It´s possible change or overide the safety measures for torpedos in Sh3 ??

Perhaps is for the circular pattern torpedoes or acoustics, but both are not modelled in silent hunter.

o´kane in the pacific was sunk by a faulty torpedo that made a turn against the sub

modern times, the tordpedoes used in NSubs. But it indicates it was possible so why didnt they do that back in the war?

Don't know. Maybe they didn't trust them. Way back in the 1890s the British didn't trust the newfangled armor piercing shells, so battleships still carried a complement of AP solid shot.

With a mechanical device such as a little propellor which winds down to a plunger and arms the thing, maybe that was as fine as they could get.

Sunk a ship in a bad storm where I had no visability 'cept real close (+/- 300m) I was able to sink him by following him submerged for a while and getting a real good plot of his position, speed and course. Then a sped ahead of him got into a good attack postion based on the above and made sure I would be about 600m from him. I waited submerged at 0 knots (sorry about that for you hardcore types out there) and used my hydrophone operator to tell me the bearing to target. Sighted this bearing in the periscope and BOOM! I fired 2 toprs and 1 hit. I thought the hydrophone operator's reported bearing would be a bit too astern as he is hearing noises from the prop, but based on where the torps went it looks like the bearing he game me was mid ships. It was a challenge doing it this way. The hard part was actually finding the ship in the first place!

In "Operation Drumbeat" by Micheal Gannon he says that the fear of every torpedo mixer was that;

"Theoretically it was possible that when water rushed into the torpedo tubes before launching that the flow against the pistol propeller could activate the device that controlled the torpedo's safety run and cause the eel to arm itself while still in the tube. In which case maybe - boom!. No more drinks at the Cafe les Trois Soeurs"

So even if it was possible to set a shorter arming time, your crew would probably tell you where to go.

A really rough sea make it almost impossible to sight in a target, you see it and get ready to fire then water flows over the periscope and it's gone, can't get a shot off. It's almost impossible to sink anything cause you keep loosing the target and as there are several targets that are the same, ie: T3 Tankers, you don't know which one you fired the torpedo at and got an impact and the ships are scattering, so you don't know which T3 it was that you hit so that you can hit it again. AAAAGH!!!

This was a single ship. It would've been a lot harder if it was a convoy for the exact reason you mentioned.

In game the arming distance is 250m, ive had them go off just short of 300m many times. 300m is idealy the closest you want to shoot from though to help avoid any distance mesurment errors.

Also in a heavy storm both your target's keel depth and your torpedo's depth keeping can be thrown off by several meters due to wave action (causing the torpedos to run too deep and/or the keel to raise up). Also dont forget the underside of a ship curves from vertical on the ship side to horizontal at the keel, hit that area and the torpedo will bounce almost every time.

It was a convoy of about 18 merchants and 5 warships. There were several T3 tankers.

Sorry if this has already been answered, but in reality could subs of that era fire torps in stormy seas? Seems the sub would be rocking too much at periscope depth.
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http://users4.ev1.net/%7Etaragem/moon_sub3.jpg

Yes, the waters were absolutely too rough. My sub conning tower kept showing above the surface while I was at periscope depth, therefore the 6 warships kept bothering me, but I managed to send a salvo shot at a troop transport and sink it and then I had to leave the area at 70 metres.

The closeist I ever hit and sunk a target was 287m.

Andy, I thought the arming distance was 300m.

Does anyone knows what is the max. firing depth ? in game it seems that the PD is the limit. Does anyone knows why we cant fire them say, from 30 m?

In reality...I think it was possible to fire torpedoes down to 20-25 metres.