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Boat House
Sea Ark 1648mv porpoising after upgrading to 40-HP mercury
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<blockquote data-quote="flatboat" data-source="post: 323584" data-attributes="member: 5508"><p>I think once you have it propped right it may go away . get a tiny tack to check rpms. Get rpms in upper end of operating range by changing prop. There may be shops around you that will let you 'try before u buy ' . start with prop shaft parallel to boat bottom , not even with the bottom , this will provide the best in line push . load with about your normal load, go try it, record rpms . about 300 rpms per inch of pitch . if it turns 6500 rpms and the operating range is 5500 to 6000 rpms you would I need to use a prop with 2" more pitch ,that would get it down to 5900 rpms ,just an example . .once you get rpms right . work on load distribution .It will take a while and a couple buxs and time to get it right . Do 1 thing at a time , sometimes a boat will bounce at a particular speed all it needs is to go a tiny bit faster to get past that speed. Just remember ,all that time you are tryin' things you are on the water and not at work !</p></blockquote><p></p>
[QUOTE="flatboat, post: 323584, member: 5508"] I think once you have it propped right it may go away . get a tiny tack to check rpms. Get rpms in upper end of operating range by changing prop. There may be shops around you that will let you 'try before u buy ' . start with prop shaft parallel to boat bottom , not even with the bottom , this will provide the best in line push . load with about your normal load, go try it, record rpms . about 300 rpms per inch of pitch . if it turns 6500 rpms and the operating range is 5500 to 6000 rpms you would I need to use a prop with 2" more pitch ,that would get it down to 5900 rpms ,just an example . .once you get rpms right . work on load distribution .It will take a while and a couple buxs and time to get it right . Do 1 thing at a time , sometimes a boat will bounce at a particular speed all it needs is to go a tiny bit faster to get past that speed. Just remember ,all that time you are tryin' things you are on the water and not at work ! [/QUOTE]
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Boat House
Sea Ark 1648mv porpoising after upgrading to 40-HP mercury
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