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Britain
Humber Armoured Car Mk IV

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The Humber Armoured Car Mk IV was designed in 1938, manufactured by Rootes Motors based on the existing 4 x 4 drive Humber Mk 1 and was in use from 1939 to 1945.

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General Details
Specifications
Operational Date(s)1939 - 1945
Quantity Produced2000
Weight5.2 tonne
Crew3
M.G's small1
M.G's large(>10mm)1
Length4.15 mtr
Width2.08 mtr
Height2.31 mtr
Engine Details/Performance
Max Road Speed40 mph
Max Cross Country Speed20 mph
Range Road220 miles
Range Cross Country99 miles
Fuel TypePetrol
Fuel Capacityunknown
Horse Power90 hp
Power/Weight17 hp/tonne
General Information
The Humber Armoured Car Mk IV was designed in 1938, manufactured by Rootes Motors based on the existing 4 x 4 drive Humber Mk 1 and was in use from 1939 to 1945.

The vehicle was powered by Rootes '6 cylinder' petrol powerplant producing 90 HP which could drive the vehicle on roads at up to 40 mph with a range of about 220 miles before refuelling. Its cross country performance was good providing a max speed of about 20 mph and a range of about 99 miles.

It was armed with 1 light machine gun , a BESA Machine Gun 7.92mm. and 1 large machine gun. Its main armament consisted of a 37mm Antitank Gun M6 which could penetrate 45 mm of flat plate at 800 metres .

This was the standard Humber Armoured car but with the Besa 15mm machine gun replaced by the US M5 or M6 37 mm gun.

Armour Details
Turret
Front14mm@20°(15mm)
Side14mm@20°(15mm)
Rear14mm@(14mm)
Top10mm@90°(10mm)
Superstructure
Front14mm@40°(18mm)
Side14mm@15°(14mm)
Rear14mm@60°(28mm)
Top10mm@90°(10mm)
Hull
Front14mm@40°(18mm)
Side14mm@15°(14mm)
Rear14mm@30°(16mm)
Top10mm@90°(10mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 28 mm - Minimum 10 mm



Weapon Details
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BESA Machine Gun 7.92mm
(Machine Gun)
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photo of BESA Machine Gun 7.92mm from Wikipedia
History
Developed by BSA from the Czechoslovak ZB vz.53 heavy machine gun which used the German 7.92×57mm Mauser ammunition. It was mostly used as the main armament of the Light Tank Mk VIC and Armoured cars such as the Humber Mk I to Mk III.

This 7.92mm gun was used in the armoured divisions as their supply lines were separated from the infantry who used .303 bullets. Once the British started capturing German ammunition this could be immediately used in these tank machine guns.
Manufactured1939 - 1966
Calibre7.92mm
LengthL/93
Rate of Fire450 rpm
Number of Rounds 2000
 
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
Cartridge SA, 7.92
(AP Standard Small Arms)
7.92mm 0.011Kg 785M/Sec
Quoted Penetration 11mm @ 1000mtr/0°
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.16 0.37 1.1
Penetration(mm@30°) 10 8 5
Penetration(mm@0°) 12 10 6
Hit Probability(%) 98 98 98


 
Cartridge SA, 7.92
(BALL Standard Small Arms)
7.92mm 0.012Kg 785M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.15
Penetration(mm@30°) 2
Penetration(mm@0°) 3
Hit Probability(%) 98


Weapon Details
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37mm Antitank Gun M6
(Anti Tank Gun)
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History
This was the Tank mounted version of the 37mm M3
ManufacturerWatervliet Arsenal
Calibre37mm
Number of Rounds 40
 
 
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)1002004008001200160020002400
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)1002004008001200160020002400
Flight Time(Secs) 0.13 0.27 0.57 1.29 2.25 3.56 5.51 8.63
Direct Fire
Range(Mtr)1002004008001200160020002400
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% kill0 mtr Burst radius Infantry in open 66% kill1 mtr
Burst radius Infantry in open 33% kill3 mtr  Armour Penetration inc roof at 1 mtr0 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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