Germany
7.62cm Pak 36(r) Gw 38(t) (Marder III)
Ordnance classification - SdKfz 139

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The 7.62cm Pak 36(r) Gw 38(t) was designed in 1941, manufactured by Böhmisch-Mährische Maschinenfabrik AG based on the existing fully tracked Czech LT Vz 38 and was in use from 1942 to 1945.

General Details Specifications Operational Date(s) 1942 - 1945 Ordnance classification SdKfz 139 Quantity Produced 363 Weight 10.67 tonne Crew 4 M.G's small 1 M.G's large(>10mm) n/a Length 4.61 mtr Width 2.14 mtr Height 2.40 mtr Engine Details/Performance Max Road Speed 25 mph Max Cross Country Speed 15 mph Range Road 116 miles Range Cross Country 46 miles Fuel Type Petrol Fuel Capacity unknown Horse Power 125 hp Power/Weight 11 hp/tonne General Information The 7.62cm Pak 36(r) Gw 38(t) was designed in 1941, manufactured by Böhmisch-Mährische Maschinenfabrik AG based on the existing fully tracked Czech LT Vz 38 and was in use from 1942 to 1945. The vehicle was powered by Praga 'EPA/2' petrol powerplant producing 125 HP which could drive the vehicle on roads at up to 25 mph with a range of about 116 miles before refuelling. Its cross country performance was good providing a max speed of about 15 mph and a range of about 46 miles. It was armed with 1 light machine gun. Its main armament consisted of a 7.62cm Pak 36(r) L/51 which could penetrate 143 mm of flat plate at 200 metres Armour Details Turret Front 11mm @ 31° (13mm) Side 11mm @ 12° (11mm) Rear n/a Top n/a Superstructure Front 50mm @ 17° (52mm) Side 16mm @ 12° (16mm) Rear 10mm @ 65° (24mm) Top 10mm @ 90° (10mm) Hull Front 50mm @ 16° (52mm) Side 15mm @ 0° (15mm) Rear 15mm @ 16° (16mm) Top 18mm @ 90° (18mm) Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 52 mm - Minimum 18 mm

Weapon Details 7.62cm Pak 36(r) L/51 7.62cm Panzerabwehrkanone 36(r) L/51 (translates as Anti Tank Gun) History This was the Soviet 7.62 1936 model many of which were captured in the early weeks of the Russian campaign and bored out to take the 7.5cm Pak 40 cartridge together with an added muzzle break. Manufactured 1942 - unknown Calibre 76.20mm Length L/51 Rate of Fire 12 rpm   Ammunition Details Name/Id Calibre Weight MVelocity Explosive Content 7.62cm Pzgr Patr 39 (AP Armor Piercing) 76.20mm 7.54Kg 740M/Sec Quoted Penetration 98mm @ 500mtr/30° ( ≈ 113mm/0°) Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.14 0.28 0.57 1.21 1.93 2.74 3.66 4.73 Penetration(mm@30°) 133 123 112 99 86 75 64 54 Penetration(mm@0°) 154 143 130 115 100 87 74 63 Hit Probability(%) 98 98 98 93 69 39 22 8 7.62cm Sprgr Patr 39 (AP40 Armour Piercing Tungsten Cored) 76.20mm 4.07Kg 990M/Sec Quoted Penetration 118mm @ 500mtr/30° ( ≈ 136mm/0°) Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.1 0.21 0.44 0.95 1.55 2.28 3.18 4.3 Penetration(mm@30°) 161 148 132 112 94 77 62 49 Penetration(mm@0°) 187 171 153 130 109 90 72 57 Hit Probability(%) 98 98 98 98 85 57 25 15 7.62cm Sprgr Patr 39 (HE High Explosive) 76.20mm 6.03Kg 450M/Sec 0.550Kg explosive Maximum Range 9000 Mtr Range(Mtr) 500 1000 1500 2000 2500 3000 3500 4000 Flight Time(Secs) 1.22 2.72 4.58 6.99 10.19 14.67 21.4 32.59 Direct Fire Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.23 0.46 0.96 2.08 3.41 5.01 6.99 9.47 Hit Probability(%) 98 98 98 64 25 6 3 1 Blast/Fragmentation Effects Burst radius Infantry in open 99% kill 3 mtr Burst radius Infantry in open 66% kill 6 mtr Burst radius Infantry in open 33% kill 15 mtr  Armour Penetration inc roof at 1 mtr 1 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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