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Covering: Made out of vinyl or polyester. Covering
has heat sensitive adhesive that, when heated, sticks to
the wood frame of the airplane. The Thermal-Air EP
uses heat sensitive polyester covering.
Covering Iron: A small hand-held iron, usually
Teflon
®
coated. It is used to heat and apply cover-
ing material.
Cycling: The act of fully charging and discharging
the flight battery. Cycling the battery increases per-
formance and duration.
Dihedral: The upward angle of each wing half. Di-
hedral creates more stability which makes learning
to fly much easier.
Dihedral Brace: Made out of plywood, aluminum
or steel, the dihedral brace strengthens the joint be-
tween different wing sections.
Elevator: The elevator is the control surface on the
back of the airplane that moves up and down. This
surface controls pitch.
EPA: An acronym for End Point Adjustments. This
is a feature found on newer radio systems that allows
you to electronically adjust the end-travel in servos.
Epoxy: A two-part glue containing a resin and a
hardener. Epoxy is available in several drying times
and is stronger than C/A glue. Epoxy is used in high
stress areas such as joining wing halves.
ESC: An acronym for Electronic Speed Control. See
Motor Controller.
Hinges: Usually made out of plastic or nylon, the
hinges connect the control surfaces to the stabilizers
or wing. They pivot, allowing the control surface to
move.
Horizontal Stabilizer: Mounted in the rear of the
airplane, the stabilizer works with the elevator to con-
trol pitch.
Landing Gear Strap: Usually made out of ny-
lon, it secures the landing gear wires to the wing
or fuselage.
Motor Controller: Usually called an electronic
speed control (ESC), the motor controller controls
the speed of the motor. Motor controllers can also be
simple on and off switches.
Peak Charger: A type of battery charger that uses a
microprocessor to sense when the flight battery is
fully charged. Once peak charged, the charger shuts
off so the battery does not overcharge.
Pushrods: They connect between the control sur-
face and the servo, transferring the movement of the
servo directly to the control surface.
Pushrod Housing: A tube that is usually nylon. The
pushrod wire runs through the housing.
Receiver: The part of the radio system that receives
the signals from the transmitter.
Root Rib: The most inboard rib of any wing panel.
Rudder: The rudder is the control surface on the
back of the airplane that moves right and left. This
causes the nose of the airplane to yaw right and left.
Servo: The part of the radio system that produces
the movement necessary to move the control surfaces.
The servo includes a small motor, gears and a circuit
board.
Servo Reversing: An option on most all new ra-
dios. Servo reversing allows you to change the
direction a servo rotates by just flipping a switch on
the transmitter.
Servo Tray: Usually made out of plywood, the servo
tray is the mounting base for the servos.
Stall Speed: The speed at which air stops moving
fast enough over the surface of a wing to keep the
airplane flying.
Thermal: Simply put, a column of warm or hot air
that rises. Birds and glider pilots enjoy flying in
thermals. Airplanes like the Thermalaire EP are spe-
cifically designed to fly in thermals.
Transmitter: The part of the radio system that you
control. It transmits the control inputs to the receiver,
which transfers that information to the servos.
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