Sometimes I'll try for a DtT (down the throat) shot against a lone DD. If >3km away, I'll surface at flank and blaze directly away from the destroyer. Wait till he's at max speed, and going straight for you. Line up a rear T2 shot with 0 gyro and set it for 1m below keeldepth. Fire. Continue at flank - he'll probably miss with his shots. Dive with ~30 secs to impact. He'll continue at flank, and hopefull keep exactly that course. Sometimes you can get a kill with this. It works _much_ better with a wakehomer. You can just keep him running after you and let the wakehomer chase him down. But yea - in general - don't waste torps DDs.

1939- 40 I even use deck gun to get his attention. When he turns at
me i dive to PD and line up at 0 degrees and use tactic in last post.
No Guts no Glory. Good practice for SH4.

letterboy1
you might want to take a look at this chart, of torpedo offsets, as i think this chart will answer the question you asked.

http://img171.imageshack.us/img171/2...oanglespv6.jpg


this was not made by me, but by someone along time ago, it was written for sh1, so its gonna be good to use for sh4.
the offsets are given in yards, the english measuring system, not meters. if you want to use it for sh3, you have to convert from yards to meters.
the chart lists the torpedo offset angle on the left column, and the ranges at on the top.
to use this chart, ill make an example:
if you have a target vessel at 500 yards, and you want to fire a two torpedo spread at the target, and you set your two torpedoes for a half degree spread,
then when the torpedoes strike the target, they should explode 13 yards apart against the ships hull.
if you have a target at 2000 yards, and you want to fire a spread of 1 degree, then the torps will strike the targets hull at 105 yards apart from each other.
i hope this helps you, and answers your question, which was a very good one.

the data is hard to read with the blue background if your going to print this chart out, so i removed the blue, for white, which is easier to read now.

http://img87.imageshack.us/my.php?im...oanglesvh5.jpg