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GLOSSARY
AFR (Adjustable function rate/high rate)
Adjusts the total travel in each direction of a particular function, such as ailerons. For example, used to
elevons, or other programming.
Aileron Differential
the drooped aileron which causes a model to yaw with aileron input.
Ailerons
Hinged control surfaces located on the trailing edge of the wing, one on each side, which provide control of
roll or turn, the right-hand aileron is moved upward and the left-hand aileron downward, and vice versa for
a left roll or turn.
Airfoil
For helis: The rotor disk is the effective wing, and airfoil refers to the shape of the blades.
Amphibian
type of aircraft. An amphibian can land on water and then extend the landing gear to allow it to pull up onto
the shore. Many seaplane bases had ramps to allow the airplanes to pull up onto dry land parking areas.
Angle of attack
The angle that the wing penetrates the air. As the angle of attack increases so does lift, up to a point (and
drag).
Area
area of a tapered wing is the wingspan multiplied by the average chord.
Aspect Ratio
short aspect ratio (short wings) is better for maneuvering, since it allows a high roll rate. Short wings are
also stronger than long wings. Gliders use high-aspect ratio wings (long, skinny wings) because they are
Autorotation
The ability of a rotary-wing aircraft to land safely without engine power. This maneuver uses the stored
energy in the rotor blades to produce lift at the end of decent, allowing the model to land safely.
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