Why does my RC plane roll to the left when I increase throttle?

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 due to torque and P-factor effects from the propeller. The engine’s torque tries to rotate the plane in the opposite direction of the propeller spin, causing a roll or yaw. To fix this, first check your plane’s setup: ensure the control surfaces are neutral and trims are correctly set. Next, try adding a small amount of right aileron or rudder trim to counteract the left roll. You can also adjust the motor mount slightly to angle the thrust line to the right, which helps balance the torque effect. Another tip is to test with a different propeller or motor if possible, as some combinations produce stronger torque. Finally, practice smooth throttle increases to minimise sudden torque-induced roll. With these adjustments, your plane should fly straighter when you apply throttle.