Which mechanism is described as being used to warp wings midflight?

• A. Pulley system
• B. Wind tunnel
• C. Brain removal
• D. Medical reputation

Answer: (A)

Wing warping is a way to control the aircraft’s roll by twisting the wings themselves, rather than using separate flaps on the trailing edge. The mechanism that made this possible in early airplanes was a pulley-and-cable system. When the pilot moved the control, cables running along the wings through pulleys pulled opposite wing tips in opposite directions. That twisting changed the lift on each wing, causing the plane to roll in flight. This approach was famously used by the Wright brothers before ailerons became standard.

A wind tunnel is a tool for testing aerodynamics and models, not for in-flight wing twisting. The other two options don’t apply to wing control in flight.