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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