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Antitank SP17pdr M10 (Achilles)

General Details
Specifications
Manufacture Date(s)1944
Quantity Produced1100
Weight29.6 tonne
Crew5
M.G's small1
M.G's large(>10mm)1
Length6.03 mtr
Width3.08 mtr
Height2.49 mtr
Engine Details/Performance
Max Road Speed32 mph
Max Cross Country Speed20 mph
Range Road322 miles
Range Cross Country186 miles
Fuel TypeUnknown
Fuel Capacity165 gal
Horse Power375 hp
Power/Weight12 hp/kg
General Information
The Achilles was a British modification to the American M10 Tank Destroyer utilising the 17pdr gun instead of the American 3" (76.2 mm) Gun M7, which improved the anti-tank capability significantly.

The turret was open topped making it vulnerable to high explosives and grenades, and was manually rotated, so was slow to change directions.

The basis for the design was a version of the American M10 Sherman tank with reduced armour.

Armour Details
Turret
Front57mm@45°(81mm)
Side25mm@75°(97mm)
Rear25mm@0°(25mm)
Top19mm@90°(19 mm)
Superstructure
Front38mm@35°(46mm)
Side19mm@52°(31mm)
Rear19mm@52°(31mm)
Top19mm@90°(19 mm)
Hull
Front51mm@34°(62mm)
Side25mm@0°(25mm)
Rear25mm@0°(25mm)
Top13mm@90°(13 mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 97 mm - Minimum 13 mm


Weapon Details
Bren Gun
History

The Bren gun was licenced from the Czechoslovak ZB vz.27 light machine gun which was designed and manufactured in Brno from 1935. It fired the standard British .303 rifle round.

Manufactured1930 - 2004
Calibre7.70mm
LengthL/82
Rate of Fire500rpm
 
Ammunition Details
Name/Id Calibre Weight MVelocity Quoted Penetration
 
Standard british .303 round - HPBT(MG) 7.70mm 0.01Kg   761M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.17 0.4 1.33
Penetration(mm) 11 9 5
Hit Probability(%) 98 98 90
 
Standard british .303 round -(MG) 7.70mm 0.01Kg   783M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.17 0.4 1.33
Penetration(mm) 11 9 5
Hit Probability(%) 98 98 90
0.5 inch Browning Machine Gun M2
Calibre12.70mm
Rate of Fire480rpm
Rounds Carried 420
 
MG(MG) 12.70mm 0.04Kg   884M/Sec 22mm@100m
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.13 0.28 0.67 2.46
Penetration(mm) 22 20 16 8
Hit Probability(%) 98 98 98 48
Ordnance Q.F. 17pdr
Manufactured1942 - unknown
Calibre76.20mm
LengthL/55
Rounds Carried 50
 
AP(AP) 76.20mm 7.65Kg   950M/Sec 130mm@915m
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.11 0.22 0.44 0.94 1.5 2.13 2.85 3.69
Penetration(mm) 137 135 132 124 117 110 102 95
Hit Probability(%) 98 98 98 98 88 60 34 22
 
APC(APC) 76.20mm 7.71Kg   883M/Sec 130mm@915m
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.11 0.23 0.48 1.01 1.61 2.29 3.07 3.97
Penetration(mm) 128 127 123 116 110 103 96 89
Hit Probability(%) 98 98 98 98 81 57 25 22

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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