ok i got all the info had the boat out today ......it is a 74 kona 17 ft with a 115 hp mercury outboard and it has a 4 blade 17 pitch ......took the garmin WOT does 39 mph at 5,100 rpm ........so what i want to do is get a little more top end speed so maybe a 3 blade 17 pitch or 3 blade 19 pitch...