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Old November 9th 04, 03:54 AM
Andrew Sarangan
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That is exatly what I said in a previous post on this thread. A bank causes
an airplane to side-slip, which in turn makes it point into the wind.



soxinbox wrote in
. 165:

I don't think anyone has hit on what is really going on here. The
explanations about the sideways force created by lift when the AC is
banked cause it to move ( accelerate ) to the side, but not rotate.
The dihedral wing explanation doesn't work either, because the raised
wing's horizontal force is applied aft of the CG, thus causing
rotation in the opposite direction of the turn. The major reason that
a plane rotates about the vertical axis during a turn is wind vaning.

You bank the plane, the lift is broken into horizontal and vertical
components. The horizontal force causes the plane to accelerate to the
side, but not rotate as others have stated. Now with the plane picking
up speed in the lateral direction, the relative wind is now coming
from one side of the plane, a forward quartering headwind! As anyone
who has taxied on a windy day knows, planes have a natural tendency to
face into the wind. This is caused by the big wind vane we call a
tail. This rotates the plane into the wind. The relative wind is thus
always leading the plane by a few degrees, causing a continued
rotation. And as a side benefit, the horizontal acceleration is
countered by the centripetal force of the turn, so we don't continue
to accelerate to faster and faster horizontal speeds.



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