I get duds about 2 to 3 per 14 or about 17% of the time. I count the ones that go under the ship as a dud. However in GWX in 15mps winds with waves over your conning tower. If you fire at 3.5m depth probably close to half will breech the surface and detonate early. At 4.5m a fair amount still will breech. Magnetics become unreliable as well from the ships pitching. Technically these wouldn't be true duds, but amount to the same thing. Setting the depth to 5 to 6m can eliminate the breeching torps but then you have a good chance of the torp deflecting off the rounded part of the hull. Thus its possible to get close to 30% torpedo failure in 15mps winds. I used to have 2 week periods of these high winds in game.
I wonder if turing duds off eliminates breeching torpedos as well as actual duds? The NYGM mod trys to get the dud ratio more realistic by having all torpedoes use the magnetic arming system and limits the depth the torpedo can be set to 3m or deeper. I think the 3m limit is a good idea since many DD's have a 2m draft so the torp has to be magnetic and in moderate to heavy seas makes it less likely to detonate. I always cringe whenever I read posts where someone takes out the 4 escorts then sinks the entire convoy at their leasure with theie deck gun. NYGM fixes that pretty well.
