31
GLOSSARY OF TERMS
Adjustable Connector: Connects to the servo arm.
The pushrod wire passes through the connector and
is held in place with a set screw. The screw can be
loosened to allow the pushrod wire to be adjusted to
the correct length.
C/A Glue: An acronym for Cyanoacrylate. It dries
very fast like "Super Glue". It comes in many differ-
ent formulas for different uses.
Center of Gravity: Most commonly referred to as
the CG or balance point, it is the point at which the
airplane is in complete balance in all three axis.
Clevis: Part of the control system, either made out of
nylon or metal. It connects the pushrod wire to the
control horn mounted on the control surface.
Clevis Attachment Holes: The molded holes in the
control horn. The clevis attaches to these holes.
Control Horn: Part of the control system, the con-
trol horn is mounted to the control surface. It allows
the pushrod to be connected to the control surface.
Most all control horns are adjustable to allow for more
or less control surface movement.
Covering: Material made out of vinyl or polyester.
Covering has heat sensitive adhesive that when heated,
sticks to the wood frame of the airplane. The
Airmaster II uses heat sensitive polyester covering.
Dihedral: The upward angle of each wing half. Di-
hedral creates more stability that makes learning to
fly much easier.
Dihedral Brace: Made out of plywood, the dihedral
brace strengthens the joint between two wing sections.
Elevator: The elevator is the control surface on the
back of the airplane that moves up and down. This
surface controls pitch.
Epoxy: A two part glue containing a resin and a hard-
ener. 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.
Hinges: Usually made out of plastic, the hinges con-
nect 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.
Pushrods: Connect between the control surface and
the servo. Transfers the movement of the servo 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.
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 to function.
Servo Arm: Connects to the servo, the servo arm
allows the pushrod to connect to the servo.
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.
Threaded Pushrod: A length of wire that has threads
cut into one end of it. See Pushrods.
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.
Trim Tab: A sliding tab on the transmitter that al-
lows you make small adjustments to the control
surfaces from the transmitter.
