How do winglets at the wingtips primarily affect aircraft performance?

How do winglets at the wingtips primarily affect aircraft performance?

• A. Increase the lift-to-drag ratio
• B. Decrease the stall speed
• C. Increase the stall speed
• D. Reduce wing span

Answer: (A)

Winglets reduce the energy lost to wingtip vortices. Those vortices create induced drag, especially at higher angles of attack and in cruise flight. By curving the airflow at the wingtips, winglets weaken these vortices, so the wing can generate the same lift with less drag. That means the lift-to-drag ratio improves, boosting overall efficiency, range, and fuel use. Stall speed isn’t significantly affected because stall depends mainly on weight, wing area, air density, and the maximum lift coefficient—factors that winglets don’t meaningfully change. They also don’t reduce wing span; if anything, they slightly extend the effective span.

Winglets reduce the energy lost to wingtip vortices. Those vortices create induced drag, especially at higher angles of attack and in cruise flight. By curving the airflow at the wingtips, winglets weaken these vortices, so the wing can generate the same lift with less drag. That means the lift-to-drag ratio improves, boosting overall efficiency, range, and fuel use.

Stall speed isn’t significantly affected because stall depends mainly on weight, wing area, air density, and the maximum lift coefficient—factors that winglets don’t meaningfully change. They also don’t reduce wing span; if anything, they slightly extend the effective span.