1. What is a Propeller Pitch Speed Calculator?

Definition: This calculator estimates the theoretical maximum speed (pitch speed) that a propeller can move an aircraft through the air based on its RPM and pitch.

Purpose: It helps pilots, aircraft designers, and aviation enthusiasts understand propeller performance characteristics.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( S \) — Pitch speed (miles per hour)
• \( RPM \) — Revolutions per minute
• \( Pitch \) — Propeller pitch (inches)
• \( Constant \) — Conversion factor (typically 1056)

Explanation: The RPM multiplied by pitch gives inches per minute, which is converted to mph by dividing by the constant (12 inches/foot × 5280 feet/mile ÷ 60 minutes/hour).

3. Importance of Pitch Speed Calculation

Details: Pitch speed helps determine if a propeller is properly matched to an aircraft's performance requirements and engine capabilities.

4. Using the Calculator

Tips: Enter the propeller RPM, pitch in inches, and conversion constant (default 1056). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does pitch speed represent?
A: It's the theoretical maximum speed the aircraft could achieve if there were no slip or drag.

Q2: Why is the constant 1056?
A: This converts inches per minute to miles per hour (12 in/ft × 5280 ft/mile ÷ 60 min/hour).

Q3: How accurate is pitch speed compared to actual speed?
A: Actual speed is typically 80-90% of pitch speed due to propeller slip and airframe drag.

Q4: Does this work for all propeller types?
A: Yes, but fixed-pitch propellers will show more consistent results than variable-pitch ones.

Q5: How does pitch affect performance?
A: Higher pitch provides better high-speed performance but requires more engine power.