10-15k ton ships should take just 2 torpedoes. they may not sink for over an hour, but they will sink.
anything below 10k tons i use just one torp.
anything above 15k i may use up to 4.
always try to spread out your torpedo hits, you do not get any 'bonus' for hitting the same spot twice. it is also far more difficult for damage control to stop the flooding if there are two areas being flooded.
in addition to those 'sweespots' mentioned in posts above, its always good to get a hit on the bow of a ship, as the ships movement will supposedly push more water in, and cause it to dig its nose into the water, slowing it down quickly.
never use impact torpedoes on battleships. battleships have torpedo belts which are basically an extra layer of armor below the waterline to detonate torpedoes before they hit the hull, resulting in no damage to the battleship. torpedo belts are already filled with water, so its not like they can be flooded. always use magnetic pistol, and do it in good weather so that you can get at least 3 torpedoes under the BB, which should guarantee a kill.
many escort carriers are actually converted merchant ships, for example the bogue class carrier is a C2 merchant. so treat them not as a warship when choosing where to hit, but actually as a merchant.
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