This version of the Sturmgeschütz is similar to its predecessor, the Stu. G. 7.5 cm K., except for its armament. The 7.5 cm Kw.K. short gun which appeared in the original Sturmgeschutz was replaced by the 7.5 cm Stu. G. lg. K., 87 inches long as shown above. The arrangement of the recoil mechanism also differs, the long version having what appears to be the original mounting provided for the Kw.K. 40 and is evidently a forerunner in its design and development. Photographs show the 7.5 cm Stu. G. lg. K. to be equipped at times with a muzzle brake. The front superstructure has been modified to accommodate the improved armament.
This vehicle is made up of the Pz. Kpfw. III tank chassis and an early development of the 7.5 cm Pak 40, and includes the hull and superstructure improvements made at this time on the original Sturmgeschütz. A roof was added, a commander’s cupola, smoke pot projectors and heavier front plate. The piece represents the trend in design from the short barrel 7.5 cm Kw.K. to the Stu. K. 40.
SPECIFICATIONS
| Weight | 21 tons | |
| Length | 17 ft., 9 ins. | |
| Width | 9 ft., 7 ins. | |
| Height | 6 ft., 5 ins. | |
| Ground clearance | 15 ins. | |
| Tread centers | 8 ft., 2 1/2 ins. | |
| Ground contact | 9 ft., 4 1/2 ins. | |
| Width of track | 15 ins. | |
| Pitch of track | 4 3/4 ins. | |
| Track links | 90 | |
| Fording depth | 3 ft. | |
| Theoretical radius of action | ||
| Roads | 100 miles | |
| Cross-country | 60 miles | |
| Speed | ||
| Roads | 25 m.p.h. | |
| Cross-country | 15 m.p.h. | |
| Armor | ||
| Front plate | 50 mm | |
| Sides | 30 mm | |
| Armament | 7.5 cm lg. Kw.K. | |
| Ammunition | 84 rds. | |
| Engine | Maybach HL 120 TRM, 320 hp. | |
| Transmission | 6 speeds forward, 1 reverse | |
| Steering | Epicyclic clutch brake | |
| Crew | 4 |
German: p. 27