For a given IAS an increase in altitude will result in
- an increase in induced drag.
- no change in the induced drag value.
- an increase in profile drag.
Explanation
At a constant indicated airspeed but higher altitude the true airspeed is greater, yet the wing must still support the same weight; the lower density means a higher angle of attack and stronger tip vortices are needed. Induced drag therefore increases with altitude at a given IAS, while profile drag, tied to dynamic pressure, stays roughly constant.
Kugen asking:
i thought induced drag is inversely proportional to altitude?
Community Comments (2)
D
dimky Posts: 514 01.10.2012 / 21:07
Hello.
With a decrease in density the aircraft must fly with a greater angle of attack (CL) to compensate for the loss of lift. Induced drag is dependant upon AOA, therefore induced drag increases with altitude.
With a decrease in density the aircraft must fly with a greater angle of attack (CL) to compensate for the loss of lift. Induced drag is dependant upon AOA, therefore induced drag increases with altitude.
M
MridulDev Posts: 48 02.10.2012 / 08:43
Thanks :)
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