Vivian Meazza wrote:
> Whilst working on the DC3 model, trying to help a little with this
> problem, I noted that the model flies left-wing low. This seems to
> be related to the twist element set on the wing. The DC3 has -3 deg
> set. Reverse this and the model flies wings right wing low. It seems
> as if the twist applies across the whole wing rather than being
> reversed for half the wing. It won't run at all with twist = 0. Is
> this a bug or a feature?
Indeed, the twist assignment for wings looks a little wrong. These
are the twist assignments for the symmetrical left and right wing
segments:
s->setTwist(_twist * frac);
s->setTwist(_twist * Math::sqrt(frac));
This is almost certainly a mistake; I took the sqrt() call out and
committed a symmetric right-side twist to CVS. David, this was your
code originally, right? Is that your intent, or should I have put a
sqrt() into the left side?
Andy
Index: Wing.cpp
===================================================================
RCS file: /var/cvs/FlightGear-0.9/source/src/FDM/YASim/Wing.cpp,v
retrieving revision 1.4
diff -u -r1.4 Wing.cpp
--- Wing.cpp 18 Feb 2003 17:37:28 -0000 1.4
+++ Wing.cpp 9 Feb 2004 15:11:32 -0000
@@ -360,7 +360,7 @@
sr->surface = s;
sr->weight = chord * segWid;
s->setTotalDrag(sr->weight);
- s->setTwist(_twist * Math::sqrt(frac));
+ s->setTwist(_twist * frac);
_surfs.add(sr);
}
}
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