TORPEDO LEAD ANGLE
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Lead Angle = Arctan ( Target speed / Torpedo speed)
So if the target is making 12 knots, and you wish to fire a 30 knot T-III electric, then your lead angle is...
Lead Angle = Arctan ( 12 / 30 ) = 21.8 degrees
As long as you're within 5000 metres of the target track.
Another way to figure how much to lead 'em is via the Law of Sines, i.e.,
arcsin ( sin AOB ( Target speed / Torp speed ))
if AOB = 90; Target speed = 25; and Torp speed = 40, then Offset Angle of Collision (OAC) = 39 degrees
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