Took in my fixed-pitch McCauley prop to consider having it re-pitched for cruise. I was told that one side is right at the spec limit and the other side is just a hair above. So time to plan on buying a new prop. The prop guy commented on how you can see how "skinny" the prop is towards the ends. I asked how much wider a new prop would be and he said about an inch (I'm guessing that is half an inch per side). Given that it is fixed-pitch ,my thinking is that the "skinny" prop isn't absorbing as much energy as a new "fat" prop for any given RPM, thus not transferring maximum forward thrust for that RPM. In practice it makes intuitive sense because the POH says to run WOT at 10K' and there is no way I can run WOT without overspeeding the engine - that skinny prop just can't absorb the energy. Should I expect to pick up airspeed just by installing a new prop?