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RCUniverse Glossary





Total Words: 412
Words Found in Search: 412
Viewing Records: 1 - 30
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WordDefinition
1/2 A
A glow engine size class with cylinder displacement of .050 cubic inches and less.


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Added by: fritzke
2 stroke
“2 Stroke” is short for “two-stroke cycle,” which refers to a type of engine used on model airplanes, leaf blowers and other machines. The two strokes are the downward and upward motions of the piston inside the cylinder. The downward stroke causes pressure in the crankcase, which forces fuel/air mixture up a passage to an opening in the cylinder, where it also assists the spent fuel to exit the exhaust opening. The upward stroke causes the piston to cover the exhaust and bypass openings, and pressure is reduced in the crankcase. This causes a new charge of fuel/air mixture to be drawn in through the carburetor, while pressure is increased in the cylinder until the compressed fuel/air mixture is ignited by the glow plug. Pressure from the burning fuel then drives the piston downward to begin the next cycle. Note that two-stroke engines “fire” each time the piston reaches the top. (See 4 Stroke)


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See also: 4 Stroke Added by: twostroke
2/3 AA
A type of battery found in many park flyers and also in some 1/18th scale buggies/trucks. The cells are about 2.8cm length and 1.8 wide

They range from 300mah to 1400mah and voltages of 7.2 volt to 10.8 volt


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Added by: E-SKY_FLYER
27 MHz
A frequency reserved for general commercial use. Often used in toys and other consumer electronics that transmit data wirelessly. Because of this, it is easier to get interference with your radio system while using this band. Often toy grade r/c equipment using this band will not mark which channel it is operating on, making it harder to use multiple toys at the same time.


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Added by: pace_likethesalsa
3D
Flying beyond the stall!!!

Example Maneuvers: Prop Hang Torque Roll Harrier (inverted, upright, rolling and other combos) Elevator (as above) Blender Waterfall and more...


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See also: Harrier | Torque Roll Added by: Ian.W
4 Stroke
“4 Stroke” is short for “four-stroke cycle,” which refers to a type of engine used on model airplanes, automobiles and other machines. The four strokes are two downward and two upward motions of the piston(s) inside the cylinder(s). The first (downward) stroke is called “intake,” which reduces pressure in the cylinder. With the intake valve open, this draws fuel/air mixture into the cylinder from the carburetor. The second (upward) stroke is called “compression,” and with both valves closed the fuel/air mixture is compressed until it is ignited by a glow plug or spark plug. The third (downward) stroke is called “power,” where the pressure from the burning fuel drives the piston downward. The fourth (upward) stroke is called “exhaust,” and with the exhaust valve open the piston forces the spent fuel out the exhaust pipe. Note that four-stroke engines “fire” every-other time the piston reaches the top. (See 2 Stroke)


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See also: 2 stroke Added by: Ralph Morris
4 Wheel Drive
4 Wheel Drive is when all four wheels are powered by the engine/motor through a drivetrain. The use of four wheel drive allows a buggy, monster truck or car to obtain better traction.


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Added by: Ryan_rammstien
4-link
a form of truck suspension that houses a straight axle mounted by 4 links to the truck and a shock to the top. Used in rock crawling or accuracy in building a custom truck.


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Added by: chadchm8
4D
Power system capable of reverse thrust.


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Added by: mrblucor
50-Grit Pass
A knife edge or inverted pass low enough to leave some monokote, balsa and foam on an asphalt runway. On a grass runway this is also known as a 'Cartwheel'.


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See also: Yard sale Added by: marcv
72 Mhz
FM Frequency band reserved for general air vehicles (planes, helicopters, etc.). Often used in remote control vehicles with dedicated receiver and transmitter with interchangeable crystals. Channels 11-60 are available channels in this band.


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Added by: Primodus
75 MHz
FM Frequency band reserved for general ground vehicles (cars, boats etc.). Often used in remote control vehicles with dedicated receiver and transmitter with interchangeable crystals. Channels 61-90 are available channels in this band.


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See also: TX Added by: heavyaslead
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
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RCU4 | 54.82.231.87 | 0 | 1 | 05:23:48 PM EST | NC