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RCUniverse Glossary





Total Words: 412
Words Found in Search: 29
Viewing Records: 1 - 29
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WordDefinition
Damping
Damping describes the lessening of impact on a car through its shock absorbers. Damping can be accomplished by changing the stiffness of a shock absorber. A "soft" damping shock can provide more traction in a turn but limits responsiveness because the car must "recover" after the turn. On the other hand, "stiff" damping increases responsiveness, but compromises traction in severe turns.


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See also: Shock Absorber Added by: mkranitz
Dead Stick
Refers to an aircraft whose power has died mid-flight. Dead stick airplanes may glide. Helicopters must auto rotate to return to the ground safely.


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See also: Autorotation Added by: mkranitz
Deadband
Deadband is the engineering term that describes the amount of servo position error that the servo amplifier must exceed before the amplifier will send current to drive the motor to close the position error.

Some in the hobby use the term to describe to the distance one can move a transmitter stick before the servo begins to travel in reaction to it.


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See also: Exponential Added by: w8ye
Decalage
Term that usually referes to the net difference in the angle of attack between the wing and the stabilizer.


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Added by: fritzke
DEPS
Dual elevator pushrod system.


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Added by: TOYMAKER
Depth Charge
From high speed inverted flight the pilot performs a double positive snapasaurus resulting in rapid deceleration and ending in a low altitude upright harrier.


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See also: Snapasaurus Added by: marcv
Dethermaliser (D/T)
A device operated by a slow-burning fuse or by a mechanical or electronic timer that puts a free-flight aircraft into a super-stalled condition to bring it down after a pre-set flight time.


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Added by: felix.ragav
Dialed
This is a slang term used in the 1/8 scale buggy world. It means that after all the hard work of tuning your suspension, shock oil, diff oil, and other adjustments, your buggy is finally tuned.


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Added by: dryvr
Differential
A differential is a gearing mechanism that permits the drive wheels (powered wheels) to spin at different rates while turning. Since wheels on the outside diameter of the turn must travel a greater distance than those on the inside, the differential eliminates slippage on the turn.


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See also: Ackerman Angle Added by: Robby
Differential Throw
Ailerons that are set up to deflect more in the upward direction than downward in order to counteract adverse yaw.


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See also: Aileron | Adverse Yaw Added by: Lightfoot
Dihedral
Dihedral describes the angle between two wing halves. A wing with dihedral is angled such that when viewing the airplane from the front, the wing tips are higher than the center joint on the two wing halves. Dihedral adds stability to airplanes and is often seen on trainers.


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See also: Anhedral | Polyhedral Added by: mkranitz
Diode
A semiconductor device used to control the flow of electric charge. High-rated schottky diodes are used in single-direction ESCs to prevent back-EMF (voltage 'spikes') generated by the motor from entering the ESC.


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Added by: rcnz
Dive
A steep descent of an airplane at greater than the maximum horizontal speed. (Thank you Websters)


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Added by: deves
DOD
"Down On the Deck", the act of flying the model close to the the ground.


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See also: Huck it! Added by: southern_touch9
Dogbone
A part of the drivetrain connecting the outdrive to the axle. This allows the differential to transfer power from the engine out to the axle and tires of the car or truck.


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Added by: mkranitz
Dolly
A wheeled frame which a model sits on to effect a take-off. The dolly either remains on the ground or drops off almost immediately.


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Added by: felix.ragav
Dope
Dope in aeronautics is slang for a varnish used to waterproof, strengthen, etc.


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Added by: poobee
dork(ed)
In general, a landing attempt that went bad at the last few seconds of flight. Usually causing minor or no damage, but in some instances, totally destroying the plane.


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Added by: StickKiller
Doubler
To add a extra peice of ply or balsa to strengthen a stress area such as a wing saddle. firewall or landing gear attachment , { also called lamanation}


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Added by: dalolyn
Down Thrust
In trainer airplanes (those with flat-bottomed wings), it is often necessary to mount the engine at a downward angle relative to the angle of the wing. This helps compensate for excessive lift generated by the wing.


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See also: Lift Added by: mkranitz
Drafting
Drafting is the action of following a vehicle closely enough to shield your vehicle from the wind that would normally cause drag on your vehicle. It is very difficult to draft a small R/C car.


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Added by: mkranitz
Drag
The force that resists movement of any object through the air. Can apply to surface or air vehicles.


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Added by: mkranitz
Drive Washer
The washer that is applied to an engine between the thrust washer and propeller or spinner backing plate. Typically has grooves on the front to increase grip against the backing plate or propeller.


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Added by: Rob40
Droop
Droop is the distance the wheel drops from normal ride height when the car is lifted off the ground. Adjustment is either via droop screws in the wishbones that rest on the chassis; or spacers under the shock piston inside the shocks. Droop is another tuning aid and can have a dramatic effect on handling.


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Added by: RC-Drift UK
DSM
The newest radio technology. The bands are on 2.4 ghz. Direct Sequencing Spread Spectrum modulation is used. It scans the 79 channels, and finds an open one, achieving glitch-free performance.

The DSM system scans the 2.4Ghz band looking for an open channel. When an unused channel is found the system locks on that channel and transmits providing the following benefits: • No more waiting for an open frequency • No need to impound the radio • Eliminates the need for a frequency board and frequency clips • Interference for other radios is a thing of the past • No crystals are needed • 2.4ghz worldwide band is approved for international use. No need to change frequencies when traveling abroad • Built-in failsafe drives the servos to a preset position (usually full brakes) in the unlikely event of radio interference • The DSM system literally plugs into popular module based 3-channel transmitters allowing most racers to convert to DSM technology right away. • Short 8" receiver antenna is easy to mount • The soon-to-be-released DSM telemetry module will allow real time monitoring of head temperature, rpm, speed, battery voltage, lap time, etc. • No maintenance or tuning required (always stays in tune) • Up to 79 users can simultaneously operate DSM systems DSM System Specifications • Frequency Band 2.400-2.4835 GHz • Channels 79 • Channel Spacing 1 MHz • Range 3000 ft • Latency 7.4 Ms • Resolution/Channel 4096 steps


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Added by: MBX5T Maniac
Dual conversion
Receivers that sample signals twice to better filter unwanted interference.


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Added by: AgCat1982
Dual Rates
Dual rates are simply transmitter switch inputs that allow the user to program two sets of control parameters that the user can switch to instantly.


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Added by: mkranitz
Dumb Thumb
Dumb Thumb is a term widely used by those who pilot R/C Model Airplanes. The word means a loss of Aircraft Control due to the Brain not working in proper coralation, or sending the correct input signals to the Fingers or Thumbs while opperating a Model Aircraft Radio, thus causing a crash, or near miss!


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Added by: ckangaroo70
Dutch Roll
Many swept wing aircraft suffer a dynamic instability problem known as Dutch Roll.

Dutch roll happens when the aircraft has relatively strong static lateral stability (usually due to the swept wings) and somewhat weak directional stability (relatively.) In a Dutch roll the aircraft begins to yaw due to a gust or other input. The yaw is slow damping out so the aircraft begins to roll before the yaw is stopped (due to the increased speed of the advancing wing and the increased lift due to the swept wing effect.)

By the time the yaw stops and begins to swing back toward zero slip the aircraft has developed a considerable roll rate and due to momentum plus the slip angle the aircraft continues to roll even once the nose has begun returning to the original slip angle.

Eventually the yaw overshoots the zero slip angle causing the wings to begin rolling back in the opposite direction


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Added by: DCGayhart
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