Thanks for the replies - I'll try to answer the questions.
It's game version 1.5 + RFB + RSRD, on 100% realism.
'Why a 30deg gyro angle' - well, given the geometry of the situation, if I shoot at 0 or 5 deg gyro it'll make the angle of torpedo impact with the hull closer to 90deg, which I'm trying to avoid because of the famous dud problem. I was going for something more like a 'several tens of degrees off perpendicular' impact.
'Why -2/0/+2 spread'; - mostly because I've been missing a lot, and I wanted to give a big spread to increase my chances of *something* hitting :-/
But I have a theory - I'm not sure yet if it's true and I'll not have time to check it before this weekend. But here's the thing. At close ranges (inside 3K yards maybe) I'm using the stadiometer as my primary range tool. I believed my estimated track was right because I could put the scope down, wait a minute, pop the scope up and see the target right where predicted, both bearing and distance (to within a few yards). But here's the thing. The recognition manual has these red bars at the top of smokestacks, and I've been using that as the reference height. (Not sure if they're from the stock game or one of the mods). But when I've watched tutorial videos on youtube, the person always uses the *mast* or rigging height - basically the tallest point on the boat. The stack is often lower than the tallest mast.
Check my thinking here: if I'm using too low a point, that means the target is closer than I think it is. So my torpedoes will swim out in front of the target because they they're heading for an impact further out.
One reason I'm not sure about it is that I've seen a good match between the stadiometer distance and the sonar distance. Now I know the sonar can have a large error, but at close ranges it seems *pretty* good, and certainly not 20 or 30 percent inaccuracy.
Anyway, is my assumption wrong that I should be using the part of the structure marked with a red line in the recognition manual? Or should I rather be using the very top part of the mast or rigging? Sometimes the masts can be hard to see from a distance, so I had assumed they picked the easier to see smokestack instead. Maybe this could be my problem? Some ships have a big difference between the two heights. It could be a large range error, yet everything *else* would look fine, because when I check the range against TDC predictions, I'm using the same (flawed?) method.
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