If you're getting weird variations in target speed, it is likely that your sub is still moving while you're tracking your target. You have to be stationary, if possible. Also, it's ideal to fire with the Gyro angle being 000 degrees, but +-20 degrees is acceptable. Anything beyond that increases the risk of failure. You also have to strike the hull perpendicularly, or the firing pin won't be activated. Lastly, make sure your magnetic torps always pass below the keel, and that your impact torps are hitting the side.
It's also worth mentioning that ships in this game have a nasty habbit of maneuvering too quickly to avoid torpedoes. Try firing at the stationary ship in the Torpedo exam to get an idea of this.
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Career: Feb. 13, 1942 "Cpt. Johny Goodwood"
Porpoise class: USS Shark, SS-174
Patrols: 2
Victories: 1 Merchants (4519 GRT), 0 Warships (0 GRT), 0 Aircraft
Sunk with all hands lost.
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