Sure dude! You don't need to identify ships before sinking them (although you run the risk of them being neutral), you don't need to be within 1000 meters, and you only need one torpedo per ship. It's really difficult and unlikely, though.
Try to get closer. If the convoy is already almost past you, retreat out of sight and speed to some point in the convoy's path. If you can, get inside the convoy and aim for the big ships.
If you can't get any closer, get the best target solution you can and fire away using pattern runners when possible. You might get lucky. It might also be advisable to let this one go and look for more favorable opportunities.
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