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United States
Medium M3A4 (Grant VI) (Grant VI)
Ordnance classification - M3A4
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| The Medium M3A4 (Grant VI) based on the existing Medium Tank and was in use from 1941. |
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| | Specifications | | Operational Date(s) | 1941 | | Ordnance classification | M3A4 | | Quantity Produced | 109 | | Weight | unknown | | Crew | 6 | | M.G's small | 3 | | M.G's large(>10mm) | n/a | | Length | 6.05 mtr | | Width | 2.74 mtr | | Height | 3.15 mtr | | Engine Details/Performance | | Max Road Speed | 29 mph | | Max Cross Country Speed | 16 mph | | Range Road | 120 miles | | Range Cross Country | unknown | | Fuel Type | Unknown | | Fuel Capacity | 170 gal | | Horse Power | 370 hp | | Power/Weight | unknown | | | General Information | The Medium M3A4 (Grant VI) based on the existing Medium Tank and was in use from 1941.
It was armed with 3 light machine guns. Its main armament consisted of a 37mm Antitank Gun M6 which could penetrate 64 mm of flat plate at 200 metres
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. | |
| | Turret | | Front | | 51mm | @ | 47° | (75mm) | | Side | | 51mm | @ | 5° | (51mm) | | Rear | | 51mm | @ | 5° | (51mm) | | Top | | 22mm | @ | 90° | (22mm) |
| | Superstructure | | Front | | 51mm | @ | 45° | (72mm) | | Side | | 38mm | @ | 0° | (38mm) | | Rear | | 38mm | @ | 0° | (38mm) | | Top | | 13mm | @ | 87° | (13mm) |
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| Hull | | Front | | 45mm | @ | 45° | (64mm) | | Side | | 38mm | @ | 0° | (38mm) | | Rear | | 38mm | @ | 0° | (38mm) | | Top | | 13mm | @ | 87° | (13mm) |
| | Armour (x)mm @ (y)° (Effective mm @ 0°) | | Effective Armour - Maximum 75 mm - Minimum 13 mm |
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| Weapon Details |
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37mm Antitank Gun M6
(Anti Tank Gun) |
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| | History | |
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| | This was the Tank mounted version of the 37mm M3 |
| | Manufacturer | Watervliet Arsenal |
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| | Calibre | 37mm |
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| Ammunition Details |
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| Name/Id |
Calibre Weight MVelocity |
Explosive Content |
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AP M74 Shot
(AP Armor Piercing)
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37mm 0.86Kg 885M/Sec | |
| Quoted Penetration 36mm @ 500mtr/0° |
| Range(Mtr) | 100 | 200 | 400 | 800 | 1200 | 1600 | 2000 | 2400 |
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| Flight Time(Secs) |
0.12 |
0.24 |
0.51 |
1.15 |
2.01 |
3.19 |
4.93 |
7.73 |
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| Penetration(mm@30°) |
61 |
55 |
48 |
38 |
30 |
22 |
16 |
10 |
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| Penetration(mm@0°) |
71 |
64 |
56 |
45 |
35 |
26 |
19 |
12 |
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| Hit Probability(%) |
98 |
98 |
98 |
96 |
64 |
25 |
8 |
2 |
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HE M63 Shell
(HE High Explosive)
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37mm 0.73Kg 792M/Sec | 0.039Kg explosive |
| Maximum Range not shown as gun elevation is limited |
| Range(Mtr) | 100 | 200 | 400 | 800 | 1200 | 1600 | 2000 | 2400 |
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| Flight Time(Secs) |
0.13 |
0.27 |
0.57 |
1.29 |
2.25 |
3.56 |
5.51 |
8.63 |
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| Direct Fire |
| Range(Mtr) | 100 | 200 | 400 | 800 | 1200 | 1600 | 2000 | 2400 |
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| Flight Time(Secs) |
0.13 |
0.27 |
0.57 |
1.29 |
2.25 |
3.56 |
5.51 |
8.63 |
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| Hit Probability(%) |
98 |
98 |
98 |
93 |
57 |
22 |
3 |
1 |
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| Blast/Fragmentation Effects |
| Burst radius Infantry in open 99% kill | 0 mtr |
Burst radius Infantry in open 66% kill | 1 mtr |
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| Burst radius Infantry in open 33% kill | 3 mtr |
Armour Penetration inc roof at 1 mtr | 0 mm |
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| An explosion within 1 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's. |
| An explosion within 3 mtr of infantry in the open will cause 33% casualties. |
| The blast effect of this shell exploding within 1 mtr of an armoured vehicle will not cause any significant armour damage. |
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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.
© WWIITanks 1980-2024
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