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Author Topic:   PROP RECOMMENDATION
Bear posted 02-06-2003 04:58 PM ET (US)   Profile for Bear   Send Email to Bear  
Recommendations would be welecome for prop on 200HP Yamaha/99 on 88 20'Outrage. Thanks in advance
OutrageMan posted 02-06-2003 05:59 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
Some questions need to be answered before any help could be offered.

1) What size/type is on it now (pitch, diameter, material #blades)?

2) What is the current RPM at WOT?

3) What is the mfg suggested operating RPM at WOT?

4) What would you like the new prop to do (better hole shot, more efficent cruising, pulling water toys/skiers)?

With this information we can better help you out. Anything advice without it would not help at all.

Brian

cdnturbo posted 02-06-2003 06:06 PM ET (US)     Profile for cdnturbo  Send Email to cdnturbo     
I have a 1989 20' Outrage with a 1994 200hp merc.
my prop is a 14 X 19 cupped ss prop and seem s to work great.
My wot is about 5700rpm and fully loaded with gas and people I get about 44 mph
Bear posted 02-06-2003 06:36 PM ET (US)     Profile for Bear  Send Email to Bear     
No prop yet....I'm re-engining the boat and the motor is coming without a prop. I heard through other sources that a 15 1/4 - 17, stainless steel might work well also.
Bear posted 02-06-2003 06:38 PM ET (US)     Profile for Bear  Send Email to Bear     
Sorry....neglected to mention that will it will be for general use, ie fishing, skiing now and then, cruising around.
jimh posted 02-07-2003 12:44 AM ET (US)     Profile for jimh  Send Email to jimh     
What is your target boat speed?

That is the lower unit gear ratio of your engine?

Bear posted 02-07-2003 10:30 AM ET (US)     Profile for Bear  Send Email to Bear     
Gear ratio is 1.86, target boat speed isn't as important as making sure the engine is within recommended maxRPM range (5500) with a prop for general purpose boating. Some boats are easier to push than others, not sure what could be expected for 20' 89 outrage.
Bigshot posted 02-07-2003 11:02 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Bear....I owuld think a 19 would be the one. Reason being my 20 Hydra is running a 19 with a 225 that turns 6k WOT. Your boat is lighter and with a 5500 redline, she should be able to hit it or come real close. 17" would be for a 150 in my eyes.
OutrageMan posted 02-07-2003 05:46 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
I was thinking a 19" pitch Merc Mirage Plus. Maybe even a 21" but that maybe a bit to tall.

Brian

lhg posted 02-07-2003 07:03 PM ET (US)     Profile for lhg    
I agree with 19" pitch. Top speed should be about 50mph, at least that's what Mercury's prop chart shows. Gear ratios are the same.

I strongly recommend a vented performance grade, bow lifting, SS prop, either by Yamaha or Mercury (has hub to fit Yamaha). Because the boat is light, and fully powered, I'd go with a Merc Laser II. I run those on both of my Whalers.

jimh posted 02-07-2003 10:54 PM ET (US)     Profile for jimh  Send Email to jimh     
Bear,

You can estimate the boat speed potential if you know the weight, the horsepower, and the hull factor.

See http://continuouswave.com/whaler/reference/performancePrediction.html

For a 20-Outrage and 200-HP it predicts around 43-MPH.

Once you have a target speed, you can use the PROPELLER CALCULATOR to work out the pitch.

See http://continuouswave.com/cgi-bin/propcalc.pl

The 19-inch pitch propeller come out to about 48-MPH. A 17-pitch works out to about 44-MPH..

Bear posted 02-08-2003 06:59 AM ET (US)     Profile for Bear  Send Email to Bear     
Thanks to all for the info...much appreciated!

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