Optimum Angle: (1) The gliding angle at which the least height is lost in proportion to the ground covered. (2) The angle of attack of an aerofoil at which the ratio of lift to drag is greatest.
The stalling speed increases (because the stalling angle of attack stays the same), and the airspeed for best rate of climb increases (because the optimum angle of attack stays the same), ...
 See also: Panel, Runway, Power, Plane, Derate
  
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