Ok, Amizaur wanted me to let everyone know that in the discussion of NL and Sound vs. Speed, we are limited in our ability to make anything other than linear increases due to the parameters of the way thrusts are coded in the DB.
The only option that we have to make a curve that is anything other than linear from 0-max speed is to make a small flat area at the beginning that goes up linearly from a certain value, however, this comes at the cost of having to increase the minimum speed (forward or backwards, absolute value) to something other than 0. This was used to make the SW, 688i, and Akula II thrusts, meaning that your minimum speeds are slightly increased. For SSN's, this is not a big issue since in RL they would almost never be bottomed or move at a speed slower than their planes would be able to keep them trimmed, which is about 3kts.
However, this is not an option for modelling the SSKs due to gameplay considerations, so at this time we don't have a way of making their sound increase from something other than 0 in a linear fashion.
So, unfortunately, the long and the short of this is that all sound vs speed curves have to linear, between min-max speed.
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