15 cm siG33 (Sf) auf PzKpfw I Ausf B:

Germany's sIG33 PzKpfw I Ausf B Self Propelled Gun

Germany's siG33

siG33 with 10th Panzer Division
Germany's siG33

Alkett converted 38 PzKpfw I Ausf B in mid 1939.5

Had entire carriage and wheels of 150 mm howitzer mounted. Had shield to partially protect crew.

Used in Poland, France in 1940, and in Russia. 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):

Germany's sIG33 PzKpfw II Self Propelled Gun

Germany's sIG33 PzKpfw II Self Propelled Gun

Used a modified PzKpfw II chassis. It was widened and lengthened and an additional wheel was added. 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. Range of 4,700 meters. Used FuG Spr f radio.2

The 150 mm gun could fire a 36.8 lb HE shell at a muzzle velocity of 790'/sec.6

Sturminfanteriegeschütz 33B:

Germany's sIG 33 B Self Propelled Gun
(Bundesarchiv, Koblenz)

Made from PzKpfw III chassis. Used FuG Spr d radio.2

  15 cm siG33 (SF) auf PzKpfw I Ausf B 15 cm siG33 auf Fahrgestell PzKpfw II (SF) siG 33B
Crew 41,2,3 42, 56 52
Physical Characteristics      
Weight 19,040 lb, 18,739 lb, 25,353 lb3
8,500 kg1, 11,500 kg3
8.35 tons1, 8.5 tons2,4,5
25,088 lb, 24,692 lb
11.2 tons2, 12 tons6
21 tons2
Length w/gun 14' 6", 15' 8.75", 15' 3.8"1, 15' 10.4"3
4.67 m1,2,4, 4.835 m3
15' 2.75"6, 17' 9", 18'
5.41 m2
5.4 m2
Length w/o gun      
Height 7' 10.5"3, 8' 4.5", 9' 2", 9' 2.2"1,
2.4 m3, 3.35 m, 2.8 m1,2,4
5' 3"6, 6' 2.75", 6' 4"
1.9 m2
2.3 m2
Width 6' 9"1, 7' 10.5"3
2.06 m1,2,4, 2.4 m3
7' 4"6, 8' 6", 8' 8"
2.6 m2
2.9 m2
Width over tracks      
Ground clearance   13"6  
Ground contact length   94"6  
Ground pressure      
Turret ring diameter      
Armament      
Main 150 mm sIG33 L/112
150 mm1
150 mm Howitzer3
150 mm sIG334
150 mm sIG33 L/11
150 mm sIG33 L/122
150 mm Gun Model 19336
150 mm Stu I G L/112
Secondary      
MG     7.92 mm MG342
Side arms      
Quantity      
Main 25 302 302
Secondary      
MG     6002
Side arms      
Armor Thickness (mm) 131
Front: 134
Side: 134
   
Hull Front, Upper 13@22°2 0.6"@0°6, 30@9°2 80@10°2
Mantlet: 30@10°2
Hull Front, Lower 13@27°2 30@15°2 30+50 or 50@21°2
Hull Sides, Upper 13@22°2 0.6"@0°6, 15@30°2 50@25°2
Hull Sides, Lower 13@0°2 15@0°2 30@0°2
Hull Rear 13@0°2 & 13@19°2 0.6"@0°6, 15@10°2 & 15@15°2 15@0°2 & 30 or 50@10°2
Hull Top 6@83-90°2 & 6@90°2 5@90°2 10@90°2 + 17@11-90°2
Hull Bottom 6@90° 5@90°2 16@90°2
Turret Front 10@0-25°2 15@10°2  
Turret Sides 10@0°2 15@30°2  
Turret Rear open2 open2  
Turret Top open2 open2  
Engine (Make / Model) Maybach NL38TR1,2
Praga3
Maybach HL 62 TRM2
Maybach HL62 TR6
Maybach HL120TRM2
Bore / stroke      
Cooling   Water6  
Cylinders 63 66  
Capacity      
Net HP 1004, 1503 1406  
Power to weight ratio      
Compression ratio      
Transmission (Type) 5 forward, 1 reverse.2 Synchromesh6
6 forward, 1 reverse2,6
6 forward, 1 reverse.2
Steering   Clutch brake6  
Steering ratio      
Starter      
Electrical system      
Ignition      
Fuel (Type)   Gasoline6  
Octane      
Quantity   52 gallons6  
Road consumption      
Cross country consumption      
Performance      
Traverse 12.5° left, 12.5° right2,4, hand2 25°,
10°, hand2
3° left, 3° right2
Max speed 21.75 mph3, 24.9 mph1
35 kph3, 40 kph1,2,4
30 mph6
40 kph2
20 kph2
Cross country speed      
Road radius 87 miles1, 115 miles3
140 km1,2, 185 km3
120 miles6
160 km2
110 km2
Cross country radius      
Turning radius      
Elevation limits -4° to +75°2,4 +50°, -0° to +73°6 -3° to +25°2
Fording depth 3'3
0.914 m3
3'6  
Trench crossing   6'6  
Vertical obstacle   1' 6"6  
Climbing ability   35° slope6  
Suspension (Type)   Independent leaf spring6  
Wheels each side   5 bogie wheels6, 6  
Return rollers each side   46  
Tracks (Type)   Steel, skeleton type with floating pin6  
Length      
Width   11 1/8"6  
Diameter      
Number of links   1056  
Pitch   3 5/8"6  
Tire tread      
Track centers/tread   74"6  
Production 1940: 381
Converted in 2/1940: 382
Chassis #s: 10478-165002
Alkett2
11/1941-12/1941: 122
1942: Maschinenfabrik Augsburg - Nurmberg6
Alkett2
12/1941-10/19422
Chassis #s: 90751-910362, 91401-917502

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. Jane's World War II Tanks and Fighting Vehicles The Complete Guide, Leland Ness, 2002
  5. German Tanks of World War II, Dr. S. Hart & Dr. R. Hart, 1998
  6. Tank Data 2, Aberdeen Proving Grounds Series, E. J. Hoffschmidt and W. H. Tantum IV, 1969
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