Dynaflite PT-19 - Manual (Page 30)

Here is a short list of terms and definitions so you'll
know what they're talking about at the flying field.
Ailerons -Hinged control surfaces located on the
trailing edge of the wing, one on each side, which
provide control of the airplane about the roll axis.
The control direction is often confusing to first time
modelers. For a right 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.
Angle of attack -The angle that the wing penetrates
the air. As the angle of attack increases so does lift
and drag, up to a point.
ARF -A prefabricated model - Almost Ready to Fly.
Buddy Box -Two similar transmitters that are wired
together with a "trainer cord." This is most useful
when learning to fly—it's the same as having dual
controls. The instructor can take control by using the
"trainer switch" on his transmitter.
CA -Abbreviation for "Cyanoacrylate." An instant
type glue that is available in various viscosities (Thin,
Medium, Thick, and Gel). These glues are ideal for
the assembly of wood airplanes and other materials.
NOTE: Most CA glues will attack styrofoam.
Carburetor -The part of the engine which controls
the speed or throttle setting and lean/rich mixture
via setting of the needle valve.
CG -"Center of Gravity"- For modeling purposes, this
is usually considered the point at which the airplane
balances fore to aft. This point is critical in regards to
how the airplane reacts in the air. A tail-heavy plane
will be very snappy but generally very unstable and
susceptible to more frequent stalls. If the airplane is
nose heavy, it will tend to track better and be less
sensitive to control inputs, but will generally drop its
nose when the throttle is reduced to idle. This makes
the plane more difficult to land since it takes more
effort to hold the nose up. A nose heavy airplane will
have to come in faster to land safely.
Charge Jack -The plug receptacle of the switch
harness into which the charger is plugged to charge
the airborne battery. An expanded scale voltmeter
(ESV) can also be plugged into it to check battery
voltage between flights. It is advisable to mount the
charge jack in an accessible area of the fuselage so
an ESV can be used without removing the wing.
Charger -Device used to recharge batteries and
usually supplied with the radio if NiCd batteries
are included.
Chicken Stick -A hand-held stick used to flip start a
model airplane engine.
Clunk -A weighted fuel pick-up used in a fuel tank
to assure the intake line is always in fuel.
Dead Stick -A term used to describe unpowered
flight (glide) when the engine quits running.
Dihedral -The V-shaped bend in the wing. Typically,
more dihedral causes more aerodynamic stability in
an airplane, and causes the rudder to control both
the roll and yaw axis. This is why some trainers and
sailplanes require only 3 channels of radio control.
Ding -Minor dent or damage to the structure. Also,
a nick in a prop. Dinged props must be replaced.
Down thrust -Downward angle of the engine
relative to the centerline of the airplane. Down thrust
helps overcome the normal climbing tendency of flat
bottom wings.
Electric Starter -A hand-held electric motor used for
starting a model airplane engine. Usually powered
by a 12-volt battery.
Elevator -Hinged control surface located at the
trailing edge of the horizontal stabilizer, which
provides control of the airplane about the pitch axis
and causes the airplane to climb or dive. The correct
direction of control is to pull the transmitter elevator
control stick back, toward the bottom of the
transmitter, to move the elevator upward, which
causes the airplane to climb, and vice versa to dive.
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