Magnetic Detonation Working?

[krupp_88mm]

I'm playing on 'Hard' which means every realism setting on except map updates, basically.

However, I don't beleive they are duds, as i've fired numerous times in a test-mission I made and they simply refuse to detonate if there is no impact.

set the torps sped to slow.. i think you will see they work 90% of the time then, at least i have found as long as im within 2m of the keel (which varies in height be careful where to aim, aim for the middle if possible)