Best Gliding Angle. That gliding angle at which an aerodyne will cover a maximum horizontal distance for a given loss of height.
that is, when the speed is 57 miles per hour. At any other speed the resistance increases and hence the gliding angle decreases. Hence the importance of putting the airplane into its proper speed in order to secure the best gliding angle.
See also: Propeller, Wind, Glide, Landing, Power
 
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