[asr]

Originally Posted by desirableroasted

When you identify a target through your periscope or UZO, you will be told what sort of ship it is.

When you know that, open up your ship identification book, turn to the merchants (Handelsschiffe or something), find your ship. On that ship's page, you will be told the "draft" of the ship... the depth of her keel.

Then go to the TDC. Click on your preferred torpedo tube, then select Pistol: I for "Impact" or "M" for Magnetic.

Your choice depends on your attack approach.

If you are 75-105 Angle on Bow, then Impact is your best option. Your torpedo depth should be 2 meters LESS than the draft (this will vary a bit from ship to ship, but you will learn over time).

If you are 0-75/105-180 AOB, and the seas are fairly calm, Magnetic is your best option. Here, you want your depth to be about a meter MORE than the draft, so the torpedo slips under the hull and detonates.

Rough seas affect both pistols. Magnetics often explode prematurely in rough seas; it helps to take your shot as close as you can safely manage. Rough seas also mean your target is rising and falling a lot, which means you may need to run your Impacts a little shallower so that they don't run under the ship.

In the game, you will be told that some torpedos have "depth keeping" problems, etc and that magnetic pistols should not be used. Ignore this; it's just for "immersion."

Good hunting!

Thanks! I will put your advice into practice ASAP.

Finally I took the bruteforce approach and shot 4 torps at the same time at that damn large merchant. 2 impacts and 10k tns prize