wot rpms v4 110 hp

[Johnson110]

I have a 19ft cc boat, motor is 110 mounted with cavitation plate level with bottom of boat, with a 15 sst prop getting about 5600 rpm with just myself on boat, with a 17 sst prop getting about 5200 rpm with myself on boat, i weight about 210 lbs, question is it safe to use the 17 sst prop? boat does 33 mph w/ 15 sst and 35 mph w/ 17 sst!

 

[Dhadley]

Re: wot rpms v4 110 hp

Sounds like the motor is mounted a bit low for an SST prop. They wont run as high as a Stiletto but they can certianly run higher than "even". <br /><br />Try raising the motor a couple of holes and retest with the same 2 props. The same 2. Not the "same as" but the exact same 2. You have some great baseline numbers. Make note of the water pressure to compare to the new X dimension.<br /><br />With the 17 youre at about 18% slip. With the 15 youre at about 19%. We can certianly improve on that!

 

[Johnson110]

Re: wot rpms v4 110 hp

Dhadley, Thanks for your reply, right now i can not take boat out of water to raise engine, which prop is better to leave on engine for the season the 15 or the 17 sst, again i do respect your answer!

 

[Dhadley]

Re: wot rpms v4 110 hp

For longevity of the motor the 15 will work best. Especially if youre going to pull skiiers or tubes etc. Or have an increased load.<br /><br />Once you get it out we'll work with height to get the 17 working better for more speed. Our target rpm is 5800 with an average load.