Propping an Arima 17

[Bifmalibu]

Ive been out a couple times now and seem to be maxing out my Merc 90hp around 5K rpm, according to vessel view mobiles tach. I think I should be in the 5800-6k range. Current prop is stamped D 3x13x19R(M). Any suggestions? Thought I heard a bit of cavitation when trimmed up. I don't think the engine is mounted too high.

 

[Sea Chaser]

I had a 15P on mine and seemed a little better all around on a Honda 90. Put the OEM one back on 13P and a little more sluggish . But I think the 15P prop caused some cavitation/ corrosion issues on my Honda as it was a merc prop with hub kit so trying an experiment for a bit.

 

[Bifmalibu]

Thanks for the reply. Just doing a bit of reading, I've learned that a 1" drop in pitch is equal to 200rpm. So If I go from a 19p to a 15p I should expect to see an 800 rpm increase. A 15p prop should land me in the 5800 rpm range, which would be about perfect. The boat was loaded with a normal amount of people/gear. I guess I'll be on the lookout for a 15p that will fit a mercury hub. Thanks.