Glider Tail Stall
On Feb 20, 10:15*am, jcarlyle wrote:
According to the videos, if the tail stalls you need to recover by
pulling back on the stick, not pushing forward on the stick as we
usually do.
I hate to risk adding to the obvious confususion but....
The NASA video deals with a specific case where a contamined tail
results in a uncommanded sudden downward motion of the elevator, which
in turn results in a forward stick motion, and a nose down pitch.
The situation would appear to be completely different from an
aerodynamic stall of an uncontaminated tail surface.
The use of the term "tail stall" for the icing induced pitch down
seems misleading to me since the tailplane could not be at critical
angle of attack if returning the elevator to its pre-displaced
position restores the downward tail force.
A significant difference between the two scenarios is the stick
motion associated with the event. Iced up tail - nose pitches down
as stick moves forward. Aerodynamic tail stall - nose pitches down
as stick moves aft or stay where it was.
Linking to the thread on stall awareness and recovery, the iced tail
situation that results in down elevator and uncommanded forward stick
motion may be hard to distinguish from a stick pusher event, and the
required recovery for these is exactly opposite.
Andy
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