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.
ARR –Some cars and trucks are available virtually prebuilt and will be indicated by the terms ARR (Almost-Ready-To-Run) or RTR (Ready-To-Run). The ARR/RTR vehicles cost a little more, but if you’re just not interested in building your car, this is an option for you. Most vehicles, however, come in kit form and require you to do the building. This may require a few evenings, but the familiarity you gain from assembly will make repairs, adjustments and modifications easier to make down the road.
Battery Eliminator Circuitry (BEC) –A circuit that eliminates the need for a receiver battery, usually in electric R/C cars and boats.
BB –These letters usually designate a ball-bearing supported crankshaft in an R/C engine. This makes the engine run smoother and last longer.
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.
Boring Holes in the Sky –Having fun flying an R/C airplane, without any predetermined flight pattern.
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, usually supplied with the radio if NiCd batteries are included.
Chicken Stick –A hand-held stick used to “flip start” a model airplane engine.