Propeller Tip Speed

Determine propeller tip velocity, Mach numbers, and transonic efficiency zones under load.

⚙ Quick Presets

⚙ Propeller

Diameter (inch)

Diameter (mm)

⚡ Motor

KV Rating

RPM/V

RPM (no load)

RPM

🔋 Battery

Cell Count

Battery Type

Voltage

25.2V full / 22.2V avg

🌡 Environment

Temperature

°C Speed of sound: 343.2 m/s

Speed Unit

Theoretical (no load)

RPM--

Tip Speed--m/s

Mach--

Estimated Real (~75%)

RPM--

Tip Speed--m/s

Mach--

▲ Theo ▲ Real

00.620.880.921.0+

Efficient / Quiet Moderate Max Thrust Inefficient

Prop Tip Speed Calculator

📖 Overview

Calculate the absolute rotational speed at which propeller tips cut through the air, and monitor transonic aerodynamic limits to prevent prop flutter and power loss.

🛠️ How to Use

Enter your Propeller Diameter (inches), Motor KV rating, and Battery Cell Count (S) or custom voltage.
Adjust Ambient Temperature (°C) to account for how air density and the local speed of sound change with weather.
Observe the live Mach speedometer gauge to check whether your setup stays within efficient aerodynamic limits.

💡 Mach Velocity Zones

Below Mach 0.62: Highly efficient and quiet operation. Ideal for long-range and cinematic flight.
Mach 0.62 - 0.88: Optimal performance zone. High thrust with controlled acoustic noise.
Mach 0.88 - 0.92: Max thrust envelope. Airflow begins to compress near tip edges.
Above Mach 0.92: Transonic stall zone. Severe efficiency loss, heavy vibration, and acoustic roar.