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Mean Chord: The total area of an aerofoil divided by the span.
Medium Clouds: Average height between 8,000ft and 20,000ft. They are: (a) Alto-cumulus. A layer of small masses of cloud arranged in groups, lines or rolls. (b) Alto-stratus.
And incidentally, the mean chord of a wing is span/aspect ratio. A high performance sailplane wing, designed for minimum induced drag over the CL range, might have a wingspan of 22 m and an aspect ratio of 30 thus a mean chord of 0.7 m.
 See also: Attitude, Altitude, Maintain, Glider, Torque
  
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