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A flying wing has a planform area of 3700 ft2, a root chord at the airplane...

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Mechanical Engineering

A flying wing has a planform area of 3700 ft2, a rootchord at the airplane centerline of 34 ft, an overall taper ratioof 0.275, and a span of 170 ft. The average weighted airfoilthickness ratio is 10.2% and the wing has 36 degrees of sweepbackat the 25% chordline. The air- plane is cruising at a pressurealtitude of 17,000 ft on a standard day with a wing loading of 40lb/ft2. The cruise Mach number is 0.30. Determine thefollowing:

(a) skin-friction drag coefficient (assume a spray-paintedsurface)

(b) pressure drag coefficient

(c) induced drag coefficient

(d) total drag coefficient

(e) total drag in pounds

Remember that a wing has both upper and lower surfaces exposedto the flow. Use the appropriate skin friction coefficient equation(Chp 4) that would include transition from laminar to turbulent;assume Re,trans = 500,000. If the surface is fully-rough, thenconsult 5.20 on pg 266. Form drag is based on the fineness ratiocharts. The Oswald efficiency factor is high for wings—assume e =0.95.

Answer & Explanation Solved by verified expert
4.2 Ratings (842 Votes)
ASkinfriction drag coefficientFCfxAxV22F00596x760x3700F269952poundsSkinfriction drag    See Answer
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