Need Prop Help

[jgun]

I have a 16'6" bass/ski boat (deep V) with a 50 horse Honda 4 stroke. I had the prop just right as I was running about 5400 rpm at WOT until I added the weight of a new trolling motor and battery (over 100lbs). Now the rpms are at about 4700 and I've dropped about 4-5 mph. Would changing the prop be reccommended at this point?<br /><br />I am currently running an aluminum C3x11x15 prop. I also own a C3x11.1x13 prop. Will the 13 prop give me better rpms and hopefully mph? Thanks.

 

[Hooty]

Re: Need Prop Help

Theoretically, going from a 15p down to a 13p you sould pick up about 400rpms.<br /><br />c/6<br /><br />Hooty

 

[jgun]

Re: Need Prop Help

Am I correct in thinking I should pickup a little more speed with the 13P also?

 

[rickdb1boat]

Re: Need Prop Help

jgun <br />Drop down to the 13" to get the RPM's back up to where they should be. You probably will regain some of your lost speed, too.

 

[steelespike]

Re: Need Prop Help

I think I would be a little concerned if adding<br />as little as 100 lbs cost you 700rpm.<br /> I would wonder about a weight distribution problem or motor trim.Your fifty should hardly notice 100 lbs.You may want to run the 13" pitch<br /> for skiing and such but to counter 100 lbs.<br /> I dont think so.