Depends on the size and thus value of a target.
First of all, for me it depends on the date.If before mid 1943, I fire alot, small merchant or tanker gets at least two, mid or large gets four due to high rate of duds and premature explosions.
Second, depends on the size and thus value of a target.The small merchants 1-2 torpedos, placed at different spots.
Medium Merchants- usually 3 torpedos for good measure.
Large Merchant/Tanker or Troop ship 4 torpedos.
Large target like Conte Verde Liner, carrier, battleship etc, every torpedo I can until shes sinking.Usually an intitial salvo of 6 from bow tubes, if cant do the job, will use sterns.
I also aim the shots to hit vital places on target.For example
A mid sized merchant, classic 90 degree shot, I place the wire at bearing zero, when the middle of the ship, where the stack is usually at, I place the fire there and hit "send bearing to TDC" button, then immediately fire.I then place the wire forward behind the forward mast where a cargo hold usually is, wait 10 seconds, send bearing and fire, place wire just ahead of the bridge structure...wait 10 seconds, fire 3.
If calm seas I set the torpedo going to hit under the stack amidships to 3 feet, minimum depth you can set, it hits at water line, helps blow the boiler up and flood them real nice.Set others for different depths.
Tankers weak point is to hit them under their stack which is aft with a fish set for 8-10 feet, cant take down even the 10k ton tanker Nippon Maru with one fish if you hit it right under the stack, plus it destroys its engines and goes dead in water.
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