The Airspeed Indicator & Types of Airspeed (IAS, CAS, EAS, TAS & GS)
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- Опубликовано: 21 ноя 2024
- This video explains how an airspeed indicator (ASI) works, as well as the different types of speeds used in aviation, such as the IAS, CAS, EAS, TAS and GS.
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The 3 1:34
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Useful method to remember different speeds and their corrections:
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IAS -> Instrument and Position error =
CAS -> Compressibility error =
EAS -> Density error =
TAS
Try drawing it on a paper, it will be even clearer!
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@@n1msu was not aware of the plagiarism , but thought the structure was clear - voice was of no concern
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An airspeed indicator is an essential instrument in an aircraft's cockpit that measures the aircraft's speed through the air, known as airspeed. It displays the airspeed in knots, miles per hour, or kilometers per hour. The airspeed indicator is a critical component in aviation as it helps the pilot to maintain a safe and efficient flight path.
There are different types of airspeeds that an airspeed indicator measures, including:
1. Indicated Airspeed (IAS): This is the airspeed that the airspeed indicator displays. It is measured relative to the aircraft's reference point, which is typically the leading edge of the wing. IAS is the speed that the pilot sees on the airspeed indicator, and it is affected by factors such as altitude, air density, and angle of attack.
2. Calibrated Airspeed (CAS): This is the true airspeed corrected for instrument error, altitude, and air density. CAS is the actual speed of the aircraft through the air, and it is the speed that is used to calculate other important parameters such as lift, drag, and range.
3. Equivalent Airspeed (EAS): This is the airspeed that an aircraft would have at standard sea level conditions (ISA) and zero altitude, given the same lift and drag as the actual flight conditions. EAS is used to compare the performance of an aircraft at different altitudes and air densities.
4. True Airspeed (TAS): This is the airspeed corrected for the effects of wind. TAS is the speed at which the aircraft is moving relative to the ground, and it is the speed that is used to calculate ground speed.
5. Ground Speed (GS): This is the speed at which the aircraft is moving relative to the ground, taking into account the effects of wind. GS is important for navigation and is used to calculate the time required to reach a destination.
In summary, the airspeed indicator measures IAS, which is corrected to CAS, EAS, and TAS to provide the pilot with accurate information about the aircraft's speed and performance. GS is then calculated based on the TAS and wind information.
Amazing videos
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Doubt: Regarding GS...
The dynamic pressure on the Pitot tube should change in head winds or tail winds..
Thus the IAS itself should change in headwind or tailwind...
For e.g. An aircraft in calm wind shows IAS 100 knots..
Assuming at 1000 feet.. TAS also approx 100 or 102 knots..
..
Now there's a strong headwind, whether the a/c IAS still show 100 knots with the same power by the engine??
I guess it should show higher speed as the pressure is higher now....
Sorry if it's stupid!!!
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10:43 I am sorry isnt this the whole reason of the static port feeding into the airspeed indicator to equalize the pressure and density of the air, or am I missing something?
At 12:30 it said at sea level under standard temp IAS = TAS. Shouldn't it be CAS = TAS given that IAS does not include calibration for instrument errors and position errors ? or is it part of the assumption that you are in level unaccelerated flight with no instrument errors ? or am I incorrect? (love the vids thanks a million can't wait to start flying.)
Amazing :)
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Hello! In the example of TRUE AIRSPEED, after getting the percentage as 20 then why do we multiply 110 x (0.20) 0r 110 x (1.20) to get the true airspeed 132?
At higher altitudes the dynamic pressure is lesser, therefore ASI will under read.
05:37 IAS (Pure dynamic pressure, no corrections)
06:20 EAS (IAS + Position&Instrument Error)
08:26 CAS (EAS + Compressibility Error)
09:47 TAS (CAS + Density Error)
Thank you very much