As jonkster has said IAS gives a measure of how the aircraft will behave aerodynamically, even at altitude, even though it is underreading relative to the True Airspeed. At altitude your Vne is most likely going to be determined by Mach effects (e.g shock wave formation) so on a all singing dancing PFD you’ll quite possibly see the high speed Limit varying relative to indicated airspeed.
Originally Posted by
Cralis
One thing, unrelated, but if the speed is between V1 and "V2min"
That seems to spell disaster....
It could, so that is one of the reasons why we do a performance calculation before
every take off - to ensure that the combination of runway, thrust and aircraft loading is such that there is no “gap” between the various controllability speeds...i.e. you are not going to be in a situation where you are too fast to stop but not going fast enough to be able to control the aircraft. If you can’t satisfy that criteria you need to look at changing one of the variables (runway, thrust, loading).