Aeromodelling

Control surfaces are the moving parts of an airplane that adjust it flight path. There are several control services that have been standardized and used in most common R/C model aircrafts as well as the real aircrafts. The three primary flight controls are the ailerons, elevator and rudder. Other flight control surfaces like flaps, slots, slats and trim tabs are to improve the flight control and stability of the aircraft.

The angular movement of control surface basically is to change the Angle of Attack of the aerofoil. The Angle of Attack of the aerofoil change is to generate aerodynamic forces (lift and drag forces). This aerodynamic force cause the aircraft rotate about the three imaginary axles which intersected at the center of gravity at right angles to each other.

Ailerons:
Ailerons are the control surfaces that located on the outer trailing edge of each wing. They serve the purpose of adjusting the roll of the airplane. The two ailerons always move in opposite directions to create aerodynamic forces on the wings cause the aircraft rolls about the longitudinal axis. They also are used to turn the airplane, although unless rudder is added the turn will be sloppy.

Elevator:
Elevators are used to control the planes pitch or up down motion. Elevators are hinged to the horizontal stabilizer (tailplane) at the rear side to form a single airfoil. The elevators up and down motion generated a force to press or lift up the tailplane to controls the movement of the aircraft about its lateral axis. Another word it makes the aircraft climb and descend.

Rudder:
Rudder is to control yawing motion of the aircraft. It vertically attach on the vertical stabilizer (tail fin). A small change in angular motion of rudder there is changes in angle of attack of the vertical stabilizer (tail fin). The dynamic forces generated due to angular movement of the rudder to cause the aircraft rotate about its vertical axis.