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Old 03-22-2009, 05:17 PM
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Question 21 foot robalo cuddy

how do you know or size your boat for a prop. I have a yamaha 250 hp on the back of it with a 21 inch prop. not yet in the water
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Old 03-22-2009, 05:34 PM
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you will need to see what your RPM ia at WOT check robalo web site
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Old 03-25-2009, 09:10 AM
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I have a 21 center console with a 225 mercury. I am spinning a 17 inch mirage plus. Gets me to 5500 RPM and 46-50 mph depending on load. I think you may be a little heavier, but you have more hp. Your 21 pitch may be too large.

Have fun with it.
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Old 03-25-2009, 06:30 PM
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Hi I have a 2000 2420 with a merc 250 and it has a mercury marine mirage plus 48-18278 17 P. I know this cause I am reading it off the papers that came with the boat. Good luck!
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