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From: "terrence o'neill" <troneill@charter.net>
Subject: Re: [LML] wing incidence indifference
Also, are you assuming the relative wind at the tip and the root are the
same as at MAC, and not affected by planform, etc.?
If the subject is unintentional stalls -- resulting from gusts -- and
inferring that the incidence difference might result in a spin, should we
consider also the other characteristics of the configuration, such as CG,
horizontal tail volume and its own AOA, cleanness of airflow over the
vertical tail, and the direction of the airflow across or UP the rudder?
T
saluto T,
The relative wind is the sum of, the vector of the gust and the forward
velocity of the aeroplane, and the angle of the respective chord line to the
free stream velocity. With the correct wing washout of 2 degrees the wing
root works at a higher AoA to the relative wind than the tip and is intended
to stall first, the stall developing symmetrically and extending
symmetrically to the wing tips with increasing AoA.
Planform, CG, horizontal tail volume and AoA etc are characteristics which
affect the aeroplane's response to the gust. If you want to get really
technical , AoA affects upwash, so does use of aileron, and lets not forget
Reynold's numbers....etc.
Incidence and washout difference between the wings can result in asymmetric
lift with powerful forces as I hope I illustrated.
ciao,
Roberto d'Italia.
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