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Jon and V Boat Conversions & Modifications
Landau 1456 Jon Build
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<blockquote data-quote="Timtactical" data-source="post: 361025" data-attributes="member: 14700"><p>What kind of motor are you running? My evinrude 9.9-15 is a 12:29, so 29/12=2.41 gear ratio. I estimated that I had a .1 prop slip. Prop slip is the amount of loss. determined at a fraction.</p><p></p><p>Your pitch equals the amount of inches the propeller will move in 1 rotation without any loss. A 9 pitch prop will travel 9" in one revolution with zero slip.</p><p></p><p>A damaged propeller can cause a loss of performance, if anything you can remove it from the motor and clean up the edges where it is damaged. That will get you by until the prop is replaced.</p><p></p><p>I would fill out the calculator to the best of your knowledge.</p><p></p><p>A simple rule-of-thumb to follow when experimenting with prop pitch: At wide-open RPM, increasing the prop pitch reduces RPM by roughly 200 rpm's per one inch of pitch. So switching from a 21- to a 23-pitch prop will drop maximum RPM level approximately 400 rpm's. Going down in pitch size will have the opposite effect and increase maximum achievable RPM.</p></blockquote><p></p>
[QUOTE="Timtactical, post: 361025, member: 14700"] What kind of motor are you running? My evinrude 9.9-15 is a 12:29, so 29/12=2.41 gear ratio. I estimated that I had a .1 prop slip. Prop slip is the amount of loss. determined at a fraction. Your pitch equals the amount of inches the propeller will move in 1 rotation without any loss. A 9 pitch prop will travel 9" in one revolution with zero slip. A damaged propeller can cause a loss of performance, if anything you can remove it from the motor and clean up the edges where it is damaged. That will get you by until the prop is replaced. I would fill out the calculator to the best of your knowledge. A simple rule-of-thumb to follow when experimenting with prop pitch: At wide-open RPM, increasing the prop pitch reduces RPM by roughly 200 rpm's per one inch of pitch. So switching from a 21- to a 23-pitch prop will drop maximum RPM level approximately 400 rpm's. Going down in pitch size will have the opposite effect and increase maximum achievable RPM. [/QUOTE]
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Jon and V Boat Conversions & Modifications
Landau 1456 Jon Build
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