How does wing aspect ratio influence induced drag and stall behavior?

• A. Higher aspect ratio increases induced drag and raises stall speed.
• B. Higher aspect ratio reduces induced drag and generally lowers stall speed, improving cruise efficiency.
• C. Aspect ratio has no effect on drag or stall behavior.
• D. Higher aspect ratio reduces wing loading but increases stall risk.

Answer: (B)

Aspect ratio is a measure of how spanwise the wing is compared with its area. When the wing has a higher aspect ratio, lift is produced with less wingtip vortex energy, because the lift distribution over a longer span reduces the strength of those vortices. This directly lowers induced drag, which is the portion of drag tied to generating lift. So, for the same weight and flight condition, a higher aspect ratio wing yields a better lift-to-drag ratio, improving cruise efficiency.

Stall behavior is influenced by how lift is distributed across the wing and how the wing reaches its maximum lift. A higher aspect ratio wing tends to maintain a more favorable lift distribution and can delay abrupt stall progression, which often translates to a lower stall speed in practical design terms. (Remember, stall speed itself depends on weight, wing area, and the maximum lift coefficient, but higher aspect ratio generally supports safer, gentler stall characteristics and lower indicated stall speeds in typical configurations.)