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  1. en.wikipedia.org › wiki › AirspeedAirspeed - Wikipedia

    The true airspeed (TAS; also KTAS, for knots true airspeed) of an aircraft is the speed of the aircraft relative to the air in which it is flying. The true airspeed and heading of an aircraft constitute its velocity relative to the atmosphere.

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  3. pilotinstitute.com › airspeed-types6 Different Types of Airspeed: How to Calculate Each

    • Indicated Airspeed (IAS) The direct instrument reading obtained from the Airspeed Indicator (ASI), uncorrected for variations in atmospheric density, installation error, or instrument error.
    • Calibrated Airspeed (CAS) Calibrated Airspeed is Indicated Airspeed (IAS) corrected for installation error and instrument error. Although manufacturers attempt to keep airspeed errors to a minimum, it is not possible to eliminate all errors throughout the airspeed operating range.
    • True Airspeed (TAS) True Airspeed is Calibrated Airspeed (CAS) corrected for altitude and nonstandard temperature. Because air density decreases with an increase in altitude, an aircraft has to be flown faster at higher altitudes to cause the same pressure difference between pitot impact pressure and static pressure.
    • Ground Speed (GS) Groundspeed is the actual speed of the airplane over the ground. It is the True Airspeed (TAS) adjusted for wind. While not an airspeed, GS is important for navigation and has a major impact on the time it takes to get to a destination.

  4. science.howstuffworks.com › transport › flightWhat's the Difference Between Airspeed and Ground Speed?

    Mar 12, 2024 · Learn the difference between airspeed and ground speed, and how they affect aircraft performance and fuel efficiency. Airspeed is how fast an airplane flies relative to the air, while ground speed is how fast it travels over the ground, factoring in wind speed.

  5. en.wikipedia.org › wiki › Airspeed_indicatorAirspeed indicator - Wikipedia

    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).

  6. www.boldmethod.com › blog › listsThe 4 Types Of Airspeed, And What Each One Means For You

    • Indicated Airspeed (IAS) This one's pretty simple. It's read right off your airspeed indicator and is usually what you'll reference in the cockpit for speed changes.
    • True Airspeed (TAS) True airspeed is the speed of your aircraft relative to the air it's flying through. As you climb, true airspeed is higher than your indicated airspeed.
    • Groundspeed (GS) The movement of your airplane relative to the ground is called groundspeed. It's true airspeed corrected for wind. With a true airspeed of 100 knots and a tailwind of 20 knots, you'd be flying a groundspeed of 120 knots.
    • Calibrated Airspeed (CAS) Calibrated airspeed is indicated airspeed corrected for instrument and positional errors. At certain airspeeds and with certain flap settings, the installation and instrument errors may total several knots.

  7. pilotinstitute.com › airspeed-indicatorThe Airspeed Indicator – How it Works and What it Does

    Jan 23, 2022 · Learn how an airspeed indicator measures air pressure and displays airspeed in knots. Find out why airspeed is important for flight, and what the different colors and bands on the dial mean.

  8. skybrary.aero › articles › air-speed-indicatorAir Speed Indicator | SKYbrary Aviation Safety

    An air speed indicator (ASI) is a device for measuring the forward speed of the aircraft. The ASI uses the aircraft pitot-static system to compare pitot and static pressure and thus determine forward speed.