thanks or your quick response. So what i gathered I need to find rpms of engine go from there?
Well propping a boat is a bit of an experiment of sorts. Every boat is a little different and responds a little different, so the best case scenario is that you find a local dealer that can loan you some props to test out. Then when you find the one that works best, you purchase that particular one.
Essentially what you'll want to look at is trying different types of props. As a general rule of thumb, usually three blade props provide the best top end and five blade props provide the best hole shot. So if skiing and tubing is your thing, then you might find that a prop like a "high five" five blader would suit you best. On the other hand, if you like top end over having a great "hole shot", then you might find you like a three blade prop best. And then there are four blades which quite often can be a compromise between a three and a five. But those are just some basic rules of thumb. The reality is that every boat is a little different so sometimes they don't necessarily all respond the same.
As far as the pitch goes, yes, you'll want to find a prop with a pitch that when you're at wide open throttle, puts you somewhere close to the maximum rpm range for your motor. Moving up in pitch will drop your RPM's down, meaning, moving from say a 21' pitch to a 23' pitch prop will reduce your RPM's. And moving down, will increase them. Additionally, adding blades will reduce your RPM's and decreasing the number of blades will increase your RPM's.
Given that, you can probably use your current props performance as a starting point and then work from there.
-Chris
