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Approaching Deep Stall



 
 
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Old September 5th 07, 07:29 PM posted to rec.aviation.piloting
Fred the Red Shirt
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Posts: 180
Default Approaching Deep Stall

For a while I have been wondering why there seem to be no
airplanes with a low wing and a high tail. Say for instance
with a fuselage and epenage like the Zodiac 701, but with
a low wing instead of the high wing. Then I read about deep
stall, as illustrated he

http://www.answers.com/topic/deep-stall-png

Here deep stall is defined as a condition in which the
main wing is stalled and the stabilizer is enveloped
in the turbulent wake of the stalled wing so that
the pilot has lost pitch control and thus cannot lower
the nose to recover. For certain airframe geometries,
(such as the illustration above) that condition can
occur even if the aircraft is within the proper CG limits.

My question regards the orientation that immediately
precedes the deep stall. If the angle of attack at stall
is exactly the same as the angle that puts the stabilizer
in the shadow of the wing, that will precipitate a deep
stall, right?

What if the wing stalls at a lower AOA? Would the
stabilizer then drop into the wake?

ISTM that if the AOA that stalls the wing is higher than
the AOA that puts the stabilizer in the wake of the wing
then that aircraft is immune to this sort of deep stall,
so long as it is flying within the CG limits, right?

--

FF

 




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