"Jon Meyer" wrote in
message ...
| Ok,
|
| Firstly VNE is very much limited by TAS not IAS. If
| you understand the maths behind how an ASI works then
| you will know that the ASI indicates a TAS based on
| an assumed air density equivalent to sea level. TAS
| is the speed that affects flutter, IAS is simply a
| gash estimate of TAS which is reasonable at low altitudes.
| Hence the rules of thumb for safe flight at altitude.
|
| Secondly, ground speed at altitude is much higher than
| TAS due to lower air density and can be greatly affected
| by very high velocity winds at altitude. This is how
| high average speeds can be achieved without exceeding
| TAS VNE. Try looking at your GPS groundspeed when at
| high altitude, it should be much higher than your IAS
| even when the wind effect is removed.

I am confused !
How can the ground speed exceed TAS when measured in still
air ?
TAS means TRUE Air Speed. i.e. the actual speed of the
aircraft through the particular parcel of air around the
aircraft. If this parcel of air is stationary with respect
to the ground, the ground speed of the aircraft must equal
the TAS.
Cheers, John G.