I used FL 450 only to exaggerate the raw effect of reduced aerodynamic pressure,
and other things happen with really high performance aircraft way up there.
However, FAR Part 23 is clear that Vne is determined with reference to several
things, all of which have to with pressure, IOW air density. If there is a
significant variance with Vne vs. altitude, then the ASI must have a way to so
indicate. No Part 23 airplane in the Europa's class has such an ASI, right?.
A simple red line (what don't move!) complies with the rules.
Fred F.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=135939#135939
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