Torpedo types and stats
Torpedo
Propulsion
Range km
Guidance
Speed kn
G7a TI
Steam
7.5 km
Straight running
30/40/44 kn
G7e TII
Electric
5 km
Straight running
30 kn
G7e TIII
Electric
7.5km
Straight running
30 kn
G7e TIV
Electric
7.5km
Guided
20 kn
G7es TV
Electric
6.5km
Guided
25 kn
FAT (Federapparat)
The TI and TIII torpedo types have modified variants which incorporate the FAT (Federapparat) system. The system allows the torpedoes to go in a search pattern if they miss their intended target.
To activate the system set the system activation range (on the stern of the torpedo). The range should be beyond the target range (so the torpedo passes the target before going into the search pattern). The system allows you to set the direction of the search pattern. If the FAT direction switch is off the torpedo will start the search pattern going from left to right, if the button is on the search pattern will be from right to left.
Torpedo maintenance
There are two main things to keep in mind when maintaining the torpedoes. Damage and charge.
Damage is self explanatory, a damaged torpedo is unlikely to work properly so make sure they don't get damaged and if they do make sure to repair them.
Recharging torpedoes
The electric torpedoes need to be recharged from time to time, this is an intended feature. You don't really have to worry about it, but if you are doing a long sub-hunt or just playing around for multiple hours recharging the torpedoes becomes quite important.