Andy Ross <[EMAIL PROTECTED]> said: > Jim Wilson wrote: > > On the other hand it could be lift. A possible clue: when I'm having > > trouble the "mach" reading seems to be way too high as compared to the > > KAIS reading just above. Examples: > > > > @ 19000ft 419KIAS MACH=0.91 > > @ 23000ft 344KIAS MACH=0.83 > > Those numbers look correct to me. As altitude increases, the speed of > sound is decreasing due to the drop in temperature and the absolute > speed corresponding to "indicated" airspeed is increasing due to the > drop in density. At sea level, mach one is about 700 KIAS. At the > tropopause, it's only something like 370.
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. Best, Jim _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
