compare coefficients/aero models
compare coefficients/aero models
(OP)
I have two (2) sets of drag coefficients, purportedly for the same thing. These drag coefficients are used in separate aero models. I know a lot about one aero model, and very little about the other. One thing that stands out to me is that one model uses a constant gravity model, whereas the other uses a varying gravity.
I was wondering if anyone had some thoughts on how I can objectively compare these drag coefficient sets, perhaps using the differing gravity models? Obviously, a simple plot of the two sets shows the differences, but I have this thought stuck in my head that somehow I can better correlate the coefficients, or perhaps the effects of the coefficients, to show how the aero models compare.
Any ideas?
Thanks!





RE: compare coefficients/aero models
if one model has this feature, can you disable it (set it to be constant) and compare the two models ??
RE: compare coefficients/aero models
Have you never tested vehicles up at the Rock? g decreases with altitude...
RE: compare coefficients/aero models
the bigger r, the smaller F ...
and, courtesy of wiki "at an altitude of 400 kilometres (250 miles), equivalent to a typical orbit of the Space Shuttle, gravity is still nearly 90% as strong as at the Earth's surface" ... not a very strong effect ...
RE: compare coefficients/aero models
The 10% difference on Shuttle flights was a subject of a long ago conversation in a bar with one of the lads that wrote flight software. Apparently that correction was included in the HP-41C software for the backup-backup reentry system.