Just FYI, if you take the stock damage model, lower the torpedo damage to like 25 to 30, or 30 to 35, then increase the radius to 7 min, 7 max, ive found that two contact hits, 95% of the time will not result in a sinking. Two magnetic hits under the keel resulted in a sinking 98% of the time. Exception being small ships like a tramp steamer. 1 contact hit did nicely.
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