Developed on the basis of the SU-14. In 1936 a prototype was manufactured and tested. In 1937 the project supervisor was purged and the project was canceled. The prototype was shipped to Kubinka for storage. In 1941, during the Battle of Moscow, the SU-14-1 was used for long-range bombardment.
Time for the successive autoreloading of each shell into the magazine.
The technical characteristics shown are for the Siege mode
Characteristics are specified for a vehicle with crew members trained to 100%.