Re: RDSL-22-CC propeller

[frankr]

There is a large difference between an 11" and a 13-1/4" pitch. Without knowing what your RPM was before, it is a guessing game anyway. But if it was performing well before, probably not wise to make such a drastic change. The factory put the 13-1/4 on because it was best suited for the average boat the motor was likely to be used on.

You are assuming wrongly on the "C". They did not make counter-rotating motors back then. Can’t say that I’ve ever seen a "CC" suffix, but even so, the letter designates any mid-year engineering changes—IF there were any changes. Otherwise it means nothing.