Error tolerance, man! When you're out there bobbing around in the big green ocean, there are errors in every measurement you make, especially in target speed. Warships love to speed up and slow down, zig back and forth and generally screw up our magnificent vector triangles. And they are moving fast. A small error can make us miss, not just hit an unplanned part of our target.
So everything we do in putting together an attack plan should have one goal in mind: mitigating the effects of inevitable error. The absolute BEST factor in that is torpedo speed. The faster the torpedo speed, the more error tolerant your solution.
Three rules for maximum error tolerance:
GET CLOSE a shot from 700 yards gives the enemy almost no time to avoid and is twice as error tolerant as a shot from 1400 yards.
WATCH YOUR TORPEDO TRACK ANGLE that's the angle at which the torpedo strikes the target. The closer to 90º the torpedo is, the more error tolerant your solution. As mentioned above in another post, there are reasons to toss this one out the window with warships.
USE THE SMALLEST POSSIBLE GYRO ANGLE preferrably zero, with the vector analysis attack. This eliminates range from the solution and is possibly the most important factor in mitigating error if you have no radar.
USE FAST TORPEDOES discussed above. The faster you can get the boom to the target the less time there is for something to go wrong. And the difference in impact point along the target length for a given error is larger or smaller in proportion to the torpedo speed, with the faster torpedo having the least variable impact point.
One, two three.........more than three.
See? There is error in my targeting solution. And a final thought: you're going to have some misses. I have lots of them. If all you shoot is the sure things, your score isn't going to be very good. Take your misses with a smile and learn from them. No guts, no glory.