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Prop Pitch Formula:
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Propeller pitch is the theoretical distance a propeller would move forward in one complete revolution, assuming no slip. It's a critical parameter in marine propulsion that determines how efficiently a boat moves through water.
The calculator uses the prop pitch formula:
Where:
Explanation: The formula calculates the theoretical pitch required based on actual performance metrics, 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-performing engines.
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 and valid.
Q1: What is propeller slip?
A: Propeller slip is the difference between theoretical and actual distance traveled per revolution, expressed as a percentage. It accounts for water resistance and efficiency losses.
Q2: What is a typical propeller slip percentage?
A: Most efficient propellers operate with 10-20% slip. Higher slip indicates less efficiency, while very low slip may indicate incorrect measurements.
Q3: How does gear ratio affect prop pitch?
A: Gear ratio determines how many propeller revolutions occur per engine revolution. Higher gear ratios require different pitch calculations for 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 and test performance. Small adjustments (1-2 inches) can be made, but significant deviations require professional consultation.