FlexFoil is a shape-changing assembly that replaces the flaps on a wing and can alter shape in flight to produce seamless bendable and twistable aerofoil surfaces. This allows the FlexFoil to act like a flap in its various positions while still providing an unbroken air surface. This makes for a more streamlined wing and reduces noise during takeoffs and landings. Importantly, it’s designed not only for new aircraft designs, but for retrofitting to existing ones.

via NASA tests aircraft with shape shifting wings.