As Platapus said, it does depend on torpedo dud settings. Also, it "does" depend on where you hit the ship. I have found, the big 10k tankers, if I aim for the forward mast, and one for the aft mast, the fish that hits the forward area can sometimes cause the boat to break in two.
The large troop ships, I have found over time, if you hit them in the area of the aft engine room / boiler room, will usually end up sinking them with one hit.
Regular freighters, it depends on their cargo. If they carry munitions, they go up in a huge erecption of smoke and flames. If they carry non-volital cargo, it can take 2 to 4 torpedoes to sink them for sure.
The worst one I had, took 6 or 7 fish to finally make it go under. Waited 2 days in the area, but because it was armed both bow and stern, I couldn't surface to use the deckgun on it.
Also, I use mostly the TMO Supermod, and swith to FORTS for a different change of pace. And RFB that I tweak for personal use.
But in the end, yes, you can get a one shot one kill from time to time.
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A legislative act contrary to the Constitution is not law.
-John Marshall Chief Justice of the Supreme Court
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