CPL Aerodynamics · Practice

Double-slotted Fowler flaps are more effective than plain trailing-edge flaps because:

• A.they reduce induced drag during the approach by redistributing the spanwise lift gradient
• B.The slot energises the boundary layer and the rearward movement increases wing area and camber
• C.they increase the geometric dihedral angle of the wing automatically at full deployment
• D.they are lighter and structurally simpler to manufacture than plain trailing-edge flaps