The Seawolf is the quietest SSN with the least steep sound-speed relationship in stock DW as well as the LWAMI mod. There are too many possible variables to determine--or even estimate--a speed at which you risk counterdetection, though.
Tactical speed is 15 knots--the washout speed of the TB-29.
At this speed, in stock DW, it is quieter than a Flight I 688 at rest, and is about equal to an Akula II at 10 knots.
If you use LWAMI, then it is about equal to a 688 at rest and an Akula II at 8 knots.
__________________
|