September 9, 201411 yr Hopefully simple question of the day but be darned if I can find any info anywhere, even Google doesn't know......... I know what KIAS and KTAS are but what the heck is CIAS?
September 9, 201411 yr Author Calibrated to what? Atmoshperic pressure? That is the same as KTAS, no? Guess I'm looking for more of an explanation than just the acronym meaning.
September 9, 201411 yr KCAS is Indicated Airspeed corrected for instrument error (friction etc in the airspeed indicator) and position error (location and angle of the pitot tube) EAS - Equivalent Airspeed is KCAS corrected for air compressability (not applicable until you start approaching the speed of sound) TAS - True Airspeed is EAS corrected for altitude and temperature. Cheers, DB
September 9, 201411 yr As far as I am aware, CIAS is not a proper acronym. Though Calibibrated Airspeed is probably what is meant. It is IAS corrected for instrument and position error. It's tricky and redundant to explain in a post, but you will find lots of info if you look for CAS (airspeed). Like http://en.wikipedia.org/wiki/Calibrated_airspeed.
September 10, 201411 yr Author As far as I am aware, CIAS is not a proper acronym. Though Calibibrated Airspeed is probably what is meant. It is IAS corrected for instrument and position error. It's tricky and redundant to explain in a post, but you will find lots of info if you look for CAS (airspeed). Like http://en.wikipedia.org/wiki/Calibrated_airspeed. Well it is heavily used in an old Constellation Manual so it seems official, or was. (see pic)
September 10, 201411 yr Moderator I'm not 100% sure! but I believe this acronym actually refers to a "corrected indicated airspeed" and not calibrated airspeed. At least during my private and instrument training I've never learned about a "calibrated indicated airspeed". Cheers, Pete I9-13900K, RTX 4090, DR5-6000MHZ, CORSAIR ICUE H150I ELITE, ASUS PRIME Z790-P, THERMALTAKE TOUGHPOWER GF3 1350W, WIN 11
September 10, 201411 yr I'm not 100% sure! but I believe this acronym actually refers to a "corrected indicated airspeed" and not calibrated airspeed. At least during my private and instrument training I've never learned about a "calibrated indicated airspeed". Cheers, Pete I think they're referring to the same thing. The Constellation is over 60 years old, so the acronyms could have changed since then. The difference between CIAS and IAS on the excerpt above (just a couple knots) seem about right for a Calibrated Airspeed correction. Cheers, DB
September 10, 201411 yr Caliberated -5 +5 kts. Ryzen 5 1600x - 16GB DDR4 - RTX 3050 8GB - MSI Gaming Plus
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