1. What is the RC Plane Motor Calculation?

The RC plane motor calculation estimates the required motor power (in watts) based on the aircraft's weight, desired thrust ratio, and an empirical constant. This helps ensure your RC plane has adequate power for flight.

2. How Does the Calculator Work?

The calculator uses the motor power equation:

Where:

• \( P \) — Required motor power (watts)
• \( Weight \) — Aircraft weight (grams)
• \( Thrust\ Ratio \) — Desired thrust-to-weight ratio (unitless)
• \( Constant \) — Empirical factor (typically 0.011 for standard conditions)

Explanation: The equation accounts for the relationship between aircraft weight, desired performance (thrust ratio), and conversion to electrical power requirements.

3. Importance of Proper Motor Sizing

Details: Correct motor sizing is crucial for RC plane performance. An undersized motor won't provide enough thrust, while an oversized motor adds unnecessary weight and reduces flight time.

4. Using the Calculator

Tips: Enter aircraft weight in grams, thrust ratio (typically 0.7 for trainers, 1.0 for aerobatics, 1.5+ for 3D), and empirical constant (start with 0.011 and adjust based on experience).

5. Frequently Asked Questions (FAQ)

Q1: What's a good thrust ratio for beginners?
A: 0.7-0.8 is ideal for trainer aircraft, providing good flight characteristics without excessive power.

Q2: How does battery voltage affect this calculation?
A: The calculation gives total watts needed. You'll need to consider voltage (cells) and current (capacity) to select appropriate batteries.

Q3: Should I include battery weight in the calculation?
A: Yes, use the total flying weight including battery, electronics, and airframe.

Q4: What propeller factors affect this calculation?
A: Propeller size and pitch affect efficiency. The constant accounts for average efficiency with typical propellers.

Q5: How accurate is this estimation?
A: It provides a good starting point. Real-world testing with wattmeter is recommended for fine-tuning.