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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 250 Specific Forum
 Yanmar hull spd		  New Topic  Topic Locked
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rgreno
Deckhand

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Canada
3 Posts
Initially Posted - 08/06/2011 :  07:58:34  Show Profile
I have a c250 with a 9hp yanmar operating at 2300rpm hull spd is only around 3.2 knt I can't seem to get to hull spd? Am I running too low rpm what kind of spd should I expect? Any help is appreciated.
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At Ease
Admiral

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672 Posts
Response Posted - 08/06/2011 :  14:11:14  Show Profile
Your hull speed is 1.34 X the square root of your water line length. That speed should be attainable at 80% of WOT (wide open throttle). My 27 hp Yanmar's WOT is 3,600, so I get hull speed around 2,800 RPM. With a water line length of 28', the hull speed for my boat is 7.1.
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vholmstrom
1st Mate

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USA
51 Posts
Response Posted - 08/07/2011 :  08:46:18  Show Profile
The hull speed of a C250 is about 6.2 knots. My Tohatsu 9.8 with a 25 inch shaft and 4 bladed 5.5 inch pitch prop, pushes us to hull speed (per GPS) at less than 3/4 throttle. I usually motor between 4 and 5 knots where the engine is quiet and we use very little fuel.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.