I'd think that 3.5 is too shallow for anything but the smallest ships. You won't get the full flooding effect. Try 5.5m. You can maybe go a bit lower if you're engaging a Large Cargo ship (C3 in the old game) since it has those big slab sides, but the large merchant has a shallower draft and a rounder side, so wil tend to bounce off if you run the torp too deep.
One other member mentioned that if you aim more forward, under the first mast, you can bring them down with one torp. I supppose that the forward motion of the ship tends to flood the bow more if you hit forward. I happened upon a convoy last night on my 4th GWX patrol and tried that on a large merchant, at about 11,000 tonns or so. I did get the hit under the mast, but all I got for the effort was a 15 to 20 degree list. The ship kept going. The next ship in line got two in the starbord side and went down fairly quickly. A stern shot at a smallish merchant got a hit and kill. I launched my last torp of the skirmish at another large merchant from fairly long range, got a hit, but only damaged it.
I overhauled the convoy, set up again and launched from the port side of the convoy. I found my previously listing merchant and hit him again in the other side and managed to straighten his list, but the bow was pretty low and he eventually went down. His friend behind got two in the side for a slow, but confirmed kill. The last shot of that skirmish was an under the keel shot with a magnetic torp, but it was a dud.
The running battle started at 11:00 pm and it's now about 7:30am the next day. The crew is very tired, but we're going to shadow the convoy till nightfall and try it again. There are two large merchants left in this group and after this next shot of four, we will call it quits. That should leave one torp forward and a couple aft for anything we happen upon on the trip home.
This has been my most fruitful patrol yet with 3 large merchants sunk, two on the plate for our next overhaul, and three shall merchants down, two sunk by deck gun fire a week or so earlier.
I would not worry too much about getting the one torp, one kill shots of the stock game which I found a little dull. Now, I'm quite happy if I just get the hits and escape in one piece. You're a good shot, just aim lower.
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