Britain Cruiser Mk I (A9) Ordnance classification - A9
The Cruiser Mk I was designed in 1936, manufactured by Vickers Armstrong and was in use from 1937 to 1941.
General Details
Specifications
Operational Date(s)
1937 - 1941
Ordnance classification
A9
Quantity Produced
125
Weight
12 tonne
Crew
6
M.G's small
3
M.G's large(>10mm)
n/a
Length
5.92 mtr
Width
2.56 mtr
Height
2.56 mtr
Engine Details/Performance
Max Road Speed
25 mph
Max Cross Country Speed
13 mph
Range Road
150 miles
Range Cross Country
60 miles
Fuel Type
Petrol
Fuel Capacity
86 gal
Horse Power
150 hp
Power/Weight
12 hp/tonne
General Information
The Cruiser Mk I was designed in 1936, manufactured by Vickers Armstrong and was in use from 1937 to 1941.
The vehicle was powered by Associated Equipment Company(AEC) 'AEC 179 6-cylinder' petrol powerplant producing 150 HP which could drive the vehicle on roads at up to 25 mph with a range of about 150 miles before refuelling. Its cross country performance was good providing a max speed of about 13 mph and a range of about 60 miles.
It was armed with 3 light machine guns which were Vickers Medium Machine Guns. Its main armament consisted of an Ordnance Q.F. 2pdr which could penetrate 59 mm of flat plate at 400 metres
The turret had power traverse with a 2pdr A/T gun and a Vickers machine gun. The vehicle also had two auxillliary machine gun turrets housing Vickers machine guns.
Armour Details
Turret
Front
14mm
@
20°
(15mm)
Side
12mm
@
20°
(13mm)
Rear
14mm
@
20°
(15mm)
Top
4mm
@
90°
(4mm)
Superstructure
Front
14mm
@
45°
(20mm)
Side
10mm
@
0°
(10mm)
Rear
10mm
@
0°
(10mm)
Top
5mm
@
90°
(5mm)
Hull
Front
14mm
@
30°
(16mm)
Side
10mm
@
0°
(10mm)
Rear
10mm
@
0°
(10mm)
Top
5mm
@
90°
(5mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 20 mm - Minimum 5 mm
Weapon Details
Vickers Medium Machine Gun
History
The Vickers medium machine gun was designed during World War I as a replacement for the Maxim gun from which its design was taken.
It served throughout World War I and II as a fixed point machine gun used to suppress areas and act as a defensive point.
Manufacturer
Vickers
Manufactured
1912 - 1968
Calibre
7.70mm
Length
L/93
Rate of Fire
450 rpm
Number of Rounds
3000
Ammunition Details
Name/Id
Calibre Weight MVelocity
Explosive Content
Standard british .303 round - MkVIII (only used in Vickers Mg)(MG)
7.70mm 0.01Kg 844M/Sec
Range(Mtr)
100
200
400
800
1200
1600
2000
2400
Flight Time(Secs)
0.14
Penetration(mm@30°)
2
Penetration(mm@0°)
3
Hit Probability(%)
98
Weapon Details
Ordnance Q.F. 2pdr
History
Used both as an Anti Tank gun and as a Tank gun the 2pdr was first used in Belgium in 1939. The majority of the British guns were captured by the Germans at Dunkirk and given their designation of 4.0 cm Pak 192(e) or 4.0 cm Pak 154(b). However the 2pdr manufacture was continued but was slowly replaced by the 6pdr from 1942.
Manufactured
1936 - 1944
Calibre
40mm
Length
L/50
Rate of Fire
22 rpm
Number of Rounds
100
Ammunition Details
Name/Id
Calibre Weight MVelocity
Explosive Content
AP(AP)
40mm 1.08Kg 792M/Sec
Quoted Penetration 53mm@455m
Range(Mtr)
100
200
400
800
1200
1600
2000
2400
Flight Time(Secs)
0.13
0.27
0.56
1.26
2.17
3.37
5.06
7.58
Penetration(mm@30°)
64
58
51
41
33
25
19
13
Penetration(mm@0°)
74
67
59
48
39
30
22
16
Hit Probability(%)
98
98
98
93
60
25
6
2
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.