Propeller Tip Speed Calculator

Tip Speed Formula:

\[ TS = \frac{π \times D \times RPM}{60} \]

Tip Speed (ft/s):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is a Propeller Tip Speed Calculator?

Definition: This calculator determines the linear speed at the tip of a rotating propeller based on its diameter and rotational speed.

Purpose: It helps engineers, pilots, and marine/aerospace professionals ensure propeller speeds remain within safe operating limits.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ TS = \frac{π \times D \times RPM}{60} \]

Where:

\( TS \) — Tip speed (feet per second)
\( D \) — Propeller diameter (feet)
\( RPM \) — Revolutions per minute
\( π \) — Pi (approximately 3.14159)

Explanation: The formula converts rotational speed to linear speed at the propeller's outermost point.

3. Importance of Tip Speed Calculation

Details: Tip speed affects efficiency, noise levels, and structural integrity. Excessive tip speeds can cause cavitation (in water) or approach supersonic speeds (in air), leading to performance issues.

4. Using the Calculator

Tips: Enter the propeller diameter in feet and rotational speed in RPM. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical tip speed for boat propellers?
A: Marine propellers typically operate at 50-150 ft/s to avoid cavitation.

Q2: How does tip speed relate to aircraft propellers?
A: Aircraft propellers usually stay below 850 ft/s to prevent noise and efficiency loss from transonic effects.

Q3: Why divide by 60 in the formula?
A: This converts minutes to seconds since tip speed is measured in feet per second.

Q4: Can I use this for wind turbine blades?
A: Yes, the same formula applies to any rotating blade system.

Q5: What if my diameter is in inches?
A: Convert inches to feet by dividing by 12 before entering the value.