An interesting but simple explanation can be found at
http://www.grc.nasa.gov/WWW/K-12/airplane/sound.html There is also a MACH
and speed of sound calculator there that you can download as a Java
applet. At http://www.grc.nasa.gov/WWW/K-12/UndergradProgs/index.htm there
are many such applets available including an airfoil sim and an engine
sim. These sims are great for learning how it all works.
I have to give credit to my 10 year old son for finding them though and
correcting me on the changes in the speed of sound at high
altitudes. Never too old to make a mistake!
Chris Ridley
[EMAIL PROTECTED]
Well, you're on the right track, but 100 KIAS at sea level would behave
pretty close to 100 KIAS at 40,000 feet. But 400 KIAS at sea level is
sub-sonic, while at 40,000 feet it is transonic. So, it behaves
differently. Don't ask me how differently, because I'm clueless about
aerodynamics beyond the speed of sound.
-Nick
On Jun 26, 2005, at 13:59, Bernhard Auzinger wrote:
Now, I think I got it right. The airspeed shown on the hud is not the true
airspeed. It's the indicated airspeed. At high altitudes the IAS is much
lower because of the lower air pressure etc. But aerodynamically 400 knots
IAS at sea level and 400 knots IAS at 40000 ft behave identical.
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