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

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

Answer: A left roll when you increase throttle is often caused by torque and P-factor effects from the propeller. When the motor spins faster, the propeller’s torque tends to roll the plane in the opposite direction of the propeller's rotation. Additionally, asymmetric thrust (P-factor) can cause the left wing to dip as the propeller disc angle changes with increased throttle.

To fix this, first check if your plane has any built-in left trim or rudder input to counteract this effect. If not, try these steps:

• Apply slight right aileron trim on your transmitter.
• Add a small amount of right rudder trim to help keep the plane straight.
• Ensure your motor and propeller are properly aligned and tightened.
• If you use a fixed wing, consider slightly adjusting the thrust line to counteract the roll.
• Practice gentle throttle increases to reduce sudden torque effects during takeoff.

These adjustments should help stabilise your plane when you increase throttle.