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Part 1: Document Description
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Citation |
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Title: |
From CAS to EAS – Calculating and Plotting the Compressibility Correction Chart |
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Identification Number: |
doi:10.7910/DVN/6QWEX1 |
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Distributor: |
Harvard Dataverse |
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Date of Distribution: |
2024-04-10 |
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Version: |
1 |
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Bibliographic Citation: |
Sarmiento Beltran, Danny Steeven, 2024, "From CAS to EAS – Calculating and Plotting the Compressibility Correction Chart", https://doi.org/10.7910/DVN/6QWEX1, Harvard Dataverse, V1 |
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Citation |
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Title: |
From CAS to EAS – Calculating and Plotting the Compressibility Correction Chart |
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Alternative Title: |
Links to all related documents: |
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Identification Number: |
doi:10.7910/DVN/6QWEX1 |
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Authoring Entity: |
Sarmiento Beltran, Danny Steeven (Hamburg University of Applied Science) |
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Other identifications and acknowledgements: |
Scholz, Dieter |
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Date of Production: |
2024-03-27 |
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Software used in Production: |
Excel |
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Distributor: |
Harvard Dataverse |
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Access Authority: |
Scholz, Dieter |
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Depositor: |
Scholz, Dieter |
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Date of Deposit: |
2024-03-27 |
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Series Name: |
Digital Library - Projects and Theses - Prof. Dr. Scholz |
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Holdings Information: |
https://doi.org/10.7910/DVN/6QWEX1 |
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Study Scope |
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Keywords: |
Engineering, Luftfahrt, Aeronautics |
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Topic Classification: |
Aerospace |
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Abstract: |
Purpose – The conversion between calibrated airspeed (CAS) and equivalent airspeed (EAS) is relatively cumbersome, because it involves the calculation of incompressible flow, for which the equations are quite long. If calculations on the computer are required, conversions with equations are necessary. In contrast, this project calculates a CAS to EAS Compressibility Correction Chart, which allows to convert CAS to EAS very quickly by reading the correction from a graph. --- Methodology – In Excel, compressibility correction is achieved through flight mechanics formulas. The correction is calculated with two distinct functions, one based on Mach Number and the other on pressure altitude. These functions are graphed individually and then integrated to produce the Compressibility Correction Chart. --- Findings – The Compressibility Correction Chart was successfully recreated as a 2-D graph. Upon comparison with other correction charts, the EAS-CAS-results demonstrate a mere 0% deviation, proving the accuracy of the findings and validating their near-perfect alignment. --- Research Limitations – Due to a limitation in Excel, which allows for 255 series for plotting, the range of input parameters had to be adjusted accordingly. The iterations of altitude span 1000 ft intervals, while those for Mach Number span 0.05 intervals. --- Practical Implications – Pilots can easily use the Compressibility Correction Chart for quick and highly accurate calculations when needed. --- Originality – CAS-EAS Compressibility Correction Charts are available in other sources. This paper represents a recreation of the 2-D Correction Chart by the combination of plots: one as function of Mach Number and the other of pressure altitude, using the Excel Software. |
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Methodology and Processing |
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Data Access |
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Other Study Description Materials |
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Related Publications |
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Citation |
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Title: |
Sarmiento Beltran, Danny Steeven, 2024. From CAS to EAS – Calculating and Plotting the Compressibility Correction Chart. Project. Hamburg University of Applied Sciences, Aircraft Design and Systems Group (AERO). Available from: |
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Bibliographic Citation: |
Sarmiento Beltran, Danny Steeven, 2024. From CAS to EAS – Calculating and Plotting the Compressibility Correction Chart. Project. Hamburg University of Applied Sciences, Aircraft Design and Systems Group (AERO). Available from: |
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Label: |
CAS-EAS_Compressibility_Correction_Chart.xlsm |
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Notes: |
application/vnd.ms-excel.sheet.macroEnabled.12 |
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FigureSarmiento_landscape.png |
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image/png |
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FigureSarmiento_large.png |
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image/png |