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Medium M4A1

General Details
Specifications
Manufacture Date(s)1942
Quantity Produced6281
Weightunknown
Crew5
M.G's small3
M.G's large(>10mm)0
Length5.88 mtr
Width2.63 mtr
Height2.77 mtr
Engine Details/Performance
Max Road Speed24 mph
Max Cross Country Speed17 mph
Range Road120 miles
Range Cross Country0 miles
Fuel TypePetrol
Fuel Capacity175 gal
Horse Power400 hp
Power/Weightunknown
General Information
The Sherman II M4A1 was a similar shape to the M4 but had a curved cast hull which provided less flat surfaces for AT hits, this was mostly noticable at the top of the hull next to the turret.
The cast turret carrying the gyro stabilised 75mm Gun M3 was the same as that of the Sherman I.
It was driven by a Continental 350HP air cooled engine with the drive sprocket at the front, the track went under 3 double bogie wheels onto the idler, then back over 3 return rollers.

Armour Details
Turret
Front75mm@0°(75mm)
Side50mm@0°(50mm)
Rear50mm@0°(50mm)
Top25mm@90°(25 mm)
Superstructure
Front50mm@45°(71mm)
Side50mm@0°(50mm)
Rear38mm@0°(38mm)
Top19mm@90°(19 mm)
Hull
Front40mm@45°(57mm)
Side40mm@0°(40mm)
Rear38mm@0°(38mm)
Top19mm@90°(19 mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 75 mm - Minimum 19 mm


Weapon Details
75mm Gun M3 L/40
Calibre75mm
LengthL/40
 
Ammunition Details
Name/Id Calibre Weight MVelocity Quoted Penetration
 
AP(AP) 75mm 6.32Kg   619M/Sec 70mm@500m
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.16 0.33 0.68 1.45 2.31 3.29 4.41 5.7
Penetration(mm) 76 75 73 69 65 60 56 52
Hit Probability(%) 98 98 98 88 54 25 15 3

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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