A Flying Wing has a swept symmetric airfoil with a planform area of 3700 sq ft,

Question

A Flying Wing has a swept symmetric airfoil with a planform area of 3700 sq ft, a root

cord at the airplane centerline of 34 ft, an overall taper ratio of 0.275, and a span of 170
ft. The average weighted airfoil thickness ratio is 10.2% and the wing has 36 degrees
of sweepback at the 25% cord line. The airplane is cruising at M=0.23 with an angle of
attack of 5 degrees, at a pressure altitude of 17,000 ft on a standard day, with a wing
loading of 105 lbf/sq ft. For these conditions, determine the following:
a. parasite drag coefficient
b. lift coefficient (remember W/S= wing loading)
c. induced drag coefficient (assume e=.9)
d. total drag coefficient (Sref = Sexp for Flying Wing)
e. calculate the total drag

Explanation / Answer

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