C7P

The C7P was an abbreviation of Ciagnik Siedmiotonowy Polski, which meant 7-tonnes Polish Tractor. It was developed between 1931 and 1934 by the design bureau of Witold Jakusz of the PZInz Company. The vehicle was used by the Polish Army before and during World War II as a tracked artillery tractor.

Two prototypes called C6P and C6T were built in 1933 and constructed in the Ursus factory of the PZInz Company. The engine of the C6P was placed in front and used front wheel drive. On the other hand, the engine of the C6T was placed behind the crew compartment and used rear wheel drive. After several trials, the C6P was selected as the better prototype which was later redesigned as the C7P.

The tractor could fit a crew of 8 people. It weighed 8.5 tonnes and was 4.60 m in length, 2.40 m in width and 2.40 m in height. The PZInz 235 diesel engine provided 115 hp. It had leaf spring bogie suspension. The operational range was 150 km and speed was 26 km/h. It also included a closed crew compartment and motor-driven winch.

At the start of the Second World War, only a total of 151 units were built. Most of the tractors were sold to the artillery units and used as an artillery tractor, primarily for towing heavy 220 mm wz.32 Skoda mortars. In 1939, all C7P tractors were used throughout the Polish defensive war. Most of the tractors were captured and used by the Germans as towing machines and snowploughs up to 1941. After the war, there was no surviving model of the tractor.