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RCUniverse Glossary





Total Words: 412
Words Found in Search: 27
Viewing Records: 1 - 27
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WordDefinition
P-Factor
Yawing affect caused by the angle of attack of the descending prop blade being greater than that of the ascending blade. Proper way to over come this is with rudder. It is most notable when you are at high angle of attack, low airspeed and high power settings.


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Added by: jlingrel
Pattern Flying
Precision RC aerobatics.


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See also: Box Added by: grotto2
PCM
"Pulse Code Modulation" - PCM stands for Pulse Code Modulation. PCM in R/C is actually no closer to an accurate description than PPM! PCM is another encoding scheme, not a modulation scheme. By 1981, before PCM was introduced, we modelers were permitted to use Frequency Modulation as well as AM. The FM R/C system actually uses FM/FSK where FSK stands for Frequency Shift Keying. FM/FSK is also used for PPM encoding. This simply means that, for each modulation pulse, the frequency of the transmitted signal is shifted about 3KHz; from 1.5 KHz above to 1.5 KHz below the center frequency. The other variant is that some manufacturers shift from low-to-high vs. high-to-low just to be different from the competition. True PCM in the normal communications lexicon means that an analog signal is sampled periodically and its amplitude is converted to a digital word of a certain length; i.e., the greater the amplitude, the higher the digital number. Several channels can be multiplexed and merged with a ”start bit” and “end bit” to describe the start and end of a message segment. There is considerable controversy as to whether PCM as an encoding scheme offers any unique advantage.

(this definition comes courtesy of FMA Direct)


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See also: Glitch | PPM Added by: mkranitz
Peak Battery Charger
A peak charger automatically ceases charging when your battery is fully charged.


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Added by: mkranitz
Pinion Gear
A gear that fits over the drive shaft of a motor. By adjusting the number of "teeth" in the pinion gear, you can increase the torque or overall drive speed of the output device (be it a propeller or wheels). An increase in torque will result in a decrease in speed and visa versa.


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Added by: mkranitz
Piro Flip Maneuver
While performing a "Flip" maneuver, the pilot piroettes the helicopter.


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See also: Flip Maneuver Added by: mkranitz
Pitch
Refers to the angle between an imaginary horizontal line parallel to the fuselage of a helicotper and the chord line of the rotor blade (the line that traverses the width of the rotor blade (when the blade is viewed from it's edge) from trailing edge to leading edge. The higher the pitch (up to a certain point), the more lift from the rotor system.


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Added by: Shortymet55
Pitch Axis
The axis of an aircraft about which the aircraft rotates to change its angle of attack. The pitch axis can be imagined by thrusting an imaginary rod through an airplane wing from one wingtip to the other. Rotation about the rod is pitch.


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See also: Cyclic | Horizontal Stabilizer | Elevator Added by: mkranitz
Plane
When a boat reaches enough speed to climb out of its bow wave and plane on top of the water's surface. Also called "get up on plane" or "plane out".


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See also: Hull Added by: dauntlessfan
Planking
The outer surface of a built-up structure. Ususally sheets or strips of wood applied to the internal framework to form a smooth surface.


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Added by: fritzke
Polyhedral
When viewed from the front (leading edge), a wing with polyhedral has three distinct points at which its surface is angled upward relative to an imaginary horizontal line which the leading edge would follow if the wing were perfectly flat from tip to tip. The two wing halves form the first angle which occurs in the center of the wing (if we stopped here, the wing would have dihedral. At equidistant points from the center of the wing (and typically closer to each wing tip than the center) on each wing half, there is another "break point" where the wing angles up again, making the wing tips higher, when measured from the imaginary horizontal line.


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See also: Dihedral Added by: Bob Laine
Port
The left side of a boat, looking forward


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Added by: azcaptain
Port Timing
Measured in crank shaft degrees from TDC. Port timing represents the initial opening to fully opened degrees of intake/exhaust ports of a 2 stroke engine. Port timing can be modified to augment a 2 stroke's power and rpm range.


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Added by: Mike SVOR
Powered-up
The maximum fail-safe free distance measured during a range check when every RFI/EMI (Radio Frequency Interference) / (Electro Magnetic Interference) producing device in the aircraft is operating. Examples include: Turbine engines and all of their peripheral operating equipment, Gas engines and their ignition systems, Smoke pumps, lighting devices, virtually RFI/EMI device that will be operating during flight


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Added by: Silver182
PPM
"Pulse Position Modulation" - PPM stands for Pulse Position Modulation and is a term describing the concept for encoding using the scheme that came into being in the early 1960’s. The concept is the encoding scheme itself; not to be confused with modulation. The only form of modulation permitted for R/C systems in those days was Amplitude Modulation (AM). PPM in communications is based on taking a signal (Voice, music, et al) and operating on the continuously variable analog signal at sampling intervals with a voltage-to-pulse generator. The higher the amplitude of the signal, the closer the pulses are together and the higher the frequency of that variation, the faster the variations in pulse position occur. At the receiving end, whether by wire or radio, you can pass the pulse train through an integrator and reconstitute the original analog wave. The R/C decoder, instead, sorts out the variation from one pulse to the next in a very specific frame of pulses. It then converts a serial stream of data pulses into parallel servo output control pulses to drive the individual servos connected. The specifications of these pulses that have come to be pretty well standardized at 1.5 ms with the control position carried in continuous variation of the decoded pulse width by + and - 0.5 ms, maximum.

(this definition comes courtesy of FMA Direct)


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See also: Glitch | PCM Added by: mkranitz
Prang
Old British word for a crash.


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Added by: N11634
Pre-Ignition
A potentially engine-damaging condition in which part of the fuel/air mixture ignites before the piston is at top dead center (TDC). Pre-ignition is a result of poor ignition timing and can be heard as 'engine knock'. In nitro engines, the proper combination of glow plug and nitro content will prevent pre-ignition.


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Added by: Philster
Precession
The motion of the axis of a spinning body when there is an external force acting on the axis


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Added by: TexasAirBoss
Priming
Manually causing fuel to move from the fuel tank up to the carburetor. This is sometimes necessary after the engine has been sitting for a long period of time and all of the fuel has drained back to the tank.


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Added by: 3WideRacing
Prop Wash
Actual mass of airflow created by a rotating propeller. This is the current of air usually felt behind a running propeller. In highly aerobatic flying (e.g. 3D flying) the thrust created by the prop wash is strong enough to hover the aircraft.


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Added by: FalconWings
pucker factor
A WW II bomber crew experimented with a duck to watch his rear end pucker when the plane was close to touch down the closer to the ground the bigger the pucker, by using a peice of plexiglass with a gauge drawn on it they could measure the pucker and tell the distance to touch down when landing at night or low visibility. In rc terms its a way to measure a flight performance ie a very nice flight with no problems and greased in landing would be a pucker factor 1 or a very shaky flight with a new plane out of trim might be a higher pucker factor 10.


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Added by: SUKHOIDRIVER
Pull Start
A rope and handle to start an engine. Quick and short pulls are recommended.


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Added by: Skullbasher
Pull-Pull
A type of control surface connection which provides movement by tensioning cables on either side of the control surface rather than using a pushrod connected to one side of the control surface.


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See also: Pushrod Added by: grotto2
Pulse Proportional
A type of single channel system capable of providing simple proportional control by pulsing a tone that modulates the RF carrier. The pulse rate was quite slow and control surfaces visibly wagged, but aircraft seldom respond this wagging. Proportional rudder control was typically achieved by changing the tone on/off ratio or pulse width. Proportional elevator control was usually achieved by pulse rate changes. Full on or off tone could be made to move a throttle control in a given direction while rudder and elevator controls cycled about neutral. Also called Galloping Ghost.


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See also: Single Channel Added by: grotto2
Punch
a) As in "punch one in". The act of you crashing your airplane or 'punching' it into the ground.

b) Slang term for rapid acceleration


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Added by: RickAvery
Punt
To hit somebody from behind during a race causing the to crash, lose control and exit the race track.


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Added by: gkcx
Pushrod
A rod which provides a mechanical connection between a servo output and a control in order to translate movement from the servo to the control.


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See also: Pull-Pull Added by: grotto2
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