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Lower Speed versus Higher Optimum Altitude

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Lower Speed versus Higher Optimum Altitude

Old 17th Apr 2010, 04:03
  #21 (permalink)  
Join Date: Jun 2004
Location: Australia
Posts: 1,844

Just to add a footnote to the preceding wise comment, you may note that as an aircraft increases Flight Level in accordance with optimum step climb, that the Mach Number remains relatively constant (within a very small margin). Naturally, at a constant Mach Number with increasing Flight Level, CAS (and importantly EAS) reduces.

Thus, the High Speed Polars remain quite constant, whilst the Low Speed Polars reduce, leading to overall reduction in drag.

411A, it's not Ebonics, it's cell-phoneese!!! Dun U no dat! Every time that a young Prooner posts (well almost every time) I have to get my kids to translate it for me

Ti Tien,

Old Smokey (with apologies to shockwave1973 for poor anglisitasion of Chinese)
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Old 17th Apr 2010, 06:11
  #22 (permalink)  
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old smokey

thanks, i nominate you of my angel of the day! cheers.
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