Are you bothering to watch the videos I am posting?
Here is another one.
Target speed is 27 knots
Torpedo speed is 31 knots because the firing range exceeds 4500 yards (we dont care how much it exceeds 4500 yards just that it is past the 46 knot torpedo range)
The Arctangent of 27/31 is 41 degrees.
I dont touch the TDC, fire on the 41 degree firing bearing and put 4 torpedoes in a 27 knot target at 8000 yards.
I think I have the better grasp of the math here and can prove it over and over.