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post #5 of Old 10-04-2008
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evasion, We used to average 5kts with the westerbeke and were greatly reduced by wind and current. Although the westerbeke is rated as 40hp, unlike the yanmar, they are rated before that big paragon transmission that probably takes 10 of those 40hp! If I run the yanmar 56hp with its Kanzake transmission at the same rpm (2,500) as I ran the westerbeke I get 6.5 kts. and not as high a % loss with wind or current. I'm using a 18x13 three-blade prop that I could reduce the pitch and run more efficiently at a higher rpm as the yanmar is rated, but I'm close to hull speed and I like the manureability that I have by "goosing" the engine and making the stern kick about. My commercial tugboat friends say that this means the "boats got ass"! 'take care and joy, Aythya crew
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