Are your torpedo doors OPEN before you pressed the FIRE button? If not, the game engine will delay the launch while it opens the door. That delay can be enough to make you miss astern.
Assuming the doors are open, try one of these solutions to see exactly what's going on:
1) turn on the Event Camera in the Realism settings. Watch the eel as it runs to the target. See what happens when it gets there.
2) Turn off Dud Torpedoes in the Realism settings. After firing, press F6 and watch the torpedo icon move towards the target. See what happens when it gets there. You can see if it goes under the ship without hitting it, hits the curve of the keel and is deflected without exploding, or hits the target but simply fails to explode.
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Raptor
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