I don't know whether any study was made, but I'm quite sure from my naval wargaming days that zigzagging plays havoc with firing solutions.

With unguided torpedoes you have to consider a lot of variables, such as target speed and direction, your won, torp speed, angle of median target trajectory related to your own course, etc.

Some of these are estimates, especially the target related ones, so there are already error margins built in. If you have a target changing course, then this becomes an almost impossible task. You shoot a spread of all your tubes and pray, which means either you run out of ammo early besides risking broaching or else you let that one go and wait for a target in a hurry, who is running straight ahead.

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