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Airspeed

Aviation AirshipAirspeed indicator

Airspeed
Airspeed is the speed of an aircraft relative to the air. This speed is measured inside of the aircraft with an airspeed indicator, which is a device that can compute how fast the airplane is traveling.

 


Airspeed
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Airspeed indicators are calibrated under ISA conditions, only if these conditions exist in the atmosphere the instrument will indicate true airspeed. Some airspeed indicators have an outside air temperature (OAT) set knob.

Indicated airspeed (the speed of the aircraft as shown on the airspeed indicator)
IFR
Instrument flight rules (CASA definition - the weather is so bad you can't see out of the window) ...

Equivalent airspeed. Airspeed equivalent to CAS in standard atmosphere at sea level. As the airspeed and pressure altitude increase, the CAS becomes higher than it should be, and a correction for compression must be subtracted from the CAS.

Calibrated Airspeed: Indicated airspeed corrected for instrumentation errors, but not for air density.

Airspeed Indicator - An instrument or device that measures the airspeed of an aircraft through an air mass but not its groundspeed.
Altimeter - An adjustable cockpit instrument used to measure an aircraft's altitude.

Airspeed Control
Attitude flying is a simple concept which is used in both airplane and helicopter flying. The way it works is that the pitch attitude of the aircraft determines the forward speed, and power determines the altitude.

Airspeed Variations
Your airspeed indicator should vary little in the course of a well-executed flight, unless and until you change it by trimming your elevator up to a higher position or down to a lower position.

airspeed indicator
An onboard instrument which registers velocity through the air, in miles per hour or in knots
altimeter
An onboard instrument which senses air pressure in order to gauge altitude ...

Airspeed The speed of an aircraft relative to the air through which it is flying.

Airspeed. The speed of a flying machine or airship relative to the air as distinct from its speed relative to the ground. Thus an aeroplane flying at 200 m.p.h. airspeed against a 50 m.p.h. headwind will have a ground speed of only 150 m.p.h.

Airspeed Indicator
Airspeed drops or stays at zero with probable cause blockage in pitot tube
Ice is most common cause.
If weather has been cold enough to freeze water, turn on pitot heat during preflight.

True Airspeed
The airspeed of an aircraft relative to undisturbed air. Used primarily in flight planning and en route portion of flight.

TRUE AIRSPEED - The speed of an aircraft along its flight path, in respect to the body of air (air mass) through which the aircraft is moving. Also see CALIBRATED AIRSPEED, GROUND SPEED, INDICATED AIRSPEED.

True airspeed (TAS).
Airspeed corrected for instrumentation errors and air density; See Also: airspeed; Symbols: V sub 'TAS'; Typical Units: kt,ft/s; Dimensions: Length / Time;
True bearing.
Symbols: B sub T; Typical Units: rad, deg; ...

AIRSPEED - Speed of an airplane. (Deduct 25% when listening to a fighter pilot.)
BANK - The folks who hold the lien on a pilot's car.
CARBURETOR ICING - A phenomenon reported to by pilots that occurs immediately after they run out of gas.

Airspeed - 1. The speed of an airplane through the air. 2.True airspeed plus 20% when talking with other pilots. Deduct 25% when listening to a Navy aviator. 3. Measured in furlongs-per-fortnight in student aircraft.
...

Airspeed's around 50 knots; his inside wingtip anchors the turn, a foot or two above the scrub brush. What's strange is the way the airplane isn't nose-high, hanging on the prop like most planes shooting a near-stall, short-field approach.

AIRSPEED - The speed of an aircraft through the air, relative to the air mass in which it is moving.

AIRSTRIP - A natural surface used for the operation of aircraft, often in an unimproved state.

The airspeed indicated by ASI is corrected for temperature and attitude to give the true velocity VT. The correction is made using equation (2.6).
(2.6)
where ...

The airspeed and altitude together are called the mechanical energy . Engine power increases the mechanical energy, while dissipation decreases the mechanical energy.
1.2  Energy Conversion
Figure 1.2: Energy Conversion – Glide ...

The Airspeed should be 0, the Altitude 0, and the Throttle 100. Record the thrust
(F net) ___________and the Fuel Flow __________.
Now go ahead and change the altitude to 10,000 ft. and the Airspeed to 350. Did the thrust increase or decrease?

The airspeed is perhaps the most controversial figure talked about and we will see how you can obtain the CAS (Corrected Air Speed) from your IAS (indicated Air Speed). The IAS is just what it says, "indicated," by your instrument.

(See AIRSPEED.)
MACH TECHNIQUE [ICAO]- Describes a control technique used by air traffic control whereby turbojet aircraft operating successively along suitable routes are cleared to maintain appropriate MACH numbers for a relevant portion of the en ...

Blade airspeed at the outboard edge of the shaded circle is 0 knots. Within the reverse flow area, the air actually moves over the blade backwards from trailing edge to leading edge.

IAS The airspeed as shown by an airspeed indicator
IATA International Air Traffic Association
ICAN International Commission for Air Navigation ...

KTAS True airspeed, in knots.
LAAS Local Area Augmentation System, an enhancement of the Global Positioning System (GPS) providing greater navigation accuracy and system integrity.

Knots - Airspeed measured as the distance in nautical miles (6,076.1 feet) covered in one hour. (Approximately equal to 1.15 miles per hour.) ...

TAS - true airspeed. Rectified airspeed corrected for altitude and outside air temperature.

Next will come airspeed changes in level flight, in climbs, and in descents. You'll also learn to fly at slow speeds, which gives the airplane different handling characteristics from flight in the normal, or cruising speed realm.

True Indicated Airspeed
TIED
Positive radar contact with element/aircraft.

The airspeed you don't have. If God meant man to fly, He'd have given him more money. What's the difference between God and pilots? God doesn't think he's a pilot. Flying is not dangerous; crashing is dangerous.

The ratio of true airspeed to the speed of sound in the surrounding air. This varies with altitude, density and temperature
MAD
Magnetic Anomaly Detector ...

The airspeed indicator lags behind the actual airspeed of the aircraft by 1-3 seconds. Therefore, just as you get the needle to 70, it continues to move to a slower indicated speed.

IAS: Indicated Airspeed. Airspeed indicated by the Airspeed Indicator, without correction for position error, altitude, or outside air temperature.
IATA: International Air Transport Association.
I/C: In Charge.

A tailwind can increase the aircraft speed over the ground faster that it’s true air speed while a strong headwind may result in a slower ground speed than the aircraft true airspeed.

Airspeed - Speed of an airplane. Deduct 25% when listening to a Navy pilot.
Angle of Attack - Pick-up lines that pilots use.
Arresting Gear - A Policeman's equipment.
Bank - The folks who hold the lien on most pilots' cars.

Rotation speed, abbreviated VR, is one of three important airspeed settings calculated before every flight.

We begin by looking at a ducted fan operating statically (zero free-stream velocity or airspeed).

As intended by la Cierva, the rotor always turns regardless of the airspeed of the aircraft, though as airspeed decreases rotor rpm reduces to a minimum value at zero airspeed.

As the helicopter gains airspeed, the advancing blade develops greater lift because of the increased airspeed (for example, if your blades at a hover move at 300 knots and you fly forward at 100 knots, ...

They enable the wing to fly at lower airspeeds than without them by directing the airflow over the wing and preventing separation of the airflow. Basically, they are retractable slots.

It may seem to be a bit of a shocker for some to note that both an airspeed indicator and a compass were options for the J-2. Now that's "seat of the pants" flying! ...

Mach Number - The ratio of true airspeed to the speed of sound
Marker Beacon - Electronic navigation facility transmitting a 75 MHz vertical fan shaped radiated pattern
Mayday - International radiotelephony distress signal ...

FLIGHT DATA RECORDER (FDR) — A crash-resistant device that digitally records selected flight information, such as airspeed, altitude, heading, attitude, engine settings, G-loads, and the like.

Slow Flying: Flight at any airspeed less than Endurance Speed (q.v.).
SSLs: Safety Sense Leaflets, published by the UK Civil Aviation Authority.
SSR: secondary surveillance radar.

The combinations of altitude and airspeed from which structural damage to the helicopter will occur in case of a power failure. Also called the height velocity diagram.
Dead Stick ...

Cut the throttle, then wait as the plane slows it's airspeed, stalls out, then begins to free fall. Ideally, the aircraft will be around 30 - 50 feet high, providing nice space for you to perform the stunt and recover.
3 ...

Mach number - The ratio of true airspeed in relation to the speed of sound, e.g. Mach 0.8 = 80% the speed of sound, or 530 knots at sea level, and 465 knots at 36,000 feet
Medevac - MEDical EVACuation, as in "medevac helos" ...

WIND SHEAR Large changes in either wind speed or direction at different altitudes which can cause sudden gain or loss of airspeed. Especially hazardous when aircraft airspeeds are low on take-off or landing.

stall - A condition in which an improper angle of attack and a lack of airspeed combine to disrupt the airflow around an airfoil enough to result in the loss of lift which forces the aircraft to drop.

In addition to displaying a map that illustrates the position and direction of the plane, the system gives altitude, airspeed, distance to destination, distance from origination and local time.

variations, by the sensing and evaluation of varying pressures and resistance of the control surfaces transmitted through the cockpit flight controls.
- Speed sense-The ability to sense instantly and react to any reasonable variation of airspeed.

See also: Speed, Aircraft, Flight, Pilot, Altitude