Sielnt Ohio Class in RA

[blackcan]

Hey, i was playing some Casual Quick Missions and in one i needed to hunt a Ohio Class and i Searched for a like 30 Minutes without any Contact (except the bremen (I'm driving the 212(GER))

When i looked into truth i saw that the ohio class is driving past me, 3 NM away with 15 Knots and i don't hear anything except one extremly slightly 60HZ line.
Is the Ohio Class really that silent? (there wasn't a Layer)

[ikalugin]

Where was it, relative to your position? Which sonar did you use?

[blackcan]

This happend in GUIK and i was using the 212A which uses ingame the "TAS 3"
He drove toward me and then past me
He wasn't in any shadow or something.

[Mike Abberton]

Admittedly my numbers are from the LWAMI mod, not RA, but there, the Ohios (PSL 57) are very quiet. Better than a 688 (PSL 58-62), and almost as quiet as a Seawolf (PSL 55).

Compared to SSKs, the Ohio in LWAMI is quieter than alot of the 80's-early 90's vintage SSKs like the original Kilo (PSL 60), but noisier than most of the newer SSKs (212 PSL is 53 which is tied for lowest in LWAMI).

That being said, a lot of detection ranges depend on a bunch of variables. Not sure on the exact details, but as long as the sub doesn't have to run the reactor cooling pumps, speed does not affect sound level all that much (assuming no cavitation of course). Fifteen knots in an Ohio is probably reasonable for not having the pumps running.

Mike

[blackcan]

Originally Posted by Mike Abberton

Admittedly my numbers are from the LWAMI mod, not RA, but there, the Ohios (PSL 57) are very quiet. Better than a 688 (PSL 58-62), and almost as quiet as a Seawolf (PSL 55).

Compared to SSKs, the Ohio in LWAMI is quieter than alot of the 80's-early 90's vintage SSKs like the original Kilo (PSL 60), but noisier than most of the newer SSKs (212 PSL is 53 which is tied for lowest in LWAMI).

That being said, a lot of detection ranges depend on a bunch of variables. Not sure on the exact details, but as long as the sub doesn't have to run the reactor cooling pumps, speed does not affect sound level all that much (assuming no cavitation of course). Fifteen knots in an Ohio is probably reasonable for not having the pumps running.

Mike

Thats interessting and good to know.
So basciailly the Ohio can in the right conditions drive with 15 knots without being easily detected?
Thank you for that information

[Mike Abberton]

I wasn't trying to say that 15 knots is 100% safe, but it's certainly not out of the realm of possibility. The US has spent a lot of time not just on overall submarine quieting, but also increasing the tactical speed (highest speed where a sub is still very quiet) of our subs.

The best way to know for sure would be to test it in multiplayer or in a custom scenario to test detection distance versus target speed.

The link below is to a pretty good intro into sound profile/noise levels for submarines.

http://www.armscontrol.ru/subs/snf/snf03221.htm

Mike

[blackcan]

Originally Posted by Mike Abberton

I wasn't trying to say that 15 knots is 100% safe, but it's certainly not out of the realm of possibility. The US has spent a lot of time not just on overall submarine quieting, but also increasing the tactical speed (highest speed where a sub is still very quiet) of our subs.

The best way to know for sure would be to test it in multiplayer or in a custom scenario to test detection distance versus target speed.

The link below is to a pretty good intro into sound profile/noise levels for submarines.

http://www.armscontrol.ru/subs/snf/snf03221.htm

Mike

Thanks for the link it's a bit hard to understand but I'll just read it often and research things.
So due the special architecture of the 212A (having those cells (don't know the English name sorry )) it should be easily possible to drive with 7-9+ knots pretty quite (depending on weather/ water / etc ))
?