NAVWEPS DD-BOT-80  BASIC AERODYNAMICS  CAMBERED AIRFOIL  UPPER DEVELOPING POSITIVE  LIFT  NET  LIFT  LOWER SURFACE LIFT  SYMMETRICAL AIRFOIL  AT ZERO LIFT  CAMBERED AIRFOIL  AT ZERO LIFT  UPPER SURFACE  LOWER SURFACE  LIFT  SYMMETRICAL AIRFOIL  AT POSITIVE LIFT  UPPER SURFACE LIFT  LOWER SURFACE LIFT  t  CHANGE IN LIFT  +  O.C.  A-  UPPER SURFACE  FLOWER SURFACE LIFT  CAMBERED AIRFOIL  AT POSITIVE LIFT  A-  UPPER SURFACE LIFT  LOWER SURFACE LIFT  k-  CHANGE IN LIFT  c  +  PITCHING MOMENT  0.e.  Figure 1.27. Development of Pitching Moments  48 