[mazda77]

Maybe they need to consider carbon fiber for the prop shafts. Racers I know have gone to carbon fiber driveshafts in an effort to save weight so there might be an alternative win for this possible solution. Size is not an issue as Boeing is maing the 787 totally of composites. Then they would eliminate the dissimilar metals concerns.

[Roccus]

According to this it has carbon fiber shaftlines. However, propulsion comes from jet drives, not standard propellers (except for the bow thrusters)

http://en.wikipedia.org/wiki/USS_Independence_(LCS-2)

(For some reason the last “)” is not picked up by the hyperlink, so you'll have to click a second time once you reach wiki.)