Like Puster Bill, I find value in using them against larger fast targets. A hit will either disable the ship or reduce its speed. This is very helpful in a convoy or taskforce situation. The escorts will eventual abandon the stricken vessel and with a little patience you will have a nice fat target to destroy at your leisure. The only problem with this tactic is that it negates one of the benefits of using accoustics, I find you have to aim them a bit more than you usually have to. If you don't take at least a half-way decent aim at your intended target, chances are the torp will take off after an escort or some other fast moving vessel.
They are darn fun to watch. One of the funnest attacks I can recall was in an XXI at around 30m depth with the 6 forward tubes loaded with 4 LUTs and 2 Accoustics. I launched them all blind in a spread as the first ship in the convoy passed my nose. Not really a historically correct attack nor the most effiecent...but I wanted to see what would happen...it was also early '45 and I needed every advantage to avoid the escorts. Surprisingly I had 5 hits on 3 different ships!
For full disclosure...I have edited my installation so that all torps are free....I do not believe in spending renown on ammo
