°
per second, and the turret could traverse 360 degrees, at 30° per second. The cannon was capable of firing up to 120 FRAG-T or APC-T rounds per minute from each barrel, with
a sustained rate of fire of around 70 rounds per minute per barrel. Maximum horizontal range reached 12,000 m (with maximum effective range is around 4km / 2.5miles) and
maximum altitude 8,000m (maximum effective altitude around 4250m / 14,000ft). 316 rounds of ammunition were carried in the vehicle. Empty shell casings and clips were
emptied into a metal basket on the back of the turret via a conveyor. The fire-control was purely optical (no radar).
