Merc 115 prop?

[fishdog4449]

What diameter prop should I have on a 115 inline6 Glassmaster 17'?
Looking for speed more than hole shot, so i'm thinking 17P or maybe even 19P?

 

[Chris1956]

Re: Merc 115 prop?

Dog, Just so you know, the prop diameters are fixed by the manufacturer. You get to choose the pitch of the prop you want, and you get a given diameter.

It is hard to guess what pitch is optimum. 17P is a good starting place. If the WOT RPM is more than the suggested max RPM, go up in pitch. 2 inches of pitch will drop the RPM about 400. If the boat is a heavy deep vee, you may need to go to 15P.

 

[MercFan]

Re: Merc 115 prop?

If you can get 2 or 3 props to test before you buy I'd get the 15 and 17. If you have to buy on faith alone, get the 15. I used to run a 17 om my bowrider. It's an old boat so pretty heavy. And I couldn't get to 6000 rpm WOT. Bought a 15 last month, and I now break 6000, with no reduction in top speed.

 

[Scaaty]

Re: Merc 115 prop?

Means zip until ya tell us what prop now, and the R's at WOT