On Sun 12 Mar, Y.K.Chan wrote:
> There are more than one way/combinations to support such
> observation of his. I agree that not enough nose weight can
> caused that, although he stressed that CG at 35% cord (from LE I
> guess, or it is from TE? worth questioning does it?) I guess I
> should not use the term AOA when I think of angle formed by zero
> lift reference to fuse-axis, geometry elevation angle GEA. An
> excessive GEA can also support his observation, and that was my
> point. Like you said, a fully moving stab is the answer to that
> although the fuse axis may form too large angle to the wash.
AOA is never visavi the fuselage - depending on which speed
minimum drag is most important, while thermalling or on the speed
runs, the rigging angle varies a bit between different aircraft -
unless you use a pivoted wing, it isn't perfect for more than
one speed - whatever angle you choose!
> Further more, does he understand what is zero lift reference,
> decalage and their relationship? or did he mean decalage is
> measure relative to fuse axis or a line drawn between centers of
> F-wing and stab. I don't we have any disagreement among what we
> understand in aerodynamics, but the interpretation of his
> observations and yet if the observer knows enough to present a
> real situation in front to the audience? Do you agree? YK
Have no idea :-)! I hope he knows :-)!
Tord,
Sweden
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