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Forum: Tech Log

21st May 2006, 10:03

Replies: 32

Relation between IAS and Mach number

Views: 28,827

Posted By Rivet gun

I think it comes down to the ideal gas...

I think it comes down to the ideal gas assumption. In an ideal gas gamma is constant and for a diatomic ideal gas (two atom molecules) the theoretical value is 1.4.

But of course an ideal gas is...

Forum: Tech Log

20th May 2006, 09:52

Replies: 32

Relation between IAS and Mach number

Views: 28,827

Posted By Rivet gun

Old Smokey, Thanks, It is nice to get a...

Old Smokey,
Thanks, It is nice to get a definitive answer from somebody who really understands this stuff.

Since you give a formula for CAS, I'll give another CAS formula for comparison.
...

Forum: Tech Log

19th May 2006, 11:07

Replies: 32

Relation between IAS and Mach number

Views: 28,827

Posted By Rivet gun

Lets get rid of these darn moles! The universal...

Lets get rid of these darn moles! The universal gas constant is 8.314 J/mol/K. If we multiply this by the average moles per kilogram for dry air (34.53) we get the specific gas constant for air which...

Forum: Tech Log

18th May 2006, 09:42

Replies: 32

Relation between IAS and Mach number

Views: 28,827

Posted By Rivet gun

Not so, at least as I understood it. You are...

Not so, at least as I understood it.

You are flying a constant flight level and the autothrottle holds a constant Mach number. You fly from a colder to a warmer air mass:

Going to the warmer...

Forum: Tech Log

17th May 2006, 13:58

Replies: 32

Relation between IAS and Mach number

Views: 28,827

Posted By Rivet gun

Relation between IAS and Mach number

This quote comes from the FAA's "Airplane Upset Recovery Training Aid" referring to Mach stability:

"This stability can be independent of airspeed if, for example, the airplane crosses a cold...

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