I played around in the sub school this evening firing off about 2 dozen shots. I looked at the Mogami's draft of 4.4 meters, converted that to roughly 14 1/2 feet and started with 12 feet of depth on the torps. I set the torp speed on Slow to have more time to set up the camera views.
4 fired at 12 feet - 4 hits, all just above the hullblisters and one noticably higher by about 3 feet. All seemed to do about the same damage although one was a one-hit instant sinker.
4 fired at 13 feet - 4 hits all just above the hullblister, all seemed to be within 2 feet of each other. Pretty consistent.
4 fired at 14 feet - 4 hits, one below the blister, 2 above and one hit the blister I think.
4 fired at 15 feet - 4 hits, 1 above the blister, 1 on the blister, 1 below the blister and one looked dead under the keel. Oddly enough, all took out chunks except the one that went off under the keel....no damage under there that I could find.
4 fired at 16 feet - 3 hits, one in the blister so it was 2 feet high or more, one under the blister and above the keel, and one dead under the keel....THAT was impressive. Didn't sink right away but there was a large hole through the keel between the port and starboard blisters.
4 fired at 17 feet - 2 hits, one under the keel and one on the blister, 2 under the keel passed right on by and both seemed to be at least 4 feet under the keel.
So to me it seems clear that:
a) The depth setting for the torps is in feet
b) the draft is pretty accurate on the Mogamis at least
c) setting it just above the draft depth seems to give you pretty good hits with large holes and sometimes one shot kills even on larger ships
d) I'll keep on setting the torps at the draft or maybe a foot under there.
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