The ZSU-23-4 "Shilka" is a lightly armoured Soviet self-propelled, radar guided anti-aircraft weapon system (SPAAG).
The acronym "ZSU" stands for Zenitnaya Samokhodnaya Ustanovka (Russian: Зенитная Самоходная Установка), meaning "anti-aircraft self-propelled mount"; the "23" signifies the bore diameter in millimeters; the "4" signifies the number of gun barrels. It is named after the Shilka River in Russia. Afghan soldiers nicknamed it the "sewing machine" due to the sound of firing guns. It is also referred to by its nickname of "Zeus".
Specifications:
Weight: 19 tonnes
Length: 6.535 m
Width: 3.125 m
Height: 2.576 m (3.572 m with elevated radar)
Crew: 4 (commander, driver, gunner, radar operator)
Armor: Welded steel, 9.2 mm turret, up to 15 mm hull
Main armament: 4 × 23 mm 2A7 autocannons (AZP-23 "Amur" quad automatic anti-aircraft gun), ammunition 2,000 rounds
Engine: V-6R, 6-cylinder 4-stroke airless-injection water-cooled 20 litre diesel 280 hp (209 kW) at 2,000 rpm
Power/weight: 14.7 hp/tonne (11.0 kW/tonne)
Suspension: Individual torsion bar with hydraulic shock absorbers of 1st, 5th left and 6th right road wheels
Ground clearance: 375 mm
Fuel capacity: 515 l
Operational range: 450 km (road), 300 km (off-road)
Speed: 50 km/h (road), 30 km/h (off-road)
