Questions about Hydrophones and Convoy Attacks

[cleverusername]

I think most convoys stop swerving about 1-2 hours after your attack. Unless they have damaged ships among them, in which case they'll swerve indefinitely. At least that's been my observation.

If you have them, use Mk 18's against convoy escorts. The warships keep a sharper watch, and will detect your incoming torpedoes trails father away than merchants, allowing them to turn on their rocket-assisted propellers and avoid your shots. The Mk 27 is also a good idea, but it's really slow (10 kts), and tends to disable ships instead of sinking them outright.