Did I order the correct prop for my new Yamaha?

[Spoiledrotten]

I just bought a 2015 Bennington 20SLX with the Yamaha F90. My WOT RPM is about 5100 and 26-27 MPH. The prop that came on that motor is a 3 blade, 15P. The new prop from you guys is supposed to be delivered today. I ordered a 4 blade 13P (Prop #9413-133-13Hub #RBX-108) to see if it would take my RPM up just a little without damaging my top speed. The specs for this motor calls for the RPM in the 5000 - 6000 range. Thanks in advance.

 

[steelespike]

A lot to have to guess about.
Is your 5100 a light load,normal load? Assuming it turns the 13 to 5500 and 20% slip, speed could be about 27.Speed may hold up better as you add weight.

 

[Spoiledrotten]

5100 RPM and 26 MPH with the wife and I (total of 320# body weight) 1/2 tank of fuel (about 12 gals), ice chest and other necessities. And that is trimmed to the max getting that speed.

 

[Sea Rider]

Trim slightly +, full throttle, when on plane trim down to 0 to maintain combo riding parallel to water level, weight must be evenly distributed throughout deck. That way should achieve better prop thrust than trimming to the max. Check that you don't have water splashes out or over transom. If prop aerates at close turns need a engine height optimization.

Happy Boating