Propeller Pitch Calculator
Calculate optimal prop pitch based on engine RPM and desired speed
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Propeller Analysis
Recommended Pitch Change
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Optimal Pitch
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RPM Difference
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Current Prop Shaft RPM
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Theoretical Speed
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Estimated Slip
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Pitch Change Effects
| Change | RPM Effect | Best For |
|---|---|---|
| +2" pitch | -300-400 RPM | Too much RPM, more speed |
| +1" pitch | -150-200 RPM | Slight over-rev |
| Correct | At rated WOT | Optimal performance |
| -1" pitch | +150-200 RPM | Can't reach WOT |
| -2" pitch | +300-400 RPM | Heavy load, bad hole shot |
About Propeller Pitch
Pitch Definition: Propeller pitch is the theoretical distance (in inches) the propeller would move forward in one revolution if there were no slip.
Rule of Thumb: Each inch of pitch change typically results in 150-200 RPM change. Increasing pitch lowers RPM and vice versa.
Proper Propping: Engine should reach manufacturer's rated WOT RPM range when fully loaded and trimmed for best speed. Under-propping causes over-revving; over-propping causes lugging.
Slip: Typical propeller slip is 10-20% for efficient props, higher for workboat props. Less slip generally means better efficiency.