RoboSwift Wing Shapes (IMAGE) Delft University of Technology Caption RoboSwift can sweep its wings back and forth, changing the shape and the surface area. By doing so the airplane can fly more efficiently and more agilely than fixed-wing aircraft. The airplane is powered by means of a special propeller that folds during gliding to minimize air drag. Credit RoboSwift team Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.