a particular prop by more than a coupl of inches? I had good results using a Mercury Rev-4 Prop on a FOrmula 242 tha I used to have. It performed better than the Bravo 1. Now I am curious how it would work on my Sonic 31. Problem is I currently have 26p Bravo 1's and the Rev-4 is only available up to 23p

My understanding is that you can only add enough cup to get an effective "pitch" increase of 1" to 1 1/2". I'm no expert so I could be wrong.

go to the baja forum and ask huston prop.

the pitch can be changed on a stainless prop up or dn 2" and then you can add cupping which will also drop the rpm and give a little more forward travel.changing the pitch any more than that will cause blade distoration and it will not perform like it should. hope I have helped .