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Medium M3A4 (Grant VI)

General Details
Specifications
Manufacture Date(s)1941
Quantity Produced109
Weightunknown
Crew6
M.G's small3
M.G's large(>10mm)0
Length6.05 mtr
Width2.74 mtr
Height3.15 mtr
Engine Details/Performance
Max Road Speed29 mph
Max Cross Country Speed16 mph
Range Road120 miles
Range Cross Country0 miles
Fuel TypeUnknown
Fuel Capacity170 gal
Horse Power370 hp
Power/Weightunknown
General Information
A specification for the M3 Grant was laid down in 1940 as a new medium tank with thicker armour than the previous medium tanks, and mounting a 75mm gun. Unfortunately the designs for a turret to mount the 75mm gun were not fully developed, so a rotating turret with the 37mm Antitank Gun M6 which had been developed for the T5E2 was used. The 75mm Gun M2 was mounted in a sponson to the right of the vehicle.

Both guns had giro stabilisers which made it possible to fire accurately on the move.

The vehicle transmission sprocket was at the front, the track passed under 6 road wheels on three bogies to the rear idler, then return via 3 return rollers. The M3A4 was fitted with a 360HP Chrysler engine which was made up from five car engines connected on a common drive, as a stopgap for engine shortages.

Armour Details
Turret
Front51mm@47°(75mm)
Side51mm@5°(51mm)
Rear51mm@5°(51mm)
Top22mm@90°(22 mm)
Superstructure
Front51mm@45°(72mm)
Side38mm@0°(38mm)
Rear38mm@0°(38mm)
Top13mm@87°(13 mm)
Hull
Front45mm@45°(64mm)
Side38mm@0°(38mm)
Rear38mm@0°(38mm)
Top13mm@87°(13 mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 75 mm - Minimum 13 mm


Weapon Details
37mm Antitank Gun M6
Calibre37mm
 
Ammunition Details
Name/Id Calibre Weight MVelocity Quoted Penetration
 
AP(AP) 37mm 0.86Kg   885M/Sec 25mm@2000m
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.12 0.24 0.51 1.15 2.01 3.19 4.93 7.73
Penetration(mm) 60 58 55 48 41 35 28 21
Hit Probability(%) 98 98 98 96 64 25 8 2

Hit probability is based on a static 2 x 2.4 metre panel at 0 degrees(vertical) at the range specified.

The data that has been used to create these records has come from Wikipedia, The Lone Sentry, The Bundes Archive and numerous books and websites that have provided the detailed information that has not been available anywhere else. The information we use to calculate the penetration tables, flight times and the hit probability comes from the Gun Calibre, the Shell Mass(Kg) and the muzzle velocity, plus range reductions to allow for gravity and wind resistance. This calculation originally came from a pre-war Krupp calculation which has been modified, and seems to fit the actual test results.

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