Well, the ranges for all the submarines are about 28-35 for 688i, 28-35 for the Akula, and 35-47 for the SW.
Anyone could reasonably justify setting the speeds for the subs anywhere in here.
Now, it just so happens that one can reasonably project for the 688 from the previous US classes, and also one can suspect that the 688i is no faster than the 688, based on the specific improvements known to be done to that class. My estimates, and about 75% of the opinions I have read, place the 688i speed at 31-32 kts.
For the Akula, the generally reported speed for the original Akula is 33kts. In regards to the Akula ImpI/II, there is a lot of dispute over just what the difference between ImpI and II is exactly, but the best sources place the speed of the Akula II at about 35kts. However, since the sources also show that the ImpI and II have more in common than the I and ImpI, it stands to reason that the reactor and major drive elements are shared more or less the same between Imp I and II, with the differences mainly being in the transmission and active sound reduction systems.
For the SeaWolf, that really is anyone's guess...
There is no single source that one can point to most of the time and say that this value should be used over another, but rather a process or sorting through the data and deciding on what would work best in game.
And since I'm the one currently doing the work, I get to make those calls. It's a bitch, but someone has to do it.
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LW
 
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