Hello to all. got a long shaft oceanrunner 225 on a big boat. its a wellcraft 25 foot walk around.<br /><br />my goal. --- 1 rpm = 1mph.<br />Lowest RPM, fuel effient, never WOT, 20-30 mph. I dont care about holeshot or fast. Just need to conserve gas tank for long offshore fishing trip.<br /><br />what i got now stainless 3 blade 15x19 cupped little. WOT can be above 5900. rpm is 4000 and i get about 25 mph.<br /><br />Will the rpm be lower and my speed pick up if I goto a 14.5 x 26 pitch? <br /><br />What about if I change to a 4 blade prop with hig pitch. what kind of performance do i get? i read some posting about 4 blade and it has made me confused?<br /><br />any help would be appreciated.