My goal is to figure out which pitch on a prop is the best for my boat between 15, 17 an 19.
I am a complete novice to boats having bought a 1987 17 ft Bayliner Capri with a Force 85 HP (model 356X7A) motor last Fall because I wanted a boat, the price was right and the owner babied the boat. Anyhow, I want to get a new prop and everyone I talk to has a differenet opinion. The boat has no tach so I have no idea what the RPM or speed is with a WOT. The tag on the motor say it ranges from 4500 - 5500 RPM. The engine has been rebuilt and the old owner says it should have 90 HP now, if that matters at all. I had the boat on the water in September and it seemed to run fine, but keep in mind with my experience I don't really know what fine is and how a boat should respond.
Two props came with the boat and they are roughly 13" in diameter. The prop that was on the boat only has these numbers on it A623265 and PS623. The spare prop has these two numbers on it A825285 and PS625. In searching the best that I could come up with is that they are Propco props with the PS623 being 13.25 x 17 and the PS625 being 13 x 19, if I am right on these assumptions. My dilemna is that most places I spoke to about props are recommending a 15 pitch prop. Which is the safest route to take. I am fairly certain that 19 is not the answer.
On a side note, if anyone can help me find a Teleflex 53743P Tach so I can add that to my boat, that would be great as well. Being 20 pole makes it tough to get a tach on it.