Modern subsonic aircraft have been refined
to such an extent that 75% of the parasite drag (portion of total aircraft drag
not directly associated with producing lift) can be attributed to friction
along the external surfaces. For a typical subsonic jet, the parasite drag
coefficient based on wing area is 0.011. Determine the friction drag on such an
a. at 500 mph at 35 000 ft;
b. at 200 mph at sea level.
The wing area is 2400 ft2.
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