Andy Ross <[EMAIL PROTECTED]> said: > Jim Wilson wrote: > > Yeah but look at the values again...we're getting close to tropopause > > value at 23000ft. Mach should be well over 600knots at 23000ft, > > unless it's _really_ warm. > > Mach 1 at the tropopause and above is just about exactly 295 m/s, > which is 573 knots *true* airspeed. The numbers you quote are > "indicated" airspeed (that's the "I" in KIAS). That means that they > are corrected for density (basically by the square root of the density > ratio at subsonic speeds) and are much lower than true speeds at low > densities. At 23000 feet MSL, the correction is about 1.5, which > agrees very closely with the numbers you cite. >
Ah...oh. Sorry about that. :-) Best, Jim _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
