Seems that UK and Italy are really out there with the torpedo problems (or lack thereof). Does anyone know how were the French or Soviet torps doing? Probably not much evidence either way, but Soviets would probably get some things from the Italians in 1930s?
The USSR got Italian 45 and 53cm torps in 1932 and based their own designs on them.
The French 53cm V/24 is described as reliable but the gyroscopes were only ok for shots straight ahead but not for angled shots. The French mitigated this problem by using pivoting tubes.
edit: Info from: "U-Boats in WW2" by Erminio Bagnasco and Navweaps.
Edited by Markus Becker, 15 June 2017 - 0557 AM.