arctan(targetspeed/torpspeed) = angle you need to fire at
I use a calculator for that.
A quick reference for target speeds <= 15kts:
torpedo speed - degrees/knot
30 (slow) - 1.85
40 (medium) - 1.4
44 (fast) - 1.3
It's good to use for judging how much of an error you can have for speed in your solution and still hit, or it can be used for eyeballing it if you're lazy like me.
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