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Found a table of air density vs Altitude
Sea level Density = .00237 Slug/Ft^3
Density at 20,000 = 0.001267 Slug/Ft^3 or a 47% decrease
So taking formula for air mass W = p*V*A with p 47% less than at sea
level
means you would get 47% less air mass flow (with the same cubic
feet/minute
of air volume flow) at 20,000 ft compared to what you would get at sea
level
for the same volume flow.
While cooler temps would help, it would not compensate for a 45% less air
mass flow.
Ed
But Jim does have a point.
Indicated Air Speed should be an indication of mass air right?
So if it cools enough at X mph IAS, it will work at any altitude at X mph
IAS?
And this should mean that the cooler air would give an advantage as the mass
air is cooler.
P.S.
I, as many I am sure, deeply appreciate your work in our behalf. If we may
ever assist you please let us know.
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