A7 Medium Tank

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Medium Tank A7E1 Medium Tank A7E1.jpg
Medium Tank A7E1
Medium Tank A7E1 Medium Tank A7E1(2).jpg
Medium Tank A7E1
Medium Tank A7E2 Medium Tank A7E2 Front Side View.jpg
Medium Tank A7E2
Medium Tank A7E2 Medium A7E2 Back Side View MT9640.jpg
Medium Tank A7E2
Medium Tank A7E3 Medium Tank A7E3.jpg
Medium Tank A7E3

The A7 Medium Tank [lower-alpha 1] , (or Medium Tank A7), was a British experimental medium tank design of the period between the two World Wars.

Contents

The A7, known as the "14-tonner" was intended as a cheaper design to previous tanks, including the A6 Medium Tank, by not using separate machine gun turrets [1] .

They were designed under the Chief Superintendent of Design at the Royal Ordnance Factory, Woolwich who built three prototypes. A7E1 and A7E2 were complete by end of 1929. They differed in the gearbox used; E1 had a 4-speed gearbox as used on the Medium Mk III the E2 a Wilson planetary gearbox. Both used epicyclic steering. In 1934 work was started on A7E3 which was required to be a "fast" tank and needed a more powerful powerplant. [1] The A7 never went into production as all prototypes proved mechanically unreliable. The turret design, altered to take a 2-pounder (40mm) gun was carried forward onto the A9 (Cruiser Mk I) and A10 (Cruiser Mk II) specification tanks, the E3 engine design was used for the Matilda II infantry tank. [1] .

Variants
TypeEngineGearboxSuspensionSpeedWeight (tons)Armament
A7E1 (1929-1931) Armstrong Siddeley 120 hp V8 petrol air cooled4-speed Armstrong Siddeleycompensated leaf springs40 kph theoretical

(24 kph during trials)

14One QF 3-pounder gun and two .303in Vickers machine guns
A7E2 (1929-1931)Armstrong Siddeley 120 hp V8 petrol air cooled Wilson hydraulic planetarysingle bogies with vertical volute coil springs40 kph

(24 kph during trials)

16.8One 3pdr gun and two .303in Vickers machine guns
A7E3 (1934-1937) Associated Equipment Company 280 hp Twin 6-cylinder CI (diesel) 7.74 L

actual 252 hp [1]

Wilson hydraulic planetaryhelical coil spring on single wheel trailing bogies39 kph on roads and 26 kph off-road theoretical18.2One 3pdr QF gun and two .303in Vickers machine guns

See also

Notes

  1. 1 2 3 4 Duncan, 1973

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References