how much speed would i gain

[dpfrost]

I currently have a 135hp merc on a 17' cajun. I have a 19p prop. Running at about 5600 rpm and 54 to 55 mph. How much increase in speed would i gain by going to a 23p. Or would that drop my rpm down to much. Should i go with a cuped 21. And again about how much speed would i gain by it. IF anyone could help me on this i would greatly appriciate it.

 

[LubeDude]

Re: how much speed would i gain

This might better be in the prop section, but here goes. Ever heard of "Hens teeth"?<br /><br />Well, we might be there. Looks like from the #s, you are right at the sweet spot. You didnt say whether you are running a stainless prop, and what make and how many blades. Assuming that you are running a 19P aluminum I would sugest a 17P S/S. If you are running an S/S, you might want to raise your engine a notch and see what happens. A bigger pitch prop right now isnt your answer.

 

[JB]

Re: how much speed would i gain

To Prop Forum.