GENERAL KNOWLEDGE

Detailed explanation-1: -Designed as small airfoils, winglets reduce the aerodynamic drag associated with vortices that develop at the wingtips as the airplane moves through the air. By reducing wingtip drag, fuel consumption goes down and range is extended.

Detailed explanation-2: -The use of winglets leads to a splitting of the tip vortex. The vortex is displaced and reappears in a smaller form at the winglet tip. The smaller vortex has a lower rotational speed and less kinetic energy and thus a reduction of the induced drag.

Detailed explanation-3: -The winglets increase the spread of the vortices along the TE, creating more lift at the wingtips (figs. 2 and 3). The result is a reduction in induced drag (fig.

Detailed explanation-4: -Increasing the airspeed will increase the lift. Increasing the camber will increase the lift. A symmetric airfoil, or even a flat plate at angle of attack, will generate lift.