Before the heavy-weights weigh in here, here's my guess: both explanations
are correct, but the tail has the greater effect. As the plane enters
lifting air, both the wing and the tail experience an increase in AOA
(relative to airflow). The wing itself will tend to correct (nose down) to
return to its preferred AOA, but since the tail has more of an effect on
pitch (being way out there on the lever arm), as it is deflected up by its
increased AOA (i.e., TE is lower), it will contribute more to lowering the
nose.
Would this effect occur in a plank (no sweep) flying wing?
David
Berkeley CA USA
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