All the German U-boat torpedoes in WWII were 53.3cm (21 inch) in diameter and had a warhead of 280kg (except the T5 which had 274kg). There were also two important pattern-running devices which could be applied to various torpedo types. These were FAT and LUT.
The FAT (Federapparat Torpedo) ran a wandering course with regular 180-degree turns, was useful against convoys, and was fitted to both G7a and G7e T3s. From the end of 1942 onward it was manufactured at the rate of roughly 100 per month.
Starting about mid-1944, the Lagenunabhängiger Torpedo (LUT) variation was introduced which was a more sophisticated version of FAT. LUT could be fired at any target angle and could follow a curved path to its target.
In this game I fired one at a target but it initially missed and turned around. However, in the next run it hit and sunk the ship.
In this video you can see it maneuver.
