The most critical geometric parameters of winglets in drag reduction efficiency were summarized. Then the numerical simulation method was utilized to reveal the optimal range of these parameters

which is the theoretical basis of morphing winglet design. The advantages and disadvantages of morphing winglets in aerodynamic performance

aerodynamic load distribution and wingtip vortices were discussed compared with traditional winglets. The results show that morphing winglets can increase the drag reduction efficiency by 2.2% compared with traditional winglets and weaken the wingtip vortices by 15% in the takeoff phase of flight. It is beneficial to enhance the fuel efficiency of aircraft and the airport spatial security. However

morphing winglets increase the bending moment at the wing root. For this reason

aircraft designers have to strik a balance between the aerodynamic benefits and the structural disadvantages in morphing winglet designs.