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Britain
Light Tank Mk VII ICS (Tetrarch ICS)

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The Light Tank Mk VII ICS based on the existing Light Tank and was in use from 1940.

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General Details
Specifications
Operational Date(s)1940
Ordnance classification
Quantity Produced0
Weightunknown
Crew3
M.G's small1
M.G's large(>10mm)n/a
Length4.15 mtr
Width2.34 mtr
Height2.12 mtr
Engine Details/Performance
Max Road Speed30 mph
Max Cross Country Speed28 mph
Range Road140 miles
Range Cross Countryunknown
Fuel TypeUnknown
Fuel Capacityunknown
Horse Power120 hp
Power/Weightunknown
General Information
The Light Tank Mk VII ICS based on the existing Light Tank and was in use from 1940.

It was armed with 1 light machine gun. Its main armament consisted of an Ordnance Q.F. 3inch Howitzer which could penetrate 84 mm of flat plate at 800 metres

The Light Tank MkVII Tetrarch was a completely new design for a light tank by Vickers, first used in 1942 then adopted for glider deployment by the Hamilcar glider.

The rear engined 120hp engine drove the tracks under the four road wheels, past the rear idler and back over the road wheels.

The turret was designed for the 3inch howitzer.

Armour Details
Turret
Front14mm@10°(14mm)
Side14mm@10°(14mm)
Rear14mm@10°(14mm)
Top4mm@90°(4mm)
Superstructure
Front14mm@45°(20mm)
Side10mm@(10mm)
Rear10mm@(10mm)
Top5mm@90°(5mm)
Hull
Front14mm@30°(16mm)
Side10mm@(10mm)
Rear10mm@(10mm)
Top5mm@90°(5mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 20 mm - Minimum 5 mm




Weapon Details
Ordnance Q.F. 3inch Howitzer
(Field Gun)
Blank
Manufacturedunknown - 1945
Calibre76.20mm
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
3 inch howitzer AP
(HE High Explosive)
76.20mm 6.3Kg 650M/Sec 0.600Kg explosive
Range(Mtr)10002000300040005000600070008000
Flight Time(Secs) 1.77 4.17 7.61 12.96 22.39 43.45 132.43
Direct Fire
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.16 0.32 0.65 1.38 2.19 3.12 4.17 5.39
Hit Probability(%) 98 98 98 90 60 25 15 6
Blast/Fragmentation Effects
Burst radius Infantry in open 99% kill3 mtr Burst radius Infantry in open 66% kill6 mtr
Burst radius Infantry in open 33% kill15 mtr  Armour Penetration inc roof at 1 mtr1 mm
An explosion within 3 mtr of infantry in the open will cause 99% casualties - lethal.
An explosion within 6 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's.
An explosion within 15 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 penetrate 1 mm of the tank armour including the roof.

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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