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Britain
M3 Grant (Grant)

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The M3 Grant was designed in 1940 based on the existing fully tracked Medium Tank and was in use from 1941 to 1942.

Photo of M3 Grant (Grant)
M3 Grant(Grant) scale illustration

General Details
Specifications
Operational Date(s)1941 - 1942
Quantity Produced0
Weight27 tonne
Crew6
M.G's small3
M.G's large(>10mm)n/a
Length5.69 mtr
Width2.74 mtr
Height3.15 mtr
Engine Details/Performance
Max Road Speed21 mph
Max Cross Country Speed11 mph
Range Road120 miles
Range Cross Country48 miles
Fuel TypePetrol
Fuel Capacity175 gal
Horse Power340 hp
Power/Weight12 hp/tonne
General Information
The M3 Grant was designed in 1940 based on the existing fully tracked Medium Tank and was in use from 1941 to 1942.

The vehicle was powered by Wright 'Continental R975 EC2' petrol powerplant producing 340 HP which could drive the vehicle on roads at up to 21 mph with a range of about 120 miles before refuelling. Its cross country performance was good providing a max speed of about 11 mph and a range of about 48 miles.

It was armed with 3 light machine guns. Its main armament consisted of an Ordnance Q.F. 37mm Mk 1 which could penetrate 53 mm of flat plate at 200 metres Its main armament consisted and an Ordnance Q.F. 75mm which could penetrate 106 mm of flat plate at 200 metres.

The Medium tank M3 Grant was was an American M3 Lee tank modified by replacing the original turret by a lower profile one with a large overhang at the rear to take radios, the Grant was the British version.

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



Weapon Details
Flag
Ordnance Q.F. 37mm Mk 1 Blank
photo of Ordnance Q.F. 37mm Mk 1 from Wikipedia
History
Used both as an Anti Tank gun and as a Tank gun the 2pdr was first used by the Belgians in 1939 and the majority of the British guns were captured by the Germans at Dunkirk and given their designation of 4.0 cm Pak 192(e) or 4.0 cm Pak 154(b).
Manufactured1936 - 1944
Calibre37mm
LengthL/52
Rate of Fire22 rpm
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
AP(AP)
37mm 0.74Kg 850M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.12 0.25 0.53 1.2 2.09 3.32 5.12 8.07
Penetration(mm@30°) 51 45 39 32 25 19 12 8
Penetration(mm@0°) 59 53 46 37 29 22 15 10
Hit Probability(%) 98 98 98 96 64 25 6 2


Weapon Details
Flag
Ordnance Q.F. 75mm Blank
photo of Ordnance Q.F. 75mm from Wikipedia
History
This was a temporary fix to the problem of 6pdr guns not having a powerful enough HE shell. It was created by boring out the British 57mm 6pdr to take the American 75mm AP/HE shells, which reduced the Anti Tank performance but provided HE support.
Manufactured1943 - 1945
Calibre75mm
LengthL/32
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
AP(AP)
75mm 6.58Kg 618M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.16 0.33 0.68 1.45 2.31 3.29 4.41 5.71
Penetration(mm@30°) 98 91 83 73 64 55 46 38
Penetration(mm@0°) 114 106 96 85 74 64 54 45
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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