Medium Mark III, A6
Royal Armored Corps Tank Museum
In 1928 Vickers Armstrong designed the Medium Mark III.2 It was also known as the "16 tonner".2 A three test models were produced.2
Development was stopped in 1931 after a financial crisis cut defense spending.2
A6 E1:
Had two machine guns in each of the forward turrets.2
A6 E2:
Had Ricardo C1 diesel engine installed.1
A6 E3:
Had single commander's cupola.1 In 1937 the engine was replaced by a 500 HP Thorneycroft RY 12 engine.1
| A6 | A6 E1 | A6 E2 | A6 E3 | |
|---|---|---|---|---|
| Crew | 71 | |||
| Physical Characteristics | ||||
| Weight | 17.5 tons2 | 17.5 tons1 | ||
| Length w/gun | 21' 6"1 | |||
| Length w/o gun | ||||
| Height | 9' 2"1 | |||
| Width | 8' 9"1 | |||
| Ground clearance | ||||
| Ground contact length | ||||
| Ground pressure | ||||
| Turret ring diameter | ||||
| Armament | ||||
| Main | 3 pdr (47 mm)2 | 3 pdr QF1 | ||
| Secondary | ||||
| MG | MG, coaxial2 | 5: Vickers .303 MG1 | 3: MG2 | 3: MG2 |
| Side arms | ||||
| Quantity | ||||
| Main | ||||
| Secondary | ||||
| MG | ||||
| Side arms | ||||
| Armor Thickness (mm) | 142 | 9 - 141 | ||
| Hull Front, Upper | ||||
| Hull Front, Lower | ||||
| Hull Sides, Upper | ||||
| Hull Sides, Lower | ||||
| Hull Rear | ||||
| Hull Top | ||||
| Hull Bottom | ||||
| Turret Front | ||||
| Turret Sides | ||||
| Turret Rear | ||||
| Turret Top | ||||
| Engine (Make / Model) | Armstrong Siddeley2 OR Ricardo2 |
Armstrong-Siddeley1 | Ricardo C11 | |
| Cooling | Armstrong: V-82 | air cooled1 | ||
| Cylinders | ||||
| Net HP | 1802 | 1801 | ||
| Transmission | Wilson epicyclic2 | |||
| Fuel type | Diesel1 | |||
| Octane | ||||
| Capacity | ||||
| Performance | ||||
| Traverse | ||||
| Max Speed | 30 mph1 | |||
| Cross Country | ||||
| Road radius | ||||
| Turning Radius | ||||
| Elevation Limits | ||||
| Fording depth | ||||
| Trench crossing | ||||
| Vertical Obstacle | ||||
| Suspension (Type) | ||||
| Wheels each side | ||||
| Return rollers each side | ||||
| Track length | ||||
| Tires | ||||
| Track width | ||||
| Track centers/tread | ||||
| Production |
Sources:
- Tanks of the World, 1915-1945, Peter Chamberlain, Chris Ellis, 1972
- The Royal Armoured Corps Tank Museum, Tanks 1919-1939 The Inter War Period, 1966
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