FaT and LuT are ladder search pattern torpedoes. You can set their straight run leg distance before they begin their ladder search, then you can set the leg runs in between turns. shorter legs for single string convoys, and longer legs for double string convoys. The point is to fire them from afar (the ability to get in close on convoys during late war is next to impossible), and since you're so far away the convoy will probably spot them and begin maneuvering, so they will probably miss their first go. That's why they turn and come back, and keep traveling their preset leg until they hit something or run out of gas. It's like firing ping pong balls into a huge fish bowl. They're gonna hit something eventually.
The homers are what you want, though they eat up valuable renown that could be used for other things. The Zaunkonig uses a passive acoustic guidance system to zone in on engine noise, so even if a target tried to evade it would be next to impossible to do so. Usually homers are intended for use against pursuing DD's.
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