||When turning an airplane using only
ailerons, the drag of the lowered aileron is greater that that
of the raised aileron; this extra drag tend to yaw the
airplane in a direction that's the opposite of what the pilot
||Maneuvers that involve bank and
pitch angles in excess of 60 degrees.
||The dynamics of bodies relative to
gases - especially the interaction of solid objects
moving within the atmosphere.
||A hinged or movable portion of an
airplanes wing, at the trailing edge, primarily used to induce
||A part or surface, e.g., wing, prop
blade, aileron, or rudder that's designed (shape, orientation
etc.) to control the aircraft stability, direction, lift,
thrust or propulsion.
|AOA (angle of attack)
||The acute angle between the wing
chord line and the relative airflow.
||Any radio channel function other
than the four basic primary channels - aileron, rudder,
elevator and throttle.
||The part of the landing pattern
that's at 90 degrees to the final approach.
||Battery Eliminator Circuitry. This feature enables a speed
controller to operate a receiver from the same battery that the
motor uses. BEC saves weight, as it eliminates the receiver
||A solid, vertical piece of wood
inside a fuselage which helps to give it shape and rigidity.
||A charging rate of C is that which will in theory fully charge a
cell in 1 hour. It's actually the same number as the cell capacity
but expressed in mA not mAH. E.g. for a 2000 mAH cell the C rate
is 2000 mA i.e. 2A.
||Another name for a FERRITE MOTOR
||Usually battery or cell capacity. It is measured in Amp Hours
(AH) or more commonly milliAmp Hours (mAH). 1 AH = 1000 mAH = the
ability to deliver a CURRENT of 1 Amp for 1 Hour, or 10 Amps for 6
minutes (1/10th of an hour), or 30 Amps for 2 minutes etc. Note
that this is not related to voltage. It a characteristic of the
CELL type. To get greater VOLTAGE you add more CELLS.
|Center of gravity (CG)
||A model airplanes balance point.
||Device used to recharge Packs, usually from a 12V car/leisure
type battery. These come in a wide range of prices and
specifications. The main things to look for are the number of
cells they will charge and the maximum current they will deliver.
You will find a price jump from chargers which charge up to 7
cells and those over. That's because to charge more than 7 cells
from a 12V battery requires special circuitry to increase the
||To gain altitude after takeoff.
||This term is generally used for brushed (conventional) motors
with rare earth magnets. Some of these (Astro) actually use cobalt
as the brush material but there are other materials used.
Regardless of the precise material these are all commonly, if
inaccurately, called cobalt motors.
||Metal rods or plastic tubes that
connects servos to control horns. Carbon fiber rods are also
used in smaller models.
||A movable airfoil that can be
controlled by the pilot to change the aircraft's flight
||To point the model's nose into a
crosswind by using the rudder to move the model sideways and
prevent it from being blown off course.
||Wind blowing across the takeoff run
or a models flight path.
||Portion of the traffic pattern at
90 degrees to either the upwind or downwind legs; directly
opposite the base leg.
||A landing without power.
||A section of balsa or plywood added
to the inside of a fuselage to strengthen it.
||Air resistance that slows the
||A movable control surface -
usually on the horizontal stabilizer - that's used to control
a model's pitch attitude.
||Characteristic of a cell. It is basically a measurement of how
much CAPACITY you get for each unit weight. Since the cells are
usually a high percentage of our total weight the higher this is
the better. If you could get a 2000 mAH cell that weighs only half
the conventional ones you would save a lot of weigh from the
||Electronic Speed Control. This device is the equivalent of a
throttle for electric motors. It controls the power into the
motor. Many ESC's are also fitted with other facilities like BEC
(see above), a brake (to stop the motor wind milling and allow
folding propellers to close properly)
||Brushed (conventional) type of motor with low cost ferric oxide
||The portion of the landing pattern
which starts from the 90 degree turn from the base leg and is
followed by the landing.
||A slow, smooth transition from
normal approach attitude to a landing attitude.
||Folding propeller. When the motor is not running the prop blades
fold alongside the fuselage for lower drag (and you don't break so
many blades on landing). Typically used with powered gliders.
||A hi-rate speed control switches at a high frequency, usually at
around 2 to 3000 times per second.
||IC stands for "internal combustion." I use this term
to refer to all the various kinds of fuel-driven engines: gas,
diesel, glow, etc... (i.e. the "normal" R/C power
||This is the main characteristic of a CELL which limits the
maximum current you can get out of it. So far NiCds have by far
the lowest internal impedance available.
||A lo-rate speed control switches at the same frequency as the
servo signal. Roughly 50 times per second.
||Indicates that the electrical current for the power system is
isolated, which makes motor-induced radio interference less
likely. The design of opto-coupling makes it impossible to
incorporate with BEC.
||Some electronic switches will ramp the current up over a small
time (often less than a second) when you switch on. This greatly
helps to reduce wear and tear on motors and particularly
gearboxes. Some ESCs also claim this feature though it only really
does anything if you slam the throttle wide open from zero.