United States
Medium M2A1
Ordnance classification - M2A1

Tweet The Medium M2A1 based on the existing Medium Tank and was in use from 1940. General Details Specifications Operational Date(s) 1940 Ordnance classification M2A1 Quantity Produced 74 Weight unknown Crew 6 M.G's small 8 M.G's large(>10mm) n/a Length 5.43 mtr Width 2.66 mtr Height 2.86 mtr Engine Details/Performance Max Road Speed 30 mph Max Cross Country Speed 17 mph Range Road 130 miles Range Cross Country unknown Fuel Type Petrol Fuel Capacity 175 gal Horse Power 350 hp Power/Weight unknown General Information The Medium M2A1 based on the existing Medium Tank and was in use from 1940. It was armed with 8 light machine guns. Its main armament consisted of a 37mm Antitank Gun M6 which could penetrate 64 mm of flat plate at 200 metres Armour Details Turret Front 32mm @ 47° (47mm) Side 25mm @ 5° (25mm) Rear 25mm @ 5° (25mm) Top 18mm @ 90° (18mm) Superstructure Front 32mm @ 45° (45mm) Side 25mm @ 0° (25mm) Rear 25mm @ 0° (25mm) Top 13mm @ 87° (13mm) Hull Front 32mm @ 45° (45mm) Side 25mm @ 0° (25mm) Rear 25mm @ 0° (25mm) Top 13mm @ 87° (13mm) Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 47 mm - Minimum 13 mm Weapon Details 37mm Antitank Gun M6 (Anti Tank Gun) History This was the Tank mounted version of the 37mm M3 Manufacturer Watervliet Arsenal Calibre 37mm   Ammunition Details Name/Id Calibre Weight MVelocity Explosive Content AP M74 Shot (AP Armor Piercing) 37mm 0.86Kg 885M/Sec Quoted Penetration 36mm @ 500mtr/0° Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.12 0.24 0.51 1.15 2.01 3.19 4.93 7.73 Penetration(mm@30°) 61 55 48 38 30 22 16 10 Penetration(mm@0°) 71 64 56 45 35 26 19 12 Hit Probability(%) 98 98 98 96 64 25 8 2 HE M63 Shell (HE High Explosive) 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 Flight Time(Secs) 0.13 0.27 0.57 1.29 2.25 3.56 5.51 8.63 Direct Fire Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.13 0.27 0.57 1.29 2.25 3.56 5.51 8.63 Hit Probability(%) 98 98 98 93 57 22 3 1 Blast/Fragmentation Effects Burst radius Infantry in open 99% kill 0 mtr Burst radius Infantry in open 66% kill 1 mtr Burst radius Infantry in open 33% kill 3 mtr  Armour Penetration inc roof at 1 mtr 0 mm 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.

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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