That s the type of question to which there is no definitive answer. Are you playing SH3 unmodded or modded? It's possible to sink it with one, yet another time four can't do the job. As in real life, there are no certainties. You'll have to experiment in game or in a mission, and make note of the variables of your attack, such as the type of torpedoes, pistols, depths, weather, etc. In general, which covers a lot of latitude, three to four should do it, but there will be circumstances where less or more will be required. Even if you fail to sink it with your first salvo, it will most likely stop or reduce speed to the extent that should you survive the wrath of her escorts, you'll get another shot at her. Since you so rarely encounter such a valuable target at sea, I'd give it all four tubes. How many times does a Kaleun get a BB in his sights? Herr Doenitz will forgive your liberal usage of precious torpedoes, but is less likely to forgive you if you fail to sink it due to miserly usage of ordnance.
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