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conrad4784

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I have a 2005 24ft seapro cc eith a 2006 250 hp etec that will only get up to 5k rpm. I'm thinking in need to change my prop so that it will get to 6k at wot. Any suggestions on prop size? Current prop is 14.75 x 19
conrad4784

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Reply with quote  #2 
Maybe 4800 pounds with fuel gear and people
conrad4784

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Current top speed is 41mph at wot of 5200rpm
muskiemouth

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Reply with quote  #4 
15 inch Rebel
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2015 Campion Chase 580 BR, 2016 G2 Etec 225 HO (E225LHAG)
Huey

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Reply with quote  #5 
+1 to the Rebel but first make sure the engine is not too low and they are accurate WOT RPM figures.
conrad4784

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Reply with quote  #6 
The engine is not to low and the rpm are accurate I just had it serviced and computer reading were the same as the dash gauge. What pick is the 15inch rebel..i do have a 15.75 diameter with 17 pitch instead of the 19 from a project boat but wasnt sure if it would help.
Huey

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Reply with quote  #7 
I am guessing you mean "pitch" and a 15 inch Rebel is a 15 inch prop and that is basically the most important part when talking props-that is what affects RPM.
conrad4784

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Reply with quote  #8 
Bigger prop size = lower rpm what does a lower pitch do ? Thank you
Huey

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Reply with quote  #9 
The opposite to what you just said-higher RPM all else being equal. You have not told us what prop you currently have, I am guessing a Viper due to the diameter and yes going from a 19 inch Viper to a 17 inch Viper will gain approx 300-400RPM on most hulls. Rebels perform differently again.
muskiemouth

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Reply with quote  #10 
The Rebel will push a heavy setup a lot better than Viper. If you put a 19 rebel on your boat the rpms would drop, even though they have the same pitch.
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conrad4784

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Reply with quote  #11 
I did say it was a 14.75x19 I didn't know the manufacturer mattered I'm sorry
conrad4784

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Reply with quote  #12 
It is a viper sounds like I need a rebel
Huey

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Reply with quote  #13 
Viper is not the manufacturer, it is the style of prop and why we ask the sort of questions we ask so we can give you an informed answer. As I said i guessed it was Viper so the dimensions and as muskie said the Viper is the least desirable prop for such a heavy hull. Nothing wrong with them per say but not as suited as say a Rebel, Cyclone, Rx4 or the many aftermarket props around.
conrad4784

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Reply with quote  #14 
Thanks you for explaining this prop stuff to me
Cresco750

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Quote:
Originally Posted by conrad4784
The engine is not to low and the rpm are accurate I just had it serviced and computer reading were the same as the dash gauge. What pick is the 15inch rebel..i do have a 15.75 diameter with 17 pitch instead of the 19 from a project boat but wasnt sure if it would help.


If it were me I'd be putting that spare prop you have on and try it before I rushed out and spend all that money on a new one (assuming it's correct rotation, hub etc for etec?).
I've got same engine and what sounds like a similar sized boat to what you describe. When my motor was first fitted it came with an old OMC 15x15 prop which yielded 6250rpm: too high. I then tried a similarly old OMC 14.75 x 19 which now gives me 5800rpm. Im happy with the performance that I have now although I would love to try a Rebel......but unfortunately it's out of my price range at the moment.

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2006 Etec 250
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