strikerone,

Adverse yaw occurs because the aileron that deflects downward increases both lift and drag on that wing of the airplane. If you feed in left aileron, the right aileron deflects down and the left one up. Drag on an airplane has two major components, drag from the shape of the aircraft and lift induced drag. In straight and level flight, the lift induced drag is the same on both wings of the aircraft. Aileron deflection changes the lift induced drag. It increases it on the right wing (in our left roll example) and reduces it on the left wing. This difference in induced drag creates a yaw force that tends to pull the nose of the aircraft opposite the direction of the roll. Roll left induces a yaw to the right. Hence the term adverse yaw.

Onbe technique to reduce this adverse yaw is to set up the ailerons to have more up deflection than down deflection. This can be dome mechanically. However, with torque rods, you are limited to the off center holes in your servo arms. With independent aileron servos, you can set the differential mechanically by adjusting the position of the output arm and with a radio with mixing, you can fine tune it electronically.

Hope this helps.


Rob