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**Mxsmanic** · April 17th 07, 04:09 PM posted to rec.aviation.piloting,rec.aviation.student

writes:

Air does not behave very much like an imcompressible fluid at low air
speeds. Not even close.

That's not what the engineers say.

Under some conditions, low air speeds is one of them, air can be
treated like it is an imcompressible fluid.

The difference between TAS and EAS is only about 13% even at Mach 1. Since
small aircraft come nowhere near to Mach 1, for all practical purposes air is
incompressible for most calculations.

Obviously air, being a gas, can be compressed, but taking that into account at
low speeds greatly complicates the calculations, and the final result isn't
significantly different.

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