Another possible reason is that your torpedos have not run past the safe distance before they impact the target.
If you fire from too close to the target, the torpedos will not arm. I think the topredo needs to run at least about 300m. (IRL it varied with torpedo type.)
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100% realism, DiD
Harbor Traffic 1.47(incl. RUB)
Using SH3 Commander to implement many custom realism tweaks
Covered 1939-1945; now restarting in 1939 again.
Completed 39 careers, 210 war patrols, 4.7Mt sunk, 19 subs lost
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