Dynaflite DYFA3901 - Manual (Page 6)

High-Start: A device used to launch a model glider
like a slingshot. This device consists of a stake, an
elastic tube/ monofilament line (or string), a
parachute or streamer and a ring for attaching the
high-start to the glider.
Laminate: The process of gluing a multiple number
of sheets face-to-face to increase strength.
Horizontal Stabilizer: The non-moving horizontal
tail surface at the back of the fuselage which
provides aerodynamic pitch stability.
Pitch Axis: The sailplane axis controlled by the
elevator. Pitch is illustrated by holding the sailplane
at each wing tip. Raising or lowering the nose is the
pitch movement.
Pushrod: A rigid piece of steel, plastic or wood used
to transfer movement from a servo to a control surface.
Receiver (RX): The radio unit in the sailplane which
receives the transmitter signal and relays the control
to the servos. This is somewhat similar to the radio
you may have in your family automobile, except the
radio in the glider perceives commands from the
transmitter and the radio in your car perceives
music from the radio station.
Rudder: Hinged control surface located at the
trailing edge of the vertical stabilizer, which
provides control of the sailplane about the yaw axis
and causes the sailplane to yaw left or right. Left
rudder movement causes the sailplane to yaw left
and right rudder movement causes it to yaw right.
Sailplane: An airplane which flies without an
engine. Sailplanes are designed to ride on warm,
rising air currents, called thermals. Sailplanes are
launched by several methods: a giant sling shot
called a high-start; a winch which pulls the sailplane
up like a kite; or with the assistance of a small
engine or electric motor.
Servo: The electronic/mechanical device which
moves the control s u r f a c e s of the sailplane
according to the commands from the receiver. The
radio device which does the physical work inside
the sailplane.
Servo arm: The removable arm or wheel which
bolts to the output shaft of a servo and connects to
the push rod.
Tow Hook: A device used to connect the tow line to
the sailplane during launch.
(Transmitter: The hand-held radio controller. This is
the unit that sends out the commands that you input.
Vertical stabilizer: The non-moving surface that is
perpendicular to the horizontal stabilizer, often
referred to as the fin, providing lateral stability. The
rudder attaches to this surface.
Wing: The main lifting surface of an airplane.
Yaw Axis: The glider axis controlled by the rudder.
Yaw is illustrated by hanging the glider level by a
wire located at the center of gravity. Left or right
movement of the nose is the yaw movement. Many
gliders are not equipped with ailerons and the roll
and yaw axis are controlled by the rudder. This is
due to the larger amount of dihedral in the wing and
is why most sailplanes have a large amount of dihedral.
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