How to Choose an RC Airplane Motor
Choosing the right motor for your RC airplane ensures the performance and flight time you want. This guide covers KV, propeller matching, and sizing for trainers, sport planes, and scale models.
Step 1: Match Motor to Wingspan
- Park flyers (< 800mm): 2204–2208, 1800–2300KV
- Trainers (800–1200mm): 2208–2212, 1100–1400KV
- Sport planes (1200–1500mm): 2814–2820, 900–1200KV
- Large scale (> 1500mm): 3520+, 500–900KV
Step 2: Pair Propeller
Lower KV motors spin larger propellers efficiently. Match propeller diameter and pitch to your motor’s KV and battery voltage for the desired thrust.
Step 3: Balance Thrust-to-Weight
Aim for 1:1 thrust-to-weight for sport flying, or higher for aerobatics. This ensures comfortable climb and recovery.
Frequently Asked Questions
What KV for a trainer plane?
A 1100–1400KV motor with a 9–10 inch prop on 3S is ideal for most trainers.
How do I know if my motor is right?
Check the manufacturer’s thrust table for your propeller, and confirm the motor stays within its current and temperature ratings at full throttle.
Find Your Motor
Share your wingspan and flying style for a recommendation.