The Twin 40 mm Gun Motor Carriage M19, it was based on the SP Gun chassis and was in use from 1944. General Details (SP Artillery) Specifications Operational Date(s) 1944 Ordnance classification Quantity Produced 285 Weight unknown Crew 6 M.G's small n/a M.G's large(>10mm) n/a Length 5.54 mtr Width 2.97 mtr Height 2.49 mtr Engine Details/Performance Max Road Speed 35 mph Max Cross Country Speed 25 mph Range Road 160 miles Range Cross Country unknown Fuel Type Petrol Fuel Capacity 115 gal Horse Power 550 hp Power/Weight unknown General Information The Twin 40 mm Gun Motor Carriage M19, it was based on the SP Gun chassis and was in use from 1944. Its main armament consisted of a 40mm Automatic Gun M1 weighing 0.950 kg. Armour Details Turret Front 12mm @ 0° (12mm) Side 8mm @ 0° (8mm) Rear n/a Top n/a Superstructure Front 12mm @ 45° (17mm) Side 12mm @ 0° (12mm) Rear 6mm @ 0° (6mm) Top 6mm @ 90° (6mm) Hull Front 12mm @ 45° (17mm) Side 12mm @ 0° (12mm) Rear 6mm @ 0° (6mm) Top 6mm @ 90° (6mm) Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 17 mm - Minimum 6 mm Weapon Details 40mm Automatic Gun M1 (Anti Aircraft) History Designed in 1930 in Sweden the Bofors had two variants the L/60(really L/56) and the L/70 which didn't reach production till 1948, so the data shown is for the L/60 version. America manufactured this gun from 1941 and Chrysler added water cooling. Manufacturer Bofors Manufactured 1933 - present Calibre 40mm Length L/56 Ammunition Details Name/Id Calibre Weight MVelocity Explosive Content 40 × 311 mm R (HE High Explosive) 40mm 0.95Kg 850M/Sec ≈0.143Kg explosive Range(Mtr) 1000 2000 3000 4000 5000 6000 7000 8000 Flight Time(Secs) 1.39 3.2 5.33 7.69 10.2 12.77 15.36 17.93 lateral dispersion means the side to side variation of the shell from the aiming point 50%(CEP) of shells land within +/- (mtr) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 80% of shells land within +/- (mtr) 95% of shells land within +/- (mtr) range dispersion means the back to front variation of the shell from the aiming point 50%(CEP) of shells land within +/- (mtr) 80% of shells land within +/- (mtr) 95% of shells land within +/- (mtr) Direct Fire Range(Mtr) 100 200 400 800 Flight Time(Secs) 0.12 0.25 0.52 1.13 Hit Probability(%) 79 79 76 71 Blast/Fragmentation Effects Burst radius Infantry in open 99% kill 2 mtr Burst radius Infantry in open 66% kill 5 mtr Burst radius Infantry in open 33% kill 13 mtr  Armour Penetration inc roof at 1 mtr 0 mm An explosion within 2 mtr of infantry in the open will cause 99% casualties - lethal. An explosion within 5 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's. An explosion within 13 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. About Penetration Figures All penetration figures in this database are calculated to a common standard based on German WWII testing criteria (complete penetration with functioning fuze). This allows direct comparison between all nations' guns. Original national test figures would be higher for some nations due to different criteria: German: 1.00? (baseline - strictest) British: 1.02? (slightly looser) American: 1.05? (50% mass through plate) Soviet: 1.10? (75% mass through plate) For example, a Soviet gun showing 159mm here would be published as ~175mm in Soviet documents, and a German gun showing 120mm would be published as 120mm in German documents. The 159mm figure is directly comparable to the German 120mm - the Soviet gun really was more powerful. National Testing Standards German: 1.00? - Complete penetration, fuze functions (strictest) British: 1.02? - Complete penetration American: 1.05? - 50% of shell mass through plate Soviet: 1.10? - 75% of shell mass through plate All database figures are normalized to German standard for direct comparison. Multiply by the factor above to see original national test figures.

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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