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Boat House
How fast should I go
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<blockquote data-quote="Johny25" data-source="post: 260636" data-attributes="member: 7791"><p>I am sorry but I am not buying 39.6mph with a 25hp johnson unless it is on a hydroplane with a different gear ratio turning a racing prop.</p><p></p><p> In order for you to hit 39.6 mph with your 89' 25 that has a 2.15:1 gear ratio you would have to turn a 15 pitch prop at 6100 rpm with ZERO prop slip! Not even theoretically possible, I'm sorry your GPS must not be correct. </p><p></p><p> So what pitch prop are you running and what sort of RPM are you turning. More realistic numbers would be 29-32 tops with that engine and gear ratio. Unless like mentioned above you have it on a 100lb hydroplane</p></blockquote><p></p>
[QUOTE="Johny25, post: 260636, member: 7791"] I am sorry but I am not buying 39.6mph with a 25hp johnson unless it is on a hydroplane with a different gear ratio turning a racing prop. In order for you to hit 39.6 mph with your 89' 25 that has a 2.15:1 gear ratio you would have to turn a 15 pitch prop at 6100 rpm with ZERO prop slip! Not even theoretically possible, I'm sorry your GPS must not be correct. So what pitch prop are you running and what sort of RPM are you turning. More realistic numbers would be 29-32 tops with that engine and gear ratio. Unless like mentioned above you have it on a 100lb hydroplane [/QUOTE]
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How fast should I go
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