Figure 2.27. Endurance  Performance  171  NAV ’ iiEPS Oo-801-80  AIRPLANE PERFORMANCE  EFFECT OF ALTlTUOE ON MINIMUM  POWER REO’D  b  AT ALTITUDE  SEA.LEVEL  /  /  MINIMUM  /  /  /  CONSTANT  WEIGHT 8  CONFIGURATION  lm-  VELOCITY, KNOTS  EFFECT OF ALTITUDE ON MINIMUM  t  THRUST REO ’ D  SEA LEVEL  AT ALTITUDE  T;;;g  MINIMUM THRUST REO ’ D  LBS  /’  A’  ,’  CONSTANT  --  WEIGHT 8  I  VELOCITY, KNOTS 