Charge Jack

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.

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CG (Center of Gravity)

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.

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Carburetor

The part of the engine which controls the speed or throttle setting and lean/rich mixture via setting of the needle valve.

Wiki:

A carburetor (American and Canadian spelling), carburator, carburettor, or carburetter (Commonwealth spelling) is a device that blends air and fuel for an internal combustion engine. It is sometimes, but not always, shortened to carb in North America and the United Kingdom.

Slide Carburetors

A slide carburetor has a throttle valve that slides out the side. This reduces air restriction, for better performance, and requires the servo to move less to open it fully, for better throttle response. They also require a more precise alignment of the carburetor and throttle servo to prevent binding, which can result in dangerous stuck throttle conditions, which can often only be resolved by killing the engine after the vehicle is stopped by a large immobile object like a tree. Slide carbs are used on all big block nitro engines, and on many small block nitro engines. They are fairly prone to sticking because of dirt, and on land vehicles, an air filter is always used.

Rotary Carburetors

Rotary carburetors have a barrel with a hole in it that rotates. This takes more servo movement to completely open, and reduces throttle resopnse. They also have more restriction, which can reduce overall power. Some people feel that these are better for offroad use, because they have more throttle range. They aren't used on big block engines. They are as prone to dirt as a slide carb.

Butterfly Carburetors

Butterfly carburetors are common on gasoline RC engines and small 2 stroke engines designed for other purposes but used on RCs. They have a butterfly, or a thin piece of metal that rotates to open the throttle. They don't stick when they get dirty, but the dirt can still cause engine damage and poor performance. These carburetors are also used in alot of full scale applications, like cars and lawnmowers. They often have a second butterfly as a choke valve, to reduce air flow, temporarily richening the mixture for easier starting. These carburetors have more restriction then other carburetors, but the engines they are used on are larger, and the performance doesn't matter as much.

Nitro Rc Engine Diagram

• Cylinder Head
• Glow Plug
• Pullstart
• Combustion Chamber
• Piston
• Exhaust port
• Carburetor
• Mixture needle
• Idle screw
• Throttle linkage
• Crankcase
• Crankshaft

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Buddy Box

Buddy Box Meaning:
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.

Training method utilizing two transmitter control boxes, linked together. The trainer radio has override control, which the instructor uses to take control when the trainee looses control, or becomes disoriented.

Wiki:

Buddy box or buddy boxing is a colloquialism referring to two R/C aircraft radio systems joined together for pilot training purposes.

This training system is universal among the five major R/C radio manufacturers (Futaba, JR, Hitec, Airtronics and KO Propo) which means that transmitters do not have to be the same brand in order to be joined via an umbilical cable. There are, however, two different types of DIN cable connectors used for the purpose and the two are incompatible. Therefore, both transmitters must have the same type of receptacle in order to operate together.

Buddy boxing is accomplished by joining the student and master transmitters via the aforementioned cable and making sure that the servo reversing switches and trims are set identical on both. The student is given control of the aircraft via a long-handled, spring-loaded switch on the top left corner of most transmitters located on the master transmitter, normally held by the instructor. When the switch is pulled forward and held on by the instructor's left index finger, control of the aircraft is at the student's transmitter. Should the instructor judge that the student is encountering difficulty in flight, control is transferred to the master transmitter merely by releasing the switch. (On some older Futaba radios such as the popular 6XA, the trainer switch is actually a push-button located in the corner, the aforementioned corner toggle switch is reserved for channel 5 - landing gear.)

The two transmitters need not be on the same frequency. The master transmitter is the one that actually flies the plane; buddy boxing turns the student transmitter into a "dummy" remote control of the master. The student transmitter is operated with power switched off as power for both is provided by the master. The student transmitter will power up via the umbilical despite being switched off.

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BEC - Battery Eliminator Circuitry

A circuit that eliminates the need for a receiver battery, usually in electric R/C cars and boats.

Wiki:
A battery eliminator circuit (BEC) is an electronic circuit designed to deliver electrical power to other circuitry without the need for a battery. Historically the expression was sometimes used to describe devices used to power battery-driven equipment from mains electricity. This is still the case in many products offered in retail electronic supply stores.

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CA - Cyanoacrylate

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.

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Boring Holes in the Sky

Boring Holes in the Sky : Having fun flying an RC airplane, without any predetermined flight pattern.

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2.4GHz Band

a.k.a. Spread Spectrum. The newest radio band available for R/C use. Operates at higher frequencies than noise. See also: FHSS and DMSS.

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ARR (Almost Ready to Run)

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.

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BB Crankshaft

BB:These letters usually designate a ball-bearing supported crankshaft in an R/C engine. This makes the engine run smoother and last longer.

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Adjustable Travel Volume (ATV)

ATV allows you to preset the maximum travel of a servo to either side from its neutral position. Such settings help tailor control action to suit your flying or driving style.

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ABC / Non-Ringed

These letters stand for aluminum, brass and chrome or a composite such as nickel. These engines have an aluminum piston and a chrome or composite coated brass cylinder sleeve which allows them to be more efficient for higher performance. They have no piston ring and rely on a very tight piston/cylinder fit to obtain a piston/cylinder seal. New ABC engines are normally hard to turn over by hand. Because of the tight fit, it is very important that the engine is broken in properly.

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2 Wheel-Drive vs. 4 Wheel Drive

As in full-scale cars, there are two main drive types: two-wheel drive (2WD) where power is supplied to the two rear wheels, and four-wheel drive (4WD) where power is supplied to all four wheels. The 2WD vehicles are less expensive and require less overall assembly and maintenance than 4WD vehicles. Assembly and maintenance for 4WD vehicles tends to be more involved, though not necessarily more difficult; the trade-off is that 4WD vehicles offer better steering through turns.

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Differential Throw

Ailerons that are set up to deflect more in the upward direction than downward are said to have Differential Throw. The purpose is to counteract Adverse Yaw.

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Adverse Yaw

The tendency of an airplane to yaw in the opposite direction of the roll. For instance, when right aileron is applied, the airplane yaws to the left, thus opposing the turn. Adverse yaw is common in trainer type airplanes having flat bottom wings. It is most noticeable at slow speeds and high angles of attack, such as during takeoffs and when stretching a landing approach. Caused by the unequal drag of the upward and downward deflection of the ailerons, this undesirable trait can be minimized by setting up the ailerons with Differential Throw or by coordinating the turns, using the aileron and rudder controls simultaneously. (See Differential Throw.)

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