Hi all
To be honest, I won't expect the Titanic's top speed to change. Only critical errors will be fixed as the developers are already working on the new SS2009.
It's not as easy as it might look. Increasing the top speed will fundamently change the dynamics model of the vessel and to get it right again could easily take a week of work.
The model will probably need an update for the SS2009 so my humble opinion is that updating the Titanic for SS2008 to gain only 1-2 knots will be a complete waste of time.
RPM and speed aren't directly linked in the game. Max RPM is set manually and is then linearly scaled to match the engine thrust. However, quite a few vessels have fixed RPM or a special program/curve (that isn't linear) so do not consider the game RPM for being realistic. It is simply an expression of the percentage of power ordered.
Regards
groennegaard