AFAIK the british were the only ones to make a big feature of this, and this they could do because most of the world's merchant marine engines were built in britain

If you google "WW2 ship propulsion" you get a lot of info on the engines, boilers in use at the time. There were only a few main types of which most were Allied in origin.... The info is available on worldwide shipping. :know:

I'm gonna try using the calculator first. Without pausing that is.

I better start digging that sicentific calculator of mine. More exact than the sinus ruler.

Meanwhile I try to send OLC a hypnotic tape telling him to re-do his mod for SH4 in 1440x900 resolution. Subliminal slavery LOL

I don't think it's simple matter of resizing the image as a widescreen has a different aspect ratio alltogether.

As for using hydrophone to plot the target solution well actually as far as I remember the US sub force did that sometimes during WWII as written in Red Scorpion like during bad weather condition.

Minor adjustments at the original link.. :)

I've realised that there's no ship length data available in the ship recognition manual. Oh shame now I remember why I hated SH4 :dead:.

If I may add a comment on speed measurements using the periscope centerline. A near-90 AOB view is not a neccessity for it, it's just that it's impossible (structures on the ship hide the exact stern or bow from view) or almost useless (as someone allready explained on the first page, movement is hardly noticable appart from the bow-wave) with a near head/tail AOB view. Best accuracy is attained when the target shows 90 AOB, but anything between 30 and 150 degrees should work well I think. The most important consideration is is that you DO NOT move sideways with respect to the periscope-centerline. Or you will add some of your speed to his speed and mess up the measurement. That means being at an absolute dead-stop when looking at anything other than 0/180 relative bearing, OR you can keep moving (even fast) but the scope needs to be exact at 0 or 180 degrees relative bearing (so the periscope is in lead of the target before it passes your periscope/bow/aft-centerline). So the trick is to turn putting your bow or stern just enough ahead of the target. And make sure you have stopped turning before you start the stopwatch.

As for calculation tools the following thread may be a solution for not having OLC's mod for Sh4. Just make yourself a DIY-slideruler based on historically accurate tools. Unfortunatly the rapidshare link is dead. But there are other threads about this topic that should have newer links. Just do a search for 'sliderule' in the Sh3/4 forums. PM me if you need me to send it. Caveat: the (back)part of the american slideruler that you would need to calculate speed was not part of it. It is based on a german slideruler. But I'm sure the tracking party had some slideruler things in case of TDC failure.

As a start:

http://www.subsim.com/radioroom/show...&postcount=131

Is there a video tutorial that explains the steps to manual targeting? I'd like to break away from the auto.

Several. Check the stickies at the SH4 forum here. I recommend watching especially WernerSobe's videos to learn the basics of the TDC(and sonar-only attack, but that's a bit more advanced even if not very hard), and I believe Rockin Robbins made a video on the "Dick O'Kane"-method. The more different "methods" you master, the better :up:

Thanks! I find the German doctrine so much easier to learn than the American. I'll use that as a step towards learning the American system.

Has anyone ever validated that the prop noise wav file in SH4 (or SH3) is actually usable for determining speed via turn count? ...or was that part of a mod I don't have (like TM).