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Boat House
Sea Ark 1648mv porpoising after upgrading to 40-HP mercury
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<blockquote data-quote="Ranchero50" data-source="post: 323253" data-attributes="member: 1523"><p>What's the angle of attack when you are running at speed? Nose up, nose flat, or? What's the rear bottom of your hull look like? Bowed out or have a hook in it?</p><p></p><p>Ditto, battery up front at the very least.</p><p></p><p>You can also try adding a whale tail as it'll move the CG forward by shifting the wetted hull further back.</p><p></p><p>For troubleshooting:</p><p>Sandbags first, then move the battery if the sandbags help, then whale tail or home made trim tabs if it still porpoises.</p><p></p><p>Expect more of an issue when running into the wind or in chop as air builds up under the bow more at speed.</p><p></p><p>Been here, fix it.</p></blockquote><p></p>
[QUOTE="Ranchero50, post: 323253, member: 1523"] What's the angle of attack when you are running at speed? Nose up, nose flat, or? What's the rear bottom of your hull look like? Bowed out or have a hook in it? Ditto, battery up front at the very least. You can also try adding a whale tail as it'll move the CG forward by shifting the wetted hull further back. For troubleshooting: Sandbags first, then move the battery if the sandbags help, then whale tail or home made trim tabs if it still porpoises. Expect more of an issue when running into the wind or in chop as air builds up under the bow more at speed. Been here, fix it. [/QUOTE]
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Boat House
Sea Ark 1648mv porpoising after upgrading to 40-HP mercury
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