SU-152 "Taran"

• Name — Object 120 "Taran" • Origin — Soviet Union • Type — Tank destroyer • Is Vehicle — yes • Is Uk — yes • Production Date — 1965 • Number — 1 • Weight — 27 metric tons • Length — 6.87 m (22 ft 6 in) (hull) • Width — 3.12 m (10 ft 3 in) • Height — 2.82 m (9 ft 3 in) • Crew — 4 • Armour — 30 mm (hull front, turret front) • Primary Armament — 152.4 mm M-69 "Taran" rifled gun (9.45m long barrel) • Engine — V-54-105 diesel engine • Engine Power — 353 kW (473 hp) • Transmission — Mechanical • Vehicle Range — 280 km (173 mi) • Speed — 63 km/h (39 mph)

In the early 1960s, the Soviet military concluded that the armor-piercing ammunition used by the T-54 medium tank, and the T-10 heavy tank were getting unreliable at penetrating the frontal armor of the newest American M60 and British Chieftain and because rapid developments in NATO main battle tank armor were suspected, the Soviets began parallel research on several different anti-tank weapon systems, such as the development of new armour-piercing fin-stabilized discarding sabot and shaped charge ammunition for existing tank guns, new rifled and smoothbore tank guns with calibers ranging from 115 mm to 130 mm and anti-tank missiles for infantry and anti-tank missile carriers. One of these projects became the Object 120 "Taran". The factory designation was Object 120 (Объект 120). In terms of firepower and mobility, it surpassed all foreign tank destroyers of the time. The main reason the Object 120 "Taran" wasn't adopted was due to the impracticality of a large caliber gun and the ongoing development and adoption of more cost effective 125 mm smoothbore tank gun and anti-tank missiles.

The Object 120 "Taran" was armed with the 152.4 mm M-69 "Taran" rifled gun, with a barrel length of 9,045 mm, fitted with a powerful muzzle brake. With an overall length of about 10 meters, it is the longest gun of any type ever installed in a fully enclosed armoured fighting vehicle. The gun had a maximum direct fire range of 2,050 meters. The Object 120 "Taran" carried 22 rounds of APFSDS or high-explosive ammunition. The gun had a semi-automatic breech block, with a variable rate of fire of 3–6 rounds/min. The high-explosive ammunition had a 43.5 kg shell and a maximum charge of 10.7 kg. Firing the 12.5 kg APFSDS shell also had a maximum charge of 10.7 kg, which gave it a muzzle velocity of 1,720 m/s, the M-69 "Taran" had an armor penetration of 291 mm of RHA at 60°s at a range of 2,000 meters, or 507 mm at 0°s at a range of 2,000 meters.