> Just a few observations about high altitude flight with FGFS/JSBSim:
>
> - At 80,000 feet you fly through the sky and now have a white background.
You are "outside" the inverted bowl Curtis designed. You can play with the
size in SGSky. I added an "altitude factor" to darken the sky from blue to
deep violet to dark and increased the radius of the bowl At 125,000 the sky
is dark, and turns blue as you descend, but the model really doesn't work
that well. The blending between bands is poor and you would need a few more
bands. (You might want to read the tutorial on the website, nice model at
lower altitudes, but not designed for what you are asking).
Sky color is a function of density ( # of molecules avail to reflect/refract
light ). half the atmosphere is below 18K feet. By 75K its mostly below you.
Better effects require a better model = more compute time.
> - The wind sound doesn't fade out as you go higher, and doesn't disappear
> when you go supersonic.
You better have pressure above 50K feet or you boil. Wind sound is minimal
at ALL altitudes in a pressurized cockpit/cabin and swamped by other white
noise like air conditioning, engine vibration, your breathing, oxygen flow,
etc
JW
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