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Boat House
Basic trouble shooting
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<blockquote data-quote="DaleH" data-source="post: 421061" data-attributes="member: 15636"><p>Sounds like you're in the ballpark, but also try this ... (Prop Pitch x RPMs) / (Gear Ratio x Constant of 1056) = Theoretical Speed</p><p></p><p>FWIW I had a similar hull with mid-90s vintage Merc 40hp (propped correctly) and she'd turn screws for 30mph. I swapped out the OB and put a 60hp on it (wearing a load prop) and she'll hit 40mph without tripping the rev limiter.</p><p></p><p>What is the rated maximum RPMs of that motor? I'd pitch the prop so you turned no less than 200 RPMs off.</p></blockquote><p></p>
[QUOTE="DaleH, post: 421061, member: 15636"] Sounds like you're in the ballpark, but also try this ... (Prop Pitch x RPMs) / (Gear Ratio x Constant of 1056) = Theoretical Speed FWIW I had a similar hull with mid-90s vintage Merc 40hp (propped correctly) and she'd turn screws for 30mph. I swapped out the OB and put a 60hp on it (wearing a load prop) and she'll hit 40mph without tripping the rev limiter. What is the rated maximum RPMs of that motor? I'd pitch the prop so you turned no less than 200 RPMs off. [/QUOTE]
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