Sentinel tank

Australian Cruiser Tank Mk. 1 "Sentinel"
An AC MkI tank on trials
Type	Cruiser tank
Place of origin	Australia
Production history
Designed	1941
Manufacturer	New South Wales Railway Company
Produced	1942-1943
No. built	65
Specifications
Mass	28 long tons (28.4 t)[1]
Length	20 feet 9 inches (6.32 m)
Width	9 feet 7⁄8 inch (2.77 m)
Height	8 feet 4+3⁄4 inches (2.56 m)
Crew	5 (Commander, Gunner, Loader/Operator, Driver, Hull MG gunner)
Armour	Hull front 65 millimetres (2.6 in) sides and rear 45 millimetres (1.8 in) Turret 65 millimetres (2.6 in) all round
Main armament	2 pounder tank gun, 130 rounds
Secondary armament	two .303 (7.7 mm) Vickers machine guns, 4,250 rounds
Engine	3 x Cadillac V8 330 horsepower (246 kW)[1]
Power/weight	12 hp/ton
Suspension	Horizontal Volute Spring
Operational range	150 miles (240 km)[1]
Maximum speed	30 miles per hour (48 km/h)

The AC1 Sentinel was a cruiser tank designed in Australia in World War II in response to the war in Europe, and to the threat of Japan expanding the war to the Pacific or even a feared Japanese invasion of Australia. It was the first tank to be built with a hull cast as a single piece, and the only tank to be produced in quantity in Australia. The few Sentinels that were built never saw action as Australia's armoured divisions had been equipped by that time with British and American tanks.^[2]