[Hylander_1314]

Jeff, on the fish, with MkIV types, don't use the magnetic detonators. The darn things have a nasty habit of prematurely detonating. American torpedoes were so bad until the bugs got worked out of them by 1944, that it was a big problem. Sea conditions also play havoc on them.

Also, the depth keeping quality sucked bigtime. Set your torpedo depth as shallow as the guage allows, as they have a nasty habit of running 10ft too deep.

Try to set up your torpedo shots so that you make them with contact detonators, at high speed, and close range, shallowest setting, and at as close to 45 degree angles when they impact the ship.

The only trouble with contact detonators is that at close to 90 degree impact, the detonator mechanism would bend or break. And try to make your attcks in calmer seas. I rarely fire a fish when winds are over 8ms. And it sometimes means passing up juicy targets from convoys, single ships, and task forces.

But if you take the time to set up properly for an attack, you can have 60 to 90% success rates.

I have never had a mysterious sinking. Were you using time compression? Sometimes weird things can happen using it.