AVIATION & AERONAUTIC CALCULATOR
Cas To Eas
A precise tool.
What is the Cas To Eas & How does it work?
The Calibrated Airspeed (CAS) is the indicated airspeed corrected for instrument and position errors, but not for altitude. It is a crucial parameter for pilots to understand the performance of their aircraft at different altitudes.
Equivalent Airspeed (EAS) is the speed of the aircraft relative to the surrounding air, adjusted for compressibility effects but not for non-standard atmospheric conditions or temperature variations. EAS provides a more accurate representation of true airspeed in terms of aerodynamic forces.
EAS = CAS cdot sqrt{frac{T_0}{T}}
EAS = Equivalent Airspeed, CAS = Calibrated Airspeed, T0 = Standard sea-level temperature (288.15 K), T = Temperature at the altitude of interest (K)
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Frequently Asked Questions
What is the difference between CAS and EAS?
Calibrated Airspeed (CAS) is indicated airspeed corrected for instrument errors, while Equivalent Airspeed (EAS) accounts for compressibility effects but not temperature variations.
When would I use this calculator?
Use this calculator to convert CAS to EAS when analyzing aircraft performance at different altitudes.
How does altitude affect the conversion from CAS to EAS?
Altitude affects the conversion because EAS adjusts for compressibility effects, which vary with altitude.
Can I use this calculator for any aircraft type?
Yes, this calculator can be used for any aircraft type as long as you have the correct CAS value.
What is the formula to manually convert CAS to EAS?
The formula involves using the standard atmosphere model and the Mach number to adjust for compressibility effects.
Why is it important to know the difference between CAS and EAS?
It’s important because CAS does not account for air density changes with altitude, while EAS provides a more accurate representation of true airspeed.
Can this calculator handle non-standard atmospheric conditions?
No, this calculator does not adjust for non-standard atmospheric conditions; it assumes standard atmosphere conditions.
Results are for informational purposes only and do not constitute professional advice.