Prop Pitch question

[Mercury140-I6]

Hey guys:<br /><br />I took the boat out today and after I jumped from the battery to the starter (Sylinoid went from the house to the ramp), at WOT here in Priest River (2,300') I am only getting 5,200RPM with me and 2 full size Golden Retrievers and ~1/2 tank of fuel.<br /><br />Question is. I am running a 19P now, what RPM gain would I get from a 17P? The prop I have is Aluminum. I was getting a solid 6,000 at sea level.<br /><br />

<br /><br />Thanks for your time.<br /><br />Craig

 

[Jcrain]

Re: Prop Pitch question

Nice boat. I got one just like it, but with a evinrude 90 hp.

 

[Mark42]

Re: Prop Pitch question

Rule of thumb is 200 rpm for each degree of pitch change. So that's 400 rpm for 2 degrees, but I don't know how that rule is affected by high altitude.

 

[cuzner]

Re: Prop Pitch question

You will get better hole shot, lower top end, and maybe a little better fuel economy. If its only hole shot your looking for there are other things you can do for about the price of a new prop. ( smart tabs)<br /><br /><br /> Jim

 

[Jcrain]

Re: Prop Pitch question

Do you have a planing problem with your glastron?