Great Planes PT-60 Kit - GPMA0119 - Manual (Page 46)

Flutter -A phenomenon whereby the elevator rudder, or
aileron control surface begins to oscillate violently in flight
This can sometimes cause the surface to break away from
the aircraft and cause a crash There are many reasons for
this, but the most common are excessive hinge gap or
excessive "slop' in the pushrod connections and control
horns If you ever hear a low-pitched buzzing sound,
reduce throttle and land immediately.
Frequency Control -The FCC has allowed the 72MHz
band to be used for R/C aircraft operations This band is
divided up into many different channels in which you can
choose a radio system You should be aware that certain
areas have frequencies in w h i c h there is pager
interference This is why it is always a wise move to check
with your local hobby shop to find out any channels that
may be troublesome in the area you wish to fly.
Fuel Overflow Line (Vent) -The fuel line is either open to
atmospheric pressure or attaches to the muffler pressure
nipple to pressurize the fuel tank for better fuel flow to the
engine This is the line through which the fuel will overflow
when the tank is full.
Fuel Pick-Up Line -The fuel line in the fuel tank through
which fuel travels to the carburetor Typically a flexible tube
with a weight or Clunk on the end which allows it to follow
the fuel with changes in aircraft attitude This is the line
through which the tank is filled.
Fuselage -The body of an airplane.
Glitch -radio problem that never happens unless you are
over trees or a swamp
Glow Plug -The heat source for igniting the fuel/air mixture
in the engine When starting the engine a battery is used to
heat the filament After the engine is running, the battery
can be removed The wire filament inside the plug is kept
hot by the "explosions" in the engine's cylinder See next
heading and Idle Bar" plug.
Glow Plug Clip/Battery -A 1 2-volt battery, which is
connected to the glow plug on a model airplane engine for
starting. The battery is removed once the engine is
running steadily.
Grease-in -A very smooth, gentle landing without a hint of
a bounce.
Hit (or to be hit) -Sudden radio interference which causes
your model to fly in an erratic manner Most often caused
by someone turning on a radio that is on your frequency,
but can be caused by other radio sources miles away
Horizontal Stabilizer -The horizontal tail surface at the
back of the fuselage which provides aerodynamic pitch
stability to the airplane
Idle Bar plug -This type of glow plug has a "bar" across
the tip to help prevent raw fuel from being splashed onto
the glow element Too much raw fuel will cool the plug and
prevent it from igniting the fuel/air mixture An idle bar is a
help in obtaining a low idle speed.
Lateral Balance -The left-right or side to-side balance of
an airplane An airplane that is laterally balanced will track
better through loops and other maneuvers
Leading Edge (LE) -The very front edge of the wing or
stabilizer This is the edge that hits the air first.
Muffler -A device attached to the exhaust stack of the
engine to reduce noise and increase back pressure which
helps low speed performance Note Most R/C Clubs
require the use of mufflers
Muffler Baffle -A restnctor plate inside the muffler which
reduces engine noise. This plate can be removed to
increase power, but only if there are no noise restrictions
where you fly.
Needle Valve -Adjustment on a carburetor used to set
proper fuel/air mixture Some carburetors have separate
needle adjustments for low and high throttle Typically,
turning the needle clockwise (screwing in) leans the mixture
(less f u e l ) , and vice versa However there are a few
exceptions—refer to the engine manufacturer's instructions.
NiCd -Nickel Cadmium battery Rechargeable batteries
which are typically used as power for radio transmitters
and receivers
Nitro -Nitromethane, a fuel additive which increases a
model engines ability to idle low and improves high speed
performance Ideal nitro content varies from engine to
engine Refer to the engine manufacturers instructions for
best results Nitro content in fuel is indicated by the percent
of the fuel.
Ni-starter -A self-contained battery and glow plug clip,
used when starting the engine.
See glow/plug clip "
One-point landing (or a figure 9) -Synonymous with
"stuffing it in Something we hope you never do.
Pitch Axis -The airplane axis controlled by the elevator.
Pitch is illustrated by holding the airplane at each wingtip
Raising or lowering the nose is the pitch movement This is
how the climb or dive is controlled
Power panel -12-volt distribution panel that provides
correct voltage for accessories like glow-plug clips, fuel
pumps and electric starters Usually mounted on a field box
and connected to a 12-volt battery
Prop pitch -Props are designated by two numbers, for
instance 10 - 6 The first number is the props length, 10".
The second number is the pitch or angle of the blades The
6 represents the distance the propeller will move forward in
one revolution, in this case 6".
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