Because Americans did NOT use that method during the war. They trained to use it before the war, and found that when they tried it in actual combat they failed miserably, every single time. Read Blair's Silent Victory. I can't get at my books right now, so I can't quote you chapter and verse.

As to the game, I still haven't been able to look at the library's copy of Conway's, but if I remember correctly a British Tribal class destroyer at flank speed is turning something like 220 RPM, which is 3.67 times per second, which is impossible to count accurately. The game has them turning much slower, so as with a lot of other mechanisms the game lets you do something they couldn't do historically.

Unfortunately, Greyrider gives a link to the homepage for The Fleet-Type Submarine, but not the specific page. I can't find it anywhere.

Ok, then lets not use it:)

I have a pretty good "chief" in there too, well decorated and experienced, and I have made a habit of this when I submerge. I hear ships all the time that he misses.

Maybe determining a target's exact speed by rpms is a bit too much, but a training mission to help us differentiate the sound of an aircraft carrier from that of a tugboat would be very much apreciated... specialy when your attacking a convoy and have a hard time telling which of the sonar contacts corresponds to that big and juicy tanker. :hmm:

YES!
 

Yes, yes, yes, yes, yes and yes!

I would. I've played a lot of Dangerous Waters/Sub Command and a lot of the solution there comes from sound alone, so being able to determine type and/or speed from sound in the hydrophone would sure make me spend more time in there. This is actually a thing that I can look-over the fact that it might not have been done this way in real life. But, it's a game, no?

So yes, do it and I'll love you long time ^^

uhm... :hmm: I am afraid my sexual orientation is somewhere else:D

Okay, so you'll settle with my neverending gratitude then? *smile*

I personally wouldn't but I still think it's a good idea....

from the "Submarine Torpedo Fire Control Manual"
http://hnsa.org/doc/attack/index.htm#chap08

804. SPEED DETERMINATION:
(a) The Fire Control Party must utilize every means at their disposal to determine target speed. The following means are available:
(1) TDC: This method is described in OP1442A.

(2) PLOT: This method is described in detail in Chapter 5.

(3) TURN COUNT: The Approach Officer should have available for ready reference the most complete set of curves that he can obtain of different types and classes of enemy vessels.
Their use will furnish a means of approximating the speed of an observed target.

end reference to manual


sailor steve was right when he said that it was quickly dropped in the begining, but for what reasons? i dont know all the reasons, but i can guess at some, torpedo failures, inexperience of crews, green crews,but the one thing that
stands out above all others was the lack of japanese radar.
we have proved in sh3 that the u s navies prewar doctrine was correct.

this link goes to HNSA-Historic Naval Sound and Video

http://www.hnsa.org/sound/sonobuoy2/record4.mov
this is a link to a sonobouy training record of estimating a subs speed by rpm.

Seconded