T32 heavy tank

The T32 heavy tank was a heavy tank project started by the United States Army to create an appropriate successor to the M4A3E2 Sherman "Jumbo". The US Ordnance board managed the production of four prototypes, the main goal being to have the new tank share many common parts with the M26 Pershing.

T32 heavy tank
Type	Heavy tank
Place of origin	United States
Service history
Used by	United States
Wars	none
Production history
Designed	1945
Produced	1945–1946
No. built	4
Variants	T32 (2) T32E1 (2)
Specifications
Mass	120,000 lb (54,431 kg; 54 t)
Length	426.6 in (35.55 ft; 10.84 m) with gun 278.4 in (23.20 ft; 7.07 m) without gun
Width	148.3 in (12.36 ft; 3.77 m)
Height	110.7 in (9.23 ft; 2.81 m)
Crew	5
Armor	Turret Front: 298 mm (11.7 in) Side: 152–197 mm (6.0–7.8 in) Rear: 152 mm Gun shield: 298 mm Hull Front: 95–127 mm (3.7–5.0 in) Side: 76 mm (3.0 in) Rear: 51 mm (2.0 in)
Main armament	T15E2 90mm L/73 gun
Secondary armament	T32: 1 × Browning .50 in (12.7 mm) caliber heavy machine gun HMG 2 × Browning .30 in (7.62 mm) caliber medium machine gun MMG T32E1: 1 × Browning .50 caliber HMG 1 × Browning .30 caliber MMG
Engine	Ford GAC V12, 770 hp (570 kW)
Power/weight	14.36 hp/t (10.71 kW/t)
Transmission	Cross Drive Transmission
Suspension	torsion-bar
Operational range	100 mi (160 km) (road range)
Maximum speed	22 mph (35 km/h) (roads)

History and development

Despite its promising performance during the final stages of World War II, the M26 Pershing was thought to be too lightly armored to do battle with most German heavy tanks and tank destroyers, such as the Tiger II. Even though its gun was able to penetrate armor satisfactorily, its own armor was believed to be insufficient at stopping enemy shells. Work began in early 1945 to develop a significantly heavier variant of the M26 Pershing. Using data collected from the T29 Heavy Tank project and incorporating an experimental 90mm main gun firing armor-piercing, composite rigid ammunition as well as a more advanced transmission, the first T32 tank was produced. The T15E2 gun mounted on this tank was much more powerful than the gun mounted on the Pershing, and similar to the T26E4 Super Pershing which utilized a similar experimental 90mm, the counterweight at the back of the turret was enlarged substantially to offset the long gun's weight. The T32E1 variant eliminated weak spots in the frontal armor, including removing the hull mounted machine gun. As a result of all the changes, the M26 chassis had to be expanded, with an extra road wheel added on each side, bringing the total to seven, to reduce the ground pressure due to the tank's increased weight. After the end of World War II, the project was cancelled and the vehicles were scrapped.

	T32	T32E1
Length (gun forward)	446.6 in (11.3 m)
Width	148.3 in (3.8 m) (over sandshields)
Height	110.7 in (2.8 m) (over cupola)
Ground clearance	18.3 in (46.5 cm)
Top speed	22 mph (35 km/h)
Fording	48 in (1.2 m)
Max. grade	60%
Max. trench	8.5 ft (2.6 m)
Max. wall	46 in (1.2 m)
Range	100 mi (160 km)
Power	770 hp (570 kW) at 2800 rpm
Power-to-weight ratio	12.8 hp/ST (10.5 kW/t)
Torque	1,560 lb⋅ft (2,120 N⋅m) at 1600 rpm
Weight, combat loaded	120,000 lb (54,430 kg)
Ground pressure	11.6 psi (80 kPa) (28 in (71 cm) tracks) 14.2 psi (98 kPa) (23 in (58 cm) tracks)
Main armament	T15E2 90 mm gun
Elevation, main gun	+20° / −10°
Traverse rate	15 seconds/360°
Main gun ammo	54 rounds
Firing rate	4 rounds/minute

Sources

• Hunnicutt, Richard Pearce (1988). Firepower: A History of the American Heavy Tank. Novato, California: Presidio Press. ISBN 0-89141-304-9.