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Germany
Flakpanzer IV 2cm (Wirbelwind)

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Flakpanzer IV 2cm(Wirbelwind) scale illustration

General Details
Specifications
Operational Date(s)1944 - 1945
Ordnance classification
Quantity Produced86
Weightunknown
Crew5
M.G's small1
M.G's large(>10mm)n/a
Length5.95 mtr
Width2.97 mtr
Height2.77 mtr
Engine Details/Performance
Max Road Speed24 mph
Max Cross Country Speed10 mph
Range Road125 miles
Range Cross Countryunknown
Fuel TypePetrol
Fuel Capacityunknown
Horse Power300 hp
Power/Weightunknown
General Information

Armour Details
Turret
Front16mm@25°(18mm)
Side16mm@36°(20mm)
Rear16mm@18°(17mm)
Topn/a
Superstructure
Front80mm@10°(81mm)
Side30mm@(30mm)
Rear20mm@11°(20mm)
Top12mm@87°(12mm)
Hull
Front80mm@12°(82mm)
Side30mm@(30mm)
Rear20mm@(20mm)
Top10mm@90°(10mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 82 mm - Minimum 10 mm



Weapon Details
Flag
2.0cm Flak 38 L/112.5
2.0cm Flugabwehrkanone 38 L/112.5
(translates as Anti Aircraft Gun)
Blank
photo of 2.0cm Flak 38 L/112.5 from 2cm Flak 38 photo from Wikipedia
History
Originally developed for the Luftwaffe to replace the slower firing 2cm Flak 30, this became the main low level Anti Aicraft gun in the German Forces.

The Flakvierling was a four barreled version that had a rate of fire of 1680 rounds per minute and was mounted on a variety of vehicles.
ManufacturerMauser-Werke
Manufactured1940 - 1945
Calibre20mm
LengthL/112
Rate of Fire420 rpm
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
2.0cm PzGr 39(AP)
20mm 0.12Kg 899M/Sec
Quoted Penetration 23mm @ 100mtr/30° ( ≈ 26mm/0°)
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.12 0.25 0.59 1.68
Penetration(mm@30°) 18 13 9 5
Penetration(mm@0°) 21 16 11 6
Hit Probability(%) 98 98 98 81


 
2.0cm PzGr 40(APCR)
20mm 0.115Kg 1060M/Sec
Quoted Penetration 40mm @ 100mtr/0° ( ≈ 40mm/0°)
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.1 0.21 0.47 1.26 2.88 7.67
Penetration(mm@30°) 35 31 25 17 10 4
Penetration(mm@0°) 41 36 30 20 12 5
Hit Probability(%) 98 98 98 93 34 2



2 cm Sprgr. 39(HE)
20mm 0.132Kg 995M/Sec 0.006Kg explosive
Maximum Range 2000 Mtr
Range(Mtr)10002000300040005000600070008000
Flight Time(Secs) 2.03
Burst radius Infantry in open 99% kill0 mtr Burst radius Infantry in open 66% kill0 mtr
Burst radius Infantry in open 33% kill1 mtr  Armour Penetration inc roof at 1 mtr0 mm
An explosion within 0 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's.
An explosion within 1 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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