Well for me the classic stationary 4 bearing (i.e. three bearing... I use fourth bearing only in low visibility) + ship length x 1.943/ seconds from bow to stern, works pretty good...
Except for:
1. Outgoing targets (it doesn't work at all... any solutions? except the answer "don't go after the outgoing ships")
2. Changing course targets.
3. And those... I call them "dead angle" targets (targets who quickly enter into "constant distance" state i.e. too wide range of possible solutions for AOB... and you get equal degrees between bearings... bad karma).
For me usual distance is 3 to 6 MAYBE 7 km (depends on weather, type of a torpedo, time of a day/night, visibility and generally combination of all these factors).
Everything above 7 km is a shot with 50% of pure luck if you are firing single torpedo... salvo is a different story... chance of a hit grows exponentially with every additional torpedo. But that's a waste of ammo in my humble opinion...
I did scored hits at 11 km... but that was clear, perfectly calm sea at night with moonlight and the large target (HMS Hood)... task force was announced trough contact report so I did have time to position myself nicely and prepare the attack... there was a few more cases but that was pure luck...
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