It took me 5 torpedos last time I sunk a Nelson class. Normally I go for 1m underkeel shots, but the seas were very rough and torpedos have a habit of either banging off the hull or whizzing on under in such bad weather. First I hit it 3 times with torpedos set at 3m depth on impact triggers. This brought it to a dead stop and the bow went under, but the ship was still afloat. After the escorts left, I hit it with one more torpedo towards the rear and it still didn't go under. The fifth hit finally did the trick.
Pretty tough considering I've taken down the Hood with 2 torpedos (in GWX 2.0) and I just took down an Illustrious class carrier with 3 torpedos during the same campaign.
Generally 3 hits seems to at least slow a large ship down enough to where the rest of the task force leaves it behind and you can set up for the killing blow. I've seen Revenge or Nelson class BB's keep on going at 20kts after 4 hits though, so you can never be sure.
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