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United States
Twin 40 mm Gun Motor Carriage M19

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The Twin 40 mm Gun Motor Carriage M19 based on the existing SP Gun and was in use from 1944.

Flag of World War 2 United States

General Details
Specifications
Operational Date(s)1944
Ordnance classification
Quantity Produced285
Weightunknown
Crew6
M.G's smalln/a
M.G's large(>10mm)n/a
Length5.54 mtr
Width2.97 mtr
Height2.49 mtr
Engine Details/Performance
Max Road Speed35 mph
Max Cross Country Speed25 mph
Range Road160 miles
Range Cross Countryunknown
Fuel TypePetrol
Fuel Capacity115 gal
Horse Power550 hp
Power/Weightunknown
General Information
The Twin 40 mm Gun Motor Carriage M19 based on the existing SP Gun and was in use from 1944.

Its main armament consisted of a 40mm Automatic Gun M1 which could penetrate 70 mm of flat plate at 100 metres


Armour Details
Turret
Front12mm@(12mm)
Side8mm@(8mm)
Rearn/a
Topn/a
Superstructure
Front12mm@45°(17mm)
Side12mm@(12mm)
Rear6mm@(6mm)
Top6mm@90°(6mm)
Hull
Front12mm@45°(17mm)
Side12mm@(12mm)
Rear6mm@(6mm)
Top6mm@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)
Blank
photo of 40mm Automatic Gun M1 from Wikipedia
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.
ManufacturerBofors
Manufactured1933 - present
Calibre40mm
LengthL/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)10002000300040005000600070008000
Flight Time(Secs) 1.57 4.71 14.18
Direct Fire
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.12 0.25 0.52 1.18 2.02 3.14 4.71 7.06
Hit Probability(%) 98 98 98 96 64 25 8 2
Blast/Fragmentation Effects
Burst radius Infantry in open 99% kill2 mtr Burst radius Infantry in open 66% kill5 mtr
Burst radius Infantry in open 33% kill13 mtr  Armour Penetration inc roof at 1 mtr0 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.

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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