John Wojnaroski writes:
> Do the FDMs account for the fact that the down aileron creates more
> drag than the up aileron thereby creating a yawing moment about the
> z-axis?
For JSBSim, take a look at $FG_ROOT/Aircraft/c172/c172.xml:
<COEFFICIENT NAME="Cnda" TYPE="VALUE">
Yaw_moment_due_to_aileron
FG_QBAR|FG_WINGAREA|FG_WINGSPAN|FG_AILERON_POS
0.0053
</COEFFICIENT>
It could be that that value is too small -- for a C182, Roskam gives a
value about four times as big:
Cnda = -0.0216
Personally, in my experience so far in a C172P I haven't noticed
adverse yaw much at all in level turns at cruise power (2200RPM) and
<20deg bank -- I put my foot on the rudder pedal to keep the
instructor happy, but the ball doesn't move much either way. A
full-power climbing turn is another story, of course.
All the best,
David
--
David Megginson
[EMAIL PROTECTED]
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