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Please help, I'm a bit confused. I have a flying wing, which has a typical LD
ratio of 30. When I do a T7 analysis with inboard flaps going from 0 to 30deg,
I get no change in Cm, and a wild improvement in L/D. It seems unlikely that I
can get have no change in Cm, but have a very improved L/D. I find the same
massive improvement when I try to model a left bank situation. My L/D goes
from 30, which is respectable, to 70, which is highly unlikely...
What am I doing wrong?
That's because if you use flaps as a control variable, then the analysis may
only be non-viscous. Viscous drag is therefore completely neglected, that
explains the jump in L/D.
hmm.. I see the screenclip (in .png format) does not display. Lets try a .JPG
Thank you Francesco.
Do you know why the Cm does not change? It doesn't seem right that on a flying
wing, I drop flaps and there is no change in Cm.
ok, attaching imgs seems broken. Here is a direct link http://www.mediafire.c
It seems I don't see the picture... but anyway, in a T7 analysis Cm is by
definition zero (or very close to zero), so this is no big surprise.
Yes, of course that would be it! Thank you!