If the wing is replaced by a II-shaped horseshoe vortex line, the span length of the attached
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If the wing is replaced by a II-shaped horseshoe vortex line, the span length of the attached vortex is L, as shown in Fig. 6.6 of the exercises, try to prove
(1) The downwash angle at position a after the attached vortex at the middle of the wing is 
where 
is the lift coefficient and λ is the aspect ratio.
(2) If the airfoil has 
assuming that the aspect ratio correction adopts the correction of the elliptical wing, the rate of change of the downwash angle at a position the back of the middle wing to the angle of attack is
And calculate the value of 
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