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  Proper prop for a Dauntless 15 ?

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Author Topic:   Proper prop for a Dauntless 15 ?
Florida15 posted 03-07-2004 08:11 PM ET (US)   Profile for Florida15   Send Email to Florida15  
I just bought a 1996 Dauntless 15 with an Evinrude 70 on it.
It jumps up on plane quickly but the top-end is lacking .
It's doing about 5000 RPM at 30 mph. It's got a 17 pitch
prop on it. Should I go to a 19 ?
What kind of performance should I expect out of this hull/motor combination ?
What is the max RPM I should push it ? It just seems that I still have throttle left at 5500 and about 33 mph.
This speed was measured by the speedo on the boat.
I'm not sure what kind of prop is on it. It's black but the guy I bought it from said a magnet will stick to it. That would rule out stainless and aluminum wouldn't it ? It seems to be metal.
Also, will a prop that fits a 1981 50 Johnson fit a 1996 70 Johnson ?
JohnJ80 posted 03-07-2004 08:59 PM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
Run through the prop calculator.

I have a Dauntless 15 with a 75HP evinrude FICHT on it. I installed a 15 pitch stiletto SS prop on mine and I get 42mph WOT at 5000rpm. That is the prop that stiletto recommended and they were right on.

Something doesn't sound right about the set up that you have. 30mph is way low for a prop that size at that RPM. Try the prop calculator in the reference section. I mean, I get 30mph at about 3200rpm or so.

Are you sure about the speed - how did you measure it. Generally, folks here measure their speed averaged over runs 180 degrees apart using GPS. Fishfinders and pitot tube speedos can be notoriously inaccurate.

J

Florida15 posted 03-07-2004 09:18 PM ET (US)     Profile for Florida15  Send Email to Florida15     
Thanks John. No, I'm not sure about the speed. I've only been out on the boat once and that was for a test run. I'm
just going by the instruments on the dash - the tach and the speedo. I pick the boat up tomorrow and I'll check it by GPS.

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