Rudder is the primary control surface of an aircraft. Rudder is attached at the rear end of the fuselage of the aircraft. The main function of the vertical stabilizer is to provide stability to the aircraft. The vertical stabilizer prevents side to side or yawing motion of the aircraft nose. The rudder which is attached to the vertical stabilizer by hinges produces a varying amount of force that is used to generate and control the yawing motion.

Rudder also helps during the motion of the aircraft. Aircraft gets turn by banking the aircraft with the use of ailerons or spoilers. Here rudder ensures that aircraft are properly aligned to the flight path.

Rudder

The torque generated depends on the lift produced by the amount of deflection of the rudder. The side force or lift is generated through the center of pressure of the vertical stabilizer which is at some distance from the aircraft’s center of gravity.