Standard Atmosphere - Airspeed Exercise

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ASCI 309 Standard Atmosphere – Airspeed Exercise

Part 2 Appendix B

1. Find the Calibrated Lift-Off Speed [KCAS] using the chart below, which is a typical example of an aircraft position error correction chart. (Consider that the gear would obviously still be in the down position at lift-off). 

2. Find the Equivalent Lift-Off Speed [KEAS] using your Calibrated Airspeed from #1 above and the Pressure Altitude for your selected airfield (from A). (Compressibility Correction Chart see “Flight Theory and Aerodynamics,” Fig 2.10). Comment on your findings. Why was/wasn’t the Compressibility Effect in your case negligible?

3. Find the True Lift-Off Speed [KTAS] (use the Density Ratio in question #7 of the Airspeed Exercise Part 1 document).

4. Calculate the Dynamic Pressure ‘q’ [lb/ft2], based on the TAS above. (Dynamic Pressure definition and formula can be reviewed in “Flight Theory and Aerodynamics” page 22 (EQ 2.1); make sure to use a formula consistent with a Lift-Off Speed in kts.

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