What is ground effect Describe how ground effect can have ei

What is \"ground effect\"? Describe how ground effect can have either a positive or negative effect on the lift coefficient.

Solution

ground effect : ground effect is the increased lift (force) and decreased aerodynamic drag that an aircraft\'s wings generate when they are close to a fixed surface.

When an aircraft flies at a ground level approximately at or below the length of the aircraft\'s wingspan or helicopter\'s rotor diameter, there occurs, depending on airfoil and aircraft design, an often noticeable ground effect. This is caused primarily by the ground interrupting the wingtip vortices and downwash behind the wing. When a wing is flown very close to the ground, wingtip vortices are unable to form effectively due to the obstruction of the ground. The result is lower induced drag, which increases the speed and lift of the aircraft.