try again

[starcraft1982]

so i got NO help in last post so here goes again.1988 cajun bassboat.18 1/2ft w/1988 mercury 150hp xr4 black max.small jackplate,stingray hydrofoil,laser11(two)SS 21p prop.diameter unknown(number on prop is 48-16546A45 21p).2 adults@220lbs. ea.,3 batteries,@15gal. gas,and normal bass gear.dry wt. of bboat is @1200lbs.at WOT,turning 6100rpms,gps speed 53mph.is a up in pitch recommended here to get rpms down.i believe i read window is around 5500rpms.dont quote me on that.6100 just seems a bit high to me,but again,you guys know more than i do.so please help.i dont care much about improving holeshot.i assume going up in pitch would help w/top end some.i guess i want to know if that speed is reasonable for the rpms im turning and what can i do to bring rpms down a little and at least keep or gain a little speed.thanks in advance.

 

[usskydvr]

Re: try again

That XR4 max recommended RPM is 5000-5600. A 23 pitch should drop your RPM 300-400. You may check you jackplate first to see if you are too high and causing some ventilition. Speed seems about right.

 

[Bondo]

Re: try again

so i got NO help in last post so here goes again.1988 cajun bassboat.18 1/2ft w/1988 mercury 150hp xr4 black max.small jackplate,stingray hydrofoil,laser11(two)SS 21p prop.diameter unknown(number on prop is 48-16546A45 21p).2 adults@220lbs. ea.,3 batteries,@15gal. gas,and normal bass gear.dry wt. of bboat is @1200lbs.at WOT,turning 6100rpms,gps speed 53mph.is a up in pitch recommended here to get rpms down.i believe i read window is around 5500rpms.dont quote me on that.6100 just seems a bit high to me,but again,you guys know more than i do.so please help.i dont care much about improving holeshot.i assume going up in pitch would help w/top end some.i guess i want to know if that speed is reasonable for the rpms im turning and what can i do to bring rpms down a little and at least keep or gain a little speed.thanks in advance.

Ayuh,.... Probably because this post will make yer eyes Bleed tryin' to read it....
There's suppoosed to be spaces between letters, 'n periods, etc...

So I got NO help in last post so here goes again.

1988 cajun bassboat. 18 1/2ft w/1988 mercury 150hp xr4 black max. small jackplate, stingray hydrofoil, laser II SS 21p prop. diameter unknown(number on prop is 48-16546A45 21p).
2 adults@220lbs. ea., 3 batteries, @15gal. gas, and normal bass gear. dry wt. of bboat is @1200lbs.

At WOT, turning 6100rpms, gps speed 53mph. Is a up in pitch recommended here to get rpms down.
I believe I read window is around 5500rpms. dont quote me on that. 6100 just seems a bit high to me, but again, you guys know more than I do.

So please help.
I dont care much about improving holeshot. I assume going up in pitch would help w/top end some.
I guess I want to know if that speed is reasonable for the rpms I'm turning and what can I do to bring rpms down a little and at least keep or gain a little speed.

Thanks in advance.

Now, ain't that a 'ell of alot Easier to read....

Sorry,... That's the co$t of free advice......

 

[Bob_VT]

Re: try again

You had better go back and read your other post. Do you think people were just waiting to help on the 4th of July!! One of the best prop people in the business answered and ask you a question about diameter.

My best advice to you is have patience. ........

You are right.... so I will LOCK your "old" post from 2 days ago up.

 

[starcraft1982]

Re: try again

Thank you to the two "actual"replies so far.Did you have trouble reading my post?i just dont want to overrev my engine,and hope a higher pitch may help.And also interested in learning anything,anyone has to say about this so i can make good decisions in the future about prop selection .Thank you.