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Germany's 15 cm siG33

Photos

Sturminfanteriegeschütz 33B7:
Germany's Sturminfanteriegeschütz 33B self propelled gun
Bundesarchiv, Koblenz

Design

To get more artillery to be self propelled chassis from light and medium tanks were converted to carry a 15 cm infantry gun. They were successful as they could be brought into action quicker than a horse or vehicle towed howitzer.7

Obsolete

By late 1943 these were withdrawn from combat as they were being replaced by other assault weapons.7

Production

  • 15 cm siG33 (Sf) auf PzKpfw I Ausf B: 381,2
    • Production: 19401
    • Manufacturer: Alkett2
  • 15 cm siG33 auf Fahrgestell PzKpfw II (SF): 122
    • Production: November 1941 - December 19412
    • Manufacturer: Maschinenfabrik Augsburg - Nurmberg4
  • Sturminfanteriegeschütz 33B: 127
    • Production: December 1941 - October 19422
    • Manufacturer: Alkett2

Variants

  • 15 cm siG33 (Sf) auf PzKpfw I Ausf B; GW 1 für 15cm sIG 33; 15cm sIG 33 auf Geschuetzwagen I Ausf B: Alkett converted 38 PzKpfw I Ausf B in mid 1939.5 Had entire carriage and wheels of 150 mm howitzer mounted.7,8 Had shield to partially protect crew.7,8
  • 15 cm siG33 auf Fahrgestell PzKpfw II (SF); 15cm sIG 33 auf Fgst PzKpfw II (Sf) Verlaengert; GW II für 15cm sIG 33: Used a modified PzKpfw II chassis.8 It was widened and lengthened and an additional wheel was added.7 Range of 4,700 meters. The 150 mm gun could fire a 36.8 lb HE shell at a muzzle velocity of 790'/sec.4
  • Sturminfanteriegeschütz 33B, 15 cm s.I.G. 33 on PzKpfw III; Sturm-Infantriegerschütz 33B Sfl; 15cm sIG 33 auf Pz III; StuIG 33 auf Fgst PzKpfw III: Made from PzKpfw III chassis.7 Howitzer was completely enclosed.7

Usage

15 cm siG33 (Sf) auf PzKpfw I Ausf B

Used in Poland, France in 1940, and in Russia.7 Equipped sIG Kompanien (heavy infantry gun companies) 701-706 and were used in Belgium, Holland, and France in 1940. The last ones in service were with the 704th schwere Infanteriegeschütz Abteilung of the 5th Panzer Division in Russia in mid-1943.

15 cm siG33 auf Fahrgestell PzKpfw II (SF)

All were shipped to North Africa in 1942 to the 707 and 708 sIG Kp (SF) (heavy infantry gun companies). Took part in the Gazala spring offensive.

Specifications

  15 cm siG33 (SF) auf PzKpfw I Ausf B
Crew 41,2,3,7,8
Radio  
Physical Characteristics  
Weight 25,300 lb8, 25,353 lb3
8,500 kg1, 11,500 kg3, 11,505 kg8
8.35 tons1, 8.5 tons2,5,7
Length 15' 3.8"1, 15' 10.4"3,8
4.67 m1,2, 4.835 m3,8
Height 7' 10.5"3,8, 9' 2.2"1,
2.4 m3,8, 2.8 m1,2
Width 6' 9"1, 7' 0.6"8, 7' 10.5"3
2.06 m1,2, 2.15 m8, 2.4 m3
Width over tracks  
Ground clearance  
Ground contact length  
Ground pressure  
Turret ring diameter  
Armament  
Main 1: 150 mm sIG338
1: 150 mm sIG33 L/112
1: 150 mm Howitzer1,3
Secondary  
MG  
Side arms  
Quantity  
Main 25
Secondary  
MG  
Side arms  
Armor Thickness (mm) 6 - 138, 131
Hull Front, Upper 13@22°2
Hull Front, Lower 13@27°2
Hull Sides, Upper 13@22°2
Hull Sides, Lower 13@0°2
Hull Rear 13@0°2 & 13@19°2
Hull Top 6@83-90°2 & 6@90°2
Hull Bottom 6@90°
Turret Front 10@0-25°2
Turret Sides 10@0°2
Turret Rear open2
Turret Top open2
Engine (Make / Model) Maybach NL38TR1,2
Praga3,8
Bore / stroke  
Cooling  
Cylinders 63,8
Capacity  
Net HP 1503,8
Power to weight ratio  
Compression ratio  
Transmission (Type) 5 forward, 1 reverse.2
Steering  
Steering ratio  
Starter  
Electrical system  
Ignition  
Fuel (Type) Gasoline8
Octane  
Quantity  
Road consumption  
Cross country consumption  
Performance  
Traverse 12.5° left, 12.5° right2, hand2
Speed - Road 21.75 mph3,8, 24.9 mph1
35 kph3,8, 40 kph1,2
Speed - Cross Country  
Range - Road 87 miles1, 115 miles3,8
140 km1,2, 185 km3,8
Range - Cross Country  
Turning radius  
Elevation limits -4° to +75°2
Fording depth 3'3,8
0.914 m3,8
Trench crossing 5' 9"8
1.75 m8
Vertical obstacle 1' 5"8
0.42 m8
Climbing ability  
Suspension (Type)  
Wheels each side  
Return rollers each side  
Tracks (Type)  
Length  
Width  
Diameter  
Number of links  
Pitch  
Tire tread  
Track centers/tread  
  15 cm siG33 auf Fahrgestell PzKpfw II (SF)
Crew 42, 54,7
Radio FuG Spr f2
Physical Characteristics  
Weight 25,088 lb, 24,692 lb
11.2 tons2, 12 tons4,7
Length 15' 2.75"4, 17' 9", 18'
5.41 m2
Height 5' 3"4, 6' 2.75", 6' 4"
1.9 m2
Width 7' 4"4, 8' 6", 8' 8"
2.6 m2
Width over tracks  
Ground clearance 13"4
Ground contact length 94"4
Ground pressure  
Turret ring diameter  
Armament  
Main 150 mm sIG33 L/11
150 mm sIG33 L/122
150 mm Gun Model 19334
Secondary  
MG  
Side arms  
Quantity  
Main 302
Secondary  
MG  
Side arms  
Armor Thickness (mm)  
Hull Front, Upper 0.6"@0°4, 30@9°2
Hull Front, Lower 30@15°2
Hull Sides, Upper 0.6"@0°4, 15@30°2
Hull Sides, Lower 15@0°2
Hull Rear 0.6"@0°4, 15@10°2 & 15@15°2
Hull Top 5@90°2
Hull Bottom 5@90°2
Turret Front 15@10°2
Turret Sides 15@30°2
Turret Rear open2
Turret Top open2
Engine (Make / Model) Maybach HL 62 TRM2
Maybach HL62 TR4
Bore / stroke  
Cooling Water4
Cylinders 64
Capacity  
Net HP 1404
Power to weight ratio  
Compression ratio  
Transmission (Type) Synchromesh4
6 forward, 1 reverse2,4
Steering Clutch brake4
Steering ratio  
Starter  
Electrical system  
Ignition  
Fuel (Type) Gasoline4
Octane  
Quantity 52 gallons4
Road consumption  
Cross country consumption  
Performance  
Traverse 25°,
10°, hand2
Speed - Road 30 mph4
40 kph2
Speed - Cross Country  
Range - Road 120 miles4
160 km2
Range - Cross Country  
Turning radius  
Elevation limits +50°, -0° to +73°4
Fording depth 3'4
Trench crossing 6'4
Vertical obstacle 1' 6"4
Climbing ability 35° slope4
Suspension (Type) Independent leaf spring4
Wheels each side 5 bogie wheels4, 6
Return rollers each side 44
Tracks (Type) Steel, skeleton type with floating pin4
Length  
Width 11 1/8"4
Diameter  
Number of links 1054
Pitch 3 5/8"4
Tire tread  
Track centers/tread 74"4
  siG 33B
Crew 52,7
Radio FuG Spr d2
Physical Characteristics  
Weight 21 tons2, 22 tons7
Length 5.4 m2
Height 2.3 m2
Width 2.9 m2
Width over tracks  
Ground clearance  
Ground contact length  
Ground pressure  
Turret ring diameter  
Armament  
Main 150 mm Stu I G L/112
Secondary  
MG 7.92 mm MG342
Side arms  
Quantity  
Main 302
Secondary  
MG 6002
Side arms  
Armor Thickness (mm)  
Hull Front, Upper 80@10°2
Mantlet: 30@10°2
Hull Front, Lower 30+50 or 50@21°2
Hull Sides, Upper 50@25°2
Hull Sides, Lower 30@0°2
Hull Rear 15@0°2 & 30 or 50@10°2
Hull Top 10@90°2 + 17@11-90°2
Hull Bottom 16@90°2
Turret Front  
Turret Sides  
Turret Rear  
Turret Top  
Engine (Make / Model) Maybach HL120TRM2
Bore / stroke  
Cooling  
Cylinders  
Capacity  
Net HP  
Power to weight ratio  
Compression ratio  
Transmission (Type) 6 forward, 1 reverse.2
Steering  
Steering ratio  
Starter  
Electrical system  
Ignition  
Fuel (Type)  
Octane  
Quantity  
Road consumption  
Cross country consumption  
Performance  
Traverse 3° left, 3° right2
Speed - Road 20 kph2
Speed - Cross Country  
Range - Road 110 km2
Range - Cross Country  
Turning radius  
Elevation limits -3° to +25°2
Fording depth  
Trench crossing  
Vertical obstacle  
Climbing ability  
Suspension (Type)  
Wheels each side  
Return rollers each side  
Tracks (Type)  
Length  
Width  
Diameter  
Number of links  
Pitch  
Tire tread  
Track centers/tread  

Sources:

  1. The Encyclopedia of Tanks and Armored Fighting Vehicles - The Comprehensive Guide to Over 900 Armored Fighting Vehicles From 1915 to the Present Day, General Editor: Christopher F. Foss, 2002
  2. Encyclopedia of German Tanks of World War Two, Peter Chamberlain and Hilary Doyle, 1999
  3. The Encyclopedia of Weapons of World War II, Chris Bishop, 1998
  4. Tank Data 2, Aberdeen Proving Grounds Series, E. J. Hoffschmidt and W. H. Tantum IV, 1969
  5. German Tanks of World War II, Dr. S. Hart & Dr. R. Hart, 1998
  6. German Tanks and Armoured Vehicles 1914 - 1945, B. T. White, 1966
  7. Profile, AFV Weapons #55, German Self-Propelled Weapons, Peter Chamberlain, H.L. Doyle, 1973
  8. Armored Fighting Vehicles, 300 of the World's Greatest Military Vehicles, Philip Trewhitt, 1999
20th Century American Military History Crucial Site