Well, I installed my new prop today, hoping for higher rpm’s.  I mistakenly assumed that by installing a smaller diameter prop with less pitch, I would gain engine rpm’s.  Wrong.  I am still stuck at 4800 rpm’s, big prop or little prop.   

How different are the props supposed to be?

Rusty (where's my pizza) 

The original prop was a 64 x 78.  I replaced it with a 62 x 72, same manufacturer. Should take less power to swing it, which one would expect more rpm’s?  Paul Conner