Airfoil
The specific shape of a wing at side cross-section with aerodynamic function

Angle-Of-Attack (AoA)
The angle of the center-line of a wing at side cross-section or airfoil relative to inbound air flow.

ATRF (Almost-Ready-to-Fly)
An RC kit which is pre-assembled and requires only assembly & installation of its major components, such as the engine, receiver, servo and transmitter.

Blade-Pitch
The pitch which corresponds to the angle-of-attack of a set of blades. The pitch of the main rotor blades determine the vertical attitude of a helicopter, while the pitch of the tail rotor determines the directional attitude of the helicopter.

Center of Gravity (CG)
The point of balance of an aircraft.

Channel
The number of control axis an rc aircraft has. It is also the frequency number which the transimtter is operating on. Official frequencies for rc aircraft is in the 35 MHz band for UK

Chord
The distance between the leading edge and the trailing edge of an airfoil

Crystal
An electronic reference component in the transmitter and receiver which determines the frequency or channel the radio is operating on.

Engine Mount
A set of mechanical components which holds the engine in place in an aircraft. These are usually included in most ARF kits.

Fuselage
The main body of an aircraft.

Glow Fuel
Fuel for RC Aircraft made of a mixture of methanol, nitro methane, castor oil and synthetic lubricants to protect the engine. Glow fuels are rated by percentage of nitro content, the most common being 10%, 15% and 20%.

Leading Edge
The front edge of a wing or airfoil facing the incoming air flow.

Main Rotor
The rotor of a helicopter which provides the lift needed for flight.

Nitro (Nitromethane)
Chemical which is usually added in fuel for better performance.

Pitch-Axis
The axis which refer the angle-of-attack or the nose-up / nose-down attitude of an aircraft in flight.

Receiver
The receiving part of a radio control set which is usually located in the aircraft. The receiver takes the control signals from the transmitter part and activate the appropriate servos or actuators.

Roll-Axis
The axis which refer the bank-left / bank-right attitude of an aircraft in flight.

RPM (Rotation-Per-Minute)
A measure of the number of rotation or complete cycle a device or component achieves within 1 (one) minute of timeframe.

RTF (Ready-To-Fly)
An RC kit which is completely assembled and is ready to be flown right out of the box with the exception of preparing the needed power source, such as charging the battery.

Scale Aircraft
RC Aircraft which is modeled after a real aircraft with actual scaled composition of its real counterpart.

Swashplate
A surface controlling plate at the center of the main rotor which determines the attitude of the helicopter in flight.

Tail Rotor
The rotor of a helicopter which provide directional stability or (yaw) attitude of flight.

Throttle
A lever of control which determines the engine rpm.

Trailing Edge
The back edge of a wing or airfoil facing outgoing air flow.

Vertical Stabilizer
A vertical tail wing which provides horizontal stability of an aircraft.

Yaw-Axis
The axis which refer the left-right (directional) or horizontal attitude of an aircraft in flight.