High altitude operation

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psan diego

Recruit
Joined
Apr 28, 2011
Messages
1
I am taking my 2005 Searay Bravo 3 Mercruiser 260 hp boat from San Diego to Lake Tahoe for a trip. In the past it would not even get on plain when I go sea level to high altitude. It has a 24P prop on it. If I buy and install a 20p prop will that do the job?
 
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steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: High altitude operation

I don't know the elevation but I can tell you they you will lose about 3% for each 1000 ft.
If it ever planed you could use that rpm to figure a prop change better.
A 20" is about a 16% change it surely will plane.Whether it will reach rpm your guess is as good as mine.
 
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fishrdan

Admiral
Joined
Jan 25, 2008
Messages
6,989
Re: High altitude operation

psan diego said:
It has a 24P prop on it. If I buy and install a 20p prop will that do the job?
Click to expand...

That sounds about right to me. Kind of depends on the WOT RPM you are getting at sea level right now. For that elevation I drop 4" of pitch with my rig, or should I say I drop 4" of pitch while I'm at lakes 6000-9000'.

Run your rig through thisprop selector and see what it spits out. It worked pretty well for me.
 
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