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RCUniverse Glossary





Total Words: 412
Words Found in Search: 28
Viewing Records: 1 - 28
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WordDefinition
A arm
front and rear suspension arms of independent suspension r/c cars and trucks. Shaped like an A where the shocks mount in the middle, hub ar the point, and mounts to the car at the opening


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Added by: chadchm8
ABC
Engine construction that consists of an aluminum piston, & a brass cylinder that has been chrome plated. Very commonly used today on higher perfomance engines.


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See also: ABN Added by: fritzke
ABN
Engine construction that consists of an aluminum piston, & a brass cylinder that has been nickel plated. Sometimes used today on higher perfomance engines.


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See also: ABC Added by: John Wells
Ackerman Angle
A) Named after Rudolf Ackerman, this angle defines the correct angle that steering wheels must have to effeciently negotiate a turn. In a standard turn, the wheel on the inside of the turning radius must follow a more severely curved line than the outside wheel. By setting steering arms, one can successfully adjust the turning angle so that the inside tire turns at a larger angle than the outside. This results in better traction around the turn.

B) Ackerman angle is the angle of the king post which holds the hub, the angle is the verical displacement of the top of the king post rearwards, the inside turning wheel will effectivly move in a smaller radius than the outside wheel, this angle also helps in the self centering of the steering in a straight line.


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See also: Differential Added by: mkranitz
Adjacent channel rejection
The ability of a reciever to filter out frequencies, above or below, its normal crystal operating frequency.


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Added by: w8ye
Adverse Yaw
It is the down aileron that causes greater drag and pulls the plane in the opposite direction one would expect ie left stick rt aileron down and nose to the rt unless rudder is properly applied. A cub is a good example of this characteristic.

To correct for this many computer radios will allow you to program in differential to give more up than down aileron.


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See also: Aileron | Differential Throw Added by: mkranitz
AFR
Adjustable Function Rate, term used by Futaba, especially with the 9Z radio system


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Added by: Hughes500Pilot
Aileron
Hinged control surface located at the trailing edge of each wing, that provides control of the airplane about the roll axis. Ailerons move in opposite directions in order to provide lift on one wing and the opposite force on the other, in the process "rolling" the aircraft in the direction of the wing with the raised aileron.


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See also: Differential Throw | Adverse Yaw | Roll Axis Added by: Lightfoot
Airfoil
A part or surface, such as a wing, propeller blade, rotor blade or rudder, whose shape and orientation control stability, direction, lift, thrust, or propulsion.


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See also: Rib (wing) Added by: mkranitz
Airplane Hardware
Materials used in finishing an aircraft, such as torque rods, hinge material, landing gear, surface control horns, and engine mounting etc.


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Added by: larrypaul
alt
altitude


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Added by: Raad
AMA
Academy of Model Aeronautics - the largest governing body in America for model aviation. http://www.modelaircraft.org


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Added by: Mr.Extra 260
Amp Hour
The electric charge transferred past a specified circuit point by a current of one ampere in one hour.


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Added by: Mick@Nite
Angle of Attack
The angle measured between the chord line of an airfoil (wing or rotor) and the relative wind (RW) of airflow over the airfoil. (For rotor blades, rotational relative wind (RRW) is used.)


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See also: AOA | Harrier | Stall | Washout Added by: mkranitz
Angle of Incidence
the angle between the wing's chord and the longitudinal axis of an aircraft (a fixed value). The wings are typically mounted at a small positive angle of incidence, to allow the fuselage to be "flat" to the airflow in normal cruising flight.


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Added by: aircowboy
Anhedral
The opposite of dihedral, anhedral is the downward angle of wings when viewd from the front of the airplane. Anhedral makes the aircraft less stable but more maneuverable.


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See also: Dihedral Added by: mkranitz
anodize
To coat (a metallic surface) electrolytically with a protective or decorative oxide.


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Added by: billybriggs
AOA
See, Angle of Attack


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See also: Harrier | Angle of Attack Added by: JWN
ARC
"Almost Ready to Cover" An ARF airplane that is not covered which allows you to chose your own covering scheme


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See also: ARF Added by: bubbagates
ARF
"Almost Ready to Fly" - ARF aircraft are virtually complete in the box. A typical ARF takes between 12-20 hours to complete.


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See also: RTF | ARC Added by: mkranitz
armature
The central part of an electric motor, usally carrying the windings and the commutators. The load propellor, pinion gear) is usually attached to the armature shaft.


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Added by: fritzke
ARR
"Almost Ready to Run" - These cars typically require a minor amount of assembly to get them rolling. Most modelers can handle the assembly process on today's ARR cars and trucks.


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See also: RTR Added by: mkranitz
Aspect Ratio
Applicable to any physical object (e.g. tires, airplane wings, rotor blades, etc.), the aspect ratio refers to the relationship between the height and width of the object. The ratio is equal to the height divided by the width (on a wing it is the chord divided by the span). So, a wing that has a chord of 10 inches and a span (one side of the wing only) of 40 inches has a .25 or 25% apect ratio.

span/chord, so the example would be AR=40/10=4 and Aspect ratio is not reported in %. Per the definition in Theory of Wing Sections by Abbott and Von Doenhoff: "Aspect ratio is defined as the ratio of the span squared to the wing area (b^2/S), which reduces to the ratio of the span to the chord in the case of a rectangular wing" Page 6 para 1.3


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Added by: mkranitz
ATV or EPA
Adjustable Travel Volume or End Point Adjustment features on more expensive radio transmitters control the maximum travel of the servo on both sides of neutral position.


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Added by: mkranitz
Aunt Jemima
A pullout that ends too low, resulting in the plane pancaking. The magnitude of the damage determines whether it is a short stack or a tall stack.


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See also: Stonewall | Smackdown Added by: marcv
Autogyro
An aircraft powered by a conventional propeller and supported in flight by a freewheeling, horizontal rotor that provides lift.


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Added by: felix.ragav
Autorotation
When a helicopter loses power mid-flight, a pilot may nevertheless land the craft safely by causing the rotor blades to spin freely in the wind. By changing the pitch of the rotor blades to a negative angle, wind rushing through the rotor system as the helicopter descends will cause the rotors to speed up. As the helicopter approaches the ground, the pilot "feeds in" positive pitch gradually to create lift and slow the descent. Positive pitch drains the rotational energy stored in the rotor system so a pilot has only ONE chance to successfully perform an autorotation maneuver.


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See also: Dead Stick Added by: mkranitz
AUW
All Up Weight - The total weight of the project. This includes everything needed to make it run or fly. Receiver, servos, batteries, ect. The all up weight of the project.


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Added by: ntjp2005
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