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Forum: Tech Log

5th Oct 2010, 20:07

Replies: 16

speed vs mach at altitude

Views: 10,449

Posted By PBL

M = a.TAS and a=sqrt(gamma.R.T) so M =...

M = a.TAS and a=sqrt(gamma.R.T) so M = A.sqrt(T).TAS where A is constant. So M/TAS = A.sqrt(T).

I hope you are not disagreeing!

First, pressure altitude??? Why make things complicated? Why...

Forum: Tech Log

5th Oct 2010, 05:52

Replies: 16

speed vs mach at altitude

Views: 10,449

Posted By PBL

Sorry, I was thinking of the difference between...

Sorry, I was thinking of the difference between TAS and EAS.

Let me quote at length from John D. Anderson Jr's Introduction to Flight, one of the most ubiquitous textbooks on intro aerodynamics,...

Forum: Tech Log

4th Oct 2010, 19:19

Replies: 16

speed vs mach at altitude

Views: 10,449

Posted By PBL

Yes, perhaps you do! The difference between...

Yes, perhaps you do!

The difference between CAS and EAS is due to the density of the air through which you are flying. Air density is not a "compressibility effect", so I find it surprising that...

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