Why Does My RC Plane Roll to the Left When I Increase Throttle?

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Question: Why does my RC plane roll left when I throttle up?

Answer: When your RC plane rolls left as you increase throttle, it’s usually caused by asymmetric thrust effects. The main reasons include torque from the propeller, P-factor, and engine offset. First, the propeller’s rotation creates a torque that tends to roll the plane in the opposite direction. If your prop spins clockwise (from the pilot’s perspective), it will roll left. To correct this, try the following steps:

  1. Check your aileron trims and adjust them slightly right to counteract the roll.
  2. Ensure your control surfaces are correctly centred at neutral stick.
  3. If your plane has adjustable motor mounts, angle the motor slightly right to offset torque.
  4. Consider adding a small amount of right rudder trim to help maintain straight flight.
  5. Test fly after each adjustment to find the best balance.

These tweaks help counteract the natural forces causing the roll. If you’re using a 3D printed or homebuilt airframe, verify the motor and propeller are installed correctly. Proper setup ensures smooth, level flight when you throttle up.

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