On Wed, 2007-01-31 at 19:19 +1000, Mike Borgelt wrote: > At 05:52 PM 31/01/2007, you wrote: > >Good work Ken.. Reminds me of the time you worked out that a Ka6 > >could not fly above 96,000 feet because the Vne equaled the stalling > >speed.. good memories from 40 years ago. :) > > > > I suspect the limiting mach number would make it somewhat less than 96000 > feet. I cannot recall how I arrived at the number I did (whatever it was) but using the calculator at http://www.digitaldutch.com/atmoscalc/ I see that at 103000 ft the air density is 0.014518 kg/m**3 and the speed of sound is 302.729518 m/s Assuming a stalling speed at ¨sea level¨ of 16.5 m/s the stalling speed at 103000 ft would be sqrt(1.225/0.014518) times 16.5 or 151.6 m/s 0.5 M may be below the critical Mach number for the Ka6 but goodness knows at what speed the aircraft would start to flutter. In any case I doubt that you could get into the cockpit in a space suit. > If you want to be really fussy about the water column you should > correct the density of the water for temperature. > True cheers Ken
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