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evinrude 15 and 1236 how to get a lil more mph?
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<blockquote data-quote="Johny25" data-source="post: 327851" data-attributes="member: 7791"><p>The prop could be closer to a 10 pitch than a 9 pitch, could be mis-stamped or the tach and GPS could be both off just a little? I doubt your prop was bent or it would likely vibrate or shudder real bad. </p><p></p><p> Hey is that a stainless prop? If it is it could have been worked on by a prop shop and could have had a pitch change done to it. They can change pitch on SS props about 1 step or one inch in pitch. It is a possibility....</p><p></p><p> Also going up in pitch will decrease RPM. So if you went up one inch in pitch you will typically drop about 200 rpm</p><p></p><p> Theoretically...you have a 9" pitch which you run at roughly 6600 rpm so a 10" would put you at about 6400....... 11" 6200 rpm and so on. Pitch is the theoretical distance a prop will travel through a solid mass per revolution. A 9" pitch will travel 9" in one revolution if it traveled through a solid mass with 0% slip.</p></blockquote><p></p>
[QUOTE="Johny25, post: 327851, member: 7791"] The prop could be closer to a 10 pitch than a 9 pitch, could be mis-stamped or the tach and GPS could be both off just a little? I doubt your prop was bent or it would likely vibrate or shudder real bad. Hey is that a stainless prop? If it is it could have been worked on by a prop shop and could have had a pitch change done to it. They can change pitch on SS props about 1 step or one inch in pitch. It is a possibility.... Also going up in pitch will decrease RPM. So if you went up one inch in pitch you will typically drop about 200 rpm Theoretically...you have a 9" pitch which you run at roughly 6600 rpm so a 10" would put you at about 6400....... 11" 6200 rpm and so on. Pitch is the theoretical distance a prop will travel through a solid mass per revolution. A 9" pitch will travel 9" in one revolution if it traveled through a solid mass with 0% slip. [/QUOTE]
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evinrude 15 and 1236 how to get a lil more mph?
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