Iowa battleship and magnetic torpedoes

[muser]

I run GWX3 and have never run across an Iowa class battleship in the game, so decided to set up a single "test" mission with a IXD2 and a few Iowa class ships sitting dead in the water out in the mid-Atlantic. Basically a "turkey shoot."

Impact torpedoes worked as expected, though it took me four or more to do the job -- no problem with that. Magnetic torpedoes, on the other hand, failed miserably. Although I fired dozens, not one detonated. The draught of the Iowa is stated to be 13.6m and so I set my torpedo depth to 14.5m. The torps passed just under the hull with no problem, and right on out the other side without detonating. Eventually, I tried varying the torpedo depths from 14.0m - 15.5m but the results were the same.

Except for the occasional dud torpedo, I've never before encountered a vessel, in the game, that would consistently allow a properly set up magnetic torp to pass unaffected below the keel. Does the Iowa class come from the famous GWX factory equipped with some sort of massive degaussing system? (Just kidding). Or, is my system somehow kaput? Has anyone else encountered this problem with the Iowa class vessels?

(Just so you know, I added several other vessels to my "turkey shoot" scenario, and they all responded appropriately to my magnetic torpedoes. So my prolem appears to be with just the Iowa class vessels.)