The Offshore Voyaging Reference Site

Controllable Pitch Propellers (CPPs)

Earlier in this Online Book, we discussed the fuel map gap, that annoying (and expensive) disconnect between an engine’s ideal operating regime and the torque curve of a fixed propeller.

What if we had a propeller whose pitch—and, therefore, torque demand—could be adjusted to the most efficient point for whatever operating conditions happen to exist at the moment?

This is the idea behind a controllable pitch propeller (CPP).