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Old 19 October 2011, 12:38   #1
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Country: USA
Length: 6m +
Join Date: Jul 2010
Posts: 3
Where's the power?

I have a 2011 Zodiac Pro 15 man Rib with a Yamaha 150 Four Stroke. Yamaha perfomance tested this exact boat, motor and prop.(the prop is a SS 13-3/4 x 19) Yamaha states in there test the boat reached a max rpm of 5800 and a speed of 52 mph. My boat on the other hand only reached 5100 rpm and 42 mph. The conditions were near identical with Yamaha's test: sea's, wind, weight etc..
My question is does anyone have a similar boat and motor setup as mine and what kind of performance are you getting out of it?
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Old 19 October 2011, 12:45   #2
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Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
You have a bunch of extra weight aboard? Agree you should be turning higher rpm and faster with a 150hp. Is the prop the EXACT same prop or maybe a slightly different model with different blade dimensions SS vs. Ali or something else changed?
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Old 25 October 2011, 16:27   #3
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Country: UK - Scotland
Town: Glasgow
Boat name: Baby B
Length: 5m +
Engine: Evinrude
Join Date: Aug 2011
Posts: 30
Is the engine at the same hight ?
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