Question Statement:
A second identical airfoil is placed behind the first one at a distance of c/2 from the trailing edge of
the first. The second airfoil has an unknown circulation 2 placed at its quarter chord. The normal
velocity becomes zero at the same chord-wise locations of the respective airfoils as in the previous
question. The values of 1 and 2 are respectively
(A)
42 ,33 cU cU (B)
22 ,33 cU cU
(C)
21 ,33 cU cU (D)
44 ,33 cU cU
2013 AEROSPACE ENGINEERING - AE
AE 17/19
Statement for Linked Answer Questions 54 and 55: A wing-body alone configuration airplane with a
wing loading of 21000 /W N mS is flying in cruise condition at a speed V = 90m/s at sea-level (air density
at sea-level 31.22 /kg m ). The zero lift pitching moment coefficient of the airplane is
0 0.06wb
mac mCC and the location of airplane aerodynamic center from the wing leading edge is
0.25 .acXc Here c is the chord length.