Approaching Deep Stall

On Sep 6, 3:16 am, DR wrote:
Fred the Red Shirt wrote:



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.

Err, that's not how I see it,

The aircraft can/will still pitch down after stall for 2 reasons: First,
the center of wing lift moves aft once the wing is stalled which will
drop the nose. Second, the tail is pushing the nose up to increase angle
of attack so that once blanketed the nose drops.

The conditions that DEFINE Deep Stall cause a loss
of lift at tail as well, though the tail is not necessarily
stalled in the same sense as the main wing.


As far as I understand it, all certificated aircraft must be able to
recover from a basic stall.

My 2c


Deep Stall is not a basic stall. See the description
above, or the previously referenced webpage.

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FF