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  2. Airspeed indicator - Wikipedia

    en.wikipedia.org/wiki/Airspeed_indicator

    Airspeed indicator. The airspeed indicator (ASI) or airspeed gauge is a flight instrument indicating the airspeed of an aircraft in kilometres per hour (km/h), knots (kn or kt), miles per hour (MPH) and/or metres per second (m/s). The recommendation by ICAO is to use km/h, however knots (kt) is currently the most used unit.

  3. True airspeed - Wikipedia

    en.wikipedia.org/wiki/True_airspeed

    The true airspeed (TAS; also KTAS, for knots true airspeed) of an aircraft is the speed of the aircraft relative to the air mass through which it is flying. The true airspeed is important information for accurate navigation of an aircraft. Traditionally it is measured using an analogue TAS indicator, but as GPS has become available for civilian ...

  4. Indicated airspeed - Wikipedia

    en.wikipedia.org/wiki/Indicated_airspeed

    Indicated airspeed (IAS) is the airspeed of an aircraft as measured by its pitot-static system [1] and displayed by the airspeed indicator (ASI). [2] This is the pilots' primary airspeed reference. This value is not corrected for installation error, instrument error, or the actual encountered air density, [2] being instead calibrated to always ...

  5. V speeds - Wikipedia

    en.wikipedia.org/wiki/V_speeds

    V speeds. A single-engined Cessna 150L's airspeed indicator indicating its V-speeds in knots. In aviation, V-speeds are standard terms used to define airspeeds important or useful to the operation of all aircraft. [1] These speeds are derived from data obtained by aircraft designers and manufacturers during flight testing for aircraft type ...

  6. Flight instruments - Wikipedia

    en.wikipedia.org/wiki/Flight_instruments

    The airspeed indicator shows the aircraft's speed relative to the surrounding air. Knots is the currently most used unit, but kilometers per hour is sometimes used instead. The airspeed indicator works by measuring the ram-air pressure in the aircraft's pitot tube relative to the ambient static pressure.

  7. Airspeed - Wikipedia

    en.wikipedia.org/wiki/Airspeed

    An airspeed indicator is a flight instrument that displays airspeed. This airspeed indicator has standardized markings for a multiengine airplane. Aircraft have pitot tubes for measuring airspeed. In aviation, airspeed is the speed of an aircraft relative to the air it is flying through (which itself is usually moving relative to the ground due ...

  8. Pitot tube - Wikipedia

    en.wikipedia.org/wiki/Pitot_tube

    A pitot tube (/ ˈpiːtoʊ / PEE-toh; also pitot probe) measures fluid flow velocity. It was invented by French engineer Henri Pitot in the early 18th century, [1] and modified to its modern form in the mid-19th century by Henry Darcy. [2] It is widely used to determine the airspeed of aircraft; [3] the water speed of boats; and the flow ...

  9. Calibrated airspeed - Wikipedia

    en.wikipedia.org/wiki/Calibrated_airspeed

    EAS is used as a reference by aircraft designers, but EAS cannot be displayed correctly at varying altitudes by a simple (single capsule) airspeed indicator. CAS is therefore a standard for calibrating the airspeed indicator such that CAS equals EAS at sea level pressure and approximates EAS at higher altitudes.