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USSR
ISU-122

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General Details
Specifications
Operational Date(s)1944
Ordnance classification
Quantity Produced0
Weightunknown
Crew4
M.G's smalln/a
M.G's large(>10mm)1
Length8.40 mtr
Width3.15 mtr
Height2.52 mtr
Engine Details/Performance
Max Road Speed23 mph
Max Cross Country Speed14 mph
Range Road0 miles
Range Cross Countryunknown
Fuel TypeUnknown
Fuel Capacityunknown
Horse Power0 hp
Power/Weightunknown
General Information

Armour Details
Turret
Frontn/a
Siden/a
Rearn/a
Topn/a
Superstructure
Front90mm@45°(127mm)
Side90mm@30°(104mm)
Rear60mm@20°(64mm)
Top30mm@90°(30mm)
Hull
Front90mm@45°(127mm)
Side90mm@(90mm)
Rear60mm@(60mm)
Top30mm@90°(30mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 127 mm - Minimum 30 mm



Weapon Details
Flag
122mm Corps Gun M1931/1937 A19S L/45 Blank
Calibre122mm
LengthL/45
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
AP(AP)
122mm 21.7Kg 990M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.1 0.21 0.42 0.86 1.34 1.86 2.42 3.02
Penetration(mm@30°) 227 213 199 180 163 147 131 116
Penetration(mm@0°) 263 247 230 209 189 170 152 135
Hit Probability(%) 98 98 98 98 90 74 48 25

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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