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 usually caused by torque and P-factor effects from the propeller. When the motor speeds up, the propeller’s rotation creates a twisting force that can roll the plane to one side, often the left. To fix this, first check your trim settings on the transmitter; you may need to add a small right aileron trim to counteract the roll. Next, inspect the control surfaces to ensure they move correctly and symmetrically. If the plane still rolls, try adding a slight right aileron input during takeoff and throttle increase. Another step is to adjust the angle of the motor or slightly offset the thrust line to the right, which helps counter torque. Finally, verify the weight distribution; uneven weight or a heavy battery on one side can worsen the roll. By combining trim adjustments, control checks, and minor mechanical tweaks, you can stabilise your plane when throttling up.