Well if i have spottet a Convoy i try to get into a 90° angle to have a good positin. If it are small ships i fire 2 Torpedos to make sure at least one hits. On large ships like the HMS Rodney i found once i fired four torpedos. Also i sometimes search the biggest ships in the convoy, set the speed and direction for two maybe three ships open the Topedohatches and wait until i have a good distance and a good position.
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