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 increasing throttle is usually caused by torque and P-factor effects from the propeller. The engine’s rotation creates a torque reaction that makes the plane roll in the opposite direction. Additionally, P-factor causes asymmetric thrust, pushing the nose to one side at higher power. To fix this, first check your control surfaces and ensure ailerons are neutral at mid-stick. Next, apply a small amount of right aileron trim to counteract the left roll. If your transmitter supports dual rates or exponential, adjust these settings for smoother control. Also, verify that your motor and propeller are securely mounted and not bent, as this can worsen the effect. Finally, consider adding a slight right thrust angle by adjusting the motor mount if your model allows, which can help compensate for the torque effect. Testing these steps should reduce or eliminate unwanted left rolling when throttling up.