A passive sonar only attack method?

Rockin Robbins · 05-07-09, 10:58 AM

Hmmm....makes good sense. The prop count mod won't work at all because the prop is not continuously variable through the range of target speeds. There are only a few recordings of prop sounds and the game slides whatever one it wants to in there loosely based on target speed. So for a pretty wide range of speeds the prop count will be the same. The most you might determine is fast, medium or slow. That's not good enough. Hope they get that worked out in SH5.

But we didn't have any charts to relate rev count to target speed in WWII. The reason for that is that there was no database of Japanese shipping that was anywhere near comprehensive. It was a far cry from now, where the submarine has a database of just about anything bigger than a rowboat anywhere in the world and the sonar id's the target by name and gives pretty precise speed based on that id plus accurate rev/speed data for that individual target. We had data of questionable accuracy on a few warships and next to nothing on the merchies. So the knowledge just wasn't there to determine target speed by counting prop revolutions.

That's movie stuff. Let's not make the Das Boot error in the Pacific. As much as is possible, let's recreate reality, not movies.

Sonar WOULD have a valid function during the creation of the bearing rate table and chart, though. One of the assumptions, that the target maintains the same speed during the observation, can be verified by the sonar operator, and it is his job to announce any changes in target revs during the process. If he announces "target speeding up" you have to start the whole bearing rate analysis over again.

I guess you can guess

that real submarines did this. And you know the game devs chose not to integrate bearing rate tables and charts into the game (add to the list of SH5 bells and whistles!). For details go to the Submarine Torpedo Fire Control Manual, page 5-43. It has the precise formula you need and it won't help!

Your way is MUCH quicker. Even better would be a reproduction of the authentic methods they used in the war. You don't read much about it because it wasn't done very much.

05-07-09, 10:58 AM	#4
Rockin Robbins Navy Seal Join Date: Mar 2007 Location: DeLand, FL Posts: 8,900 Downloads: 135 Uploads: 52	Hmmm....makes good sense. The prop count mod won't work at all because the prop is not continuously variable through the range of target speeds. There are only a few recordings of prop sounds and the game slides whatever one it wants to in there loosely based on target speed. So for a pretty wide range of speeds the prop count will be the same. The most you might determine is fast, medium or slow. That's not good enough. Hope they get that worked out in SH5. But we didn't have any charts to relate rev count to target speed in WWII. The reason for that is that there was no database of Japanese shipping that was anywhere near comprehensive. It was a far cry from now, where the submarine has a database of just about anything bigger than a rowboat anywhere in the world and the sonar id's the target by name and gives pretty precise speed based on that id plus accurate rev/speed data for that individual target. We had data of questionable accuracy on a few warships and next to nothing on the merchies. So the knowledge just wasn't there to determine target speed by counting prop revolutions. That's movie stuff. Let's not make the Das Boot error in the Pacific. As much as is possible, let's recreate reality, not movies. Sonar WOULD have a valid function during the creation of the bearing rate table and chart, though. One of the assumptions, that the target maintains the same speed during the observation, can be verified by the sonar operator, and it is his job to announce any changes in target revs during the process. If he announces "target speeding up" you have to start the whole bearing rate analysis over again. I guess you can guess that real submarines did this. And you know the game devs chose not to integrate bearing rate tables and charts into the game (add to the list of SH5 bells and whistles!). For details go to the Submarine Torpedo Fire Control Manual, page 5-43. It has the precise formula you need and it won't help! Your way is MUCH quicker. Even better would be a reproduction of the authentic methods they used in the war. You don't read much about it because it wasn't done very much. __________________ Sub Skipper's Bag of Tricks, Slightly Subnuclear Mk 14 & Cutie, Slightly Subnuclear Deck Gun, EZPlot 2.0, TMOPlot, TMOKeys, SH4CMS Last edited by Rockin Robbins; 05-07-09 at 11:20 AM.