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Propeller Pitch Formula:
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Propeller pitch is the theoretical distance a propeller would move forward in one complete revolution, measured in inches. It's a crucial parameter in marine propulsion that determines how efficiently a boat moves through water.
The calculator uses the propeller pitch formula:
Where:
Explanation: The formula calculates the theoretical pitch needed based on actual performance data, accounting for propeller slip which represents efficiency loss.
Details: Proper propeller pitch selection is essential for optimal boat performance, fuel efficiency, and engine longevity. Incorrect pitch can lead to over-revving or under-powering the engine.
Tips: Enter speed in mph, gear ratio as a decimal number, RPM as revolutions per minute, and propeller slip as a percentage (0-100%). All values must be positive numbers.
Q1: What is propeller slip?
A: Propeller slip is the difference between theoretical and actual distance traveled, expressed as a percentage. It accounts for efficiency losses due to water resistance and other factors.
Q2: What is a typical propeller slip percentage?
A: Most efficient propellers operate with 10-20% slip. Higher slip indicates inefficiency, while very low slip may suggest incorrect measurement or calculation.
Q3: How does gear ratio affect propeller pitch?
A: Gear ratio determines how engine RPM translates to propeller RPM. Higher gear ratios require different pitch calculations to achieve optimal performance.
Q4: Can I use this calculator for different boat types?
A: Yes, the formula applies to various boat types, but optimal pitch may vary based on hull design, weight, and intended use.
Q5: What if my calculated pitch doesn't match available propellers?
A: Choose the closest available pitch. Small adjustments (1-2 inches) can be made, but significant differences may require consulting with a marine specialist.