Question: In calculating the drag force on a wing, we might consider it as two flat plates for the upper and lower surfaces plus a half-cylinder on the leading edge. Estimate the drag force for a wing approximately 5 inches thick, 30 ft long and 6 feet wide traveling at 500 ft/s in air at 32°F. Data for air at 32OF, 1 atm: p = 0.081 lbm/ft3; p = 0.023 cP.