The power required at low altitude for a given IAS is
- unchanged with altitude.
- higher.
- lower.
Explanation
For a given indicated airspeed the dynamic pressure and therefore the drag are the same at any altitude. However, at low altitude the air is denser, so the true airspeed is lower for that same IAS. Since power required equals drag times true airspeed, the lower TAS at low altitude means less power is required.
ashwin.b asking:
Power is dependant on TAS and not IAS
Power =velocity *drag
Community Comments (2)
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edya371 Posts: 2 26.06.2012 / 18:04
TAS is dependant on IAS so in this question it is not important point. In this question asked about power produced by engine. On lower altitude there is higher density of air, so lower power of engine is required for the same thrust.
D
diaandrita Posts: 4 06.05.2014 / 08:44
Please explain this question?
Is it needs more power because more drag at low altitude due to higher density?
Is it needs more power because more drag at low altitude due to higher density?
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