Thanks for the info Saturn5. FYI, I ended up destroying the whole convoy and had 5 AP and 9 HE munitions left. My total haul was twenty ships and I think it was around 180 tons.
I have never made it to 1941 in the game, so I realize that I am going to need to modify my aproach to plucking these little merchants off. None the less, this last patrol was my most successful even though I never made it to my assigned patrol destination as I had nothing left to fire with and I wanted to reload and get back out for another possible turkey shoot.
If in fact all the merchants get deck guns, then from here on out I can see why the XXI boat would be useful as you have more torps and can remain submerged for all of your attacks.
I still don't see why you would not want to take out the armed escorts on a convoy to make it a little easier to wipe out the whole bunch without being harrassed.
Another question for all: Which engine upgrade should you go with, the turbo charger (exhaust driven) or supercharger? Any sugestions and comments are most welcome. :hmm: