1. What is the RC RPM Calculation?

The RC RPM calculation estimates the rotational speed of an electric motor in revolutions per minute (RPM) based on the motor's kV rating, battery voltage, and throttle percentage. This helps RC enthusiasts understand their motor's performance.

2. How Does the Calculator Work?

The calculator uses the RC RPM equation:

Where:

• \( kV \) — Motor velocity constant (RPM per volt)
• \( \text{Battery Voltage} \) — Voltage of the power source (V)
• \( \text{Throttle} \) — Throttle percentage applied (0-100%)

Explanation: The equation calculates the theoretical maximum RPM at full throttle, then scales it based on the actual throttle percentage.

3. Importance of RPM Calculation

Details: Knowing the RPM helps in selecting proper propellers, predicting aircraft performance, and ensuring the motor operates within safe limits.

4. Using the Calculator

Tips: Enter the motor's kV rating, battery voltage, and throttle percentage. All values must be valid (kV > 0, voltage > 0, throttle between 0-100).

5. Frequently Asked Questions (FAQ)

Q1: What is kV in RC motors?
A: kV represents how many RPM the motor will turn per volt with no load. A 1000kV motor will spin at 1000 RPM per volt at full throttle with no load.

Q2: Is this the actual RPM under load?
A: No, this is theoretical no-load RPM. Actual RPM under load will be lower due to efficiency losses and load factors.

Q3: How does battery voltage affect RPM?
A: Higher voltage directly increases RPM proportionally. A 2S battery (7.4V) will give half the RPM of a 4S battery (14.8V) with the same motor.

Q4: What's a typical kV range for RC motors?
A: Typically 100-3000kV, with lower kV for larger props/aircraft and higher kV for smaller props/aircraft.

Q5: Why calculate RPM at partial throttle?
A: It helps understand performance at different throttle settings, which is important for flight characteristics and battery life.