 A "reverse" version of this, utilizing wing-warping, existed on the later version of the Santos-Dumont "Demoiselle", which only warped the wingtips "downward".One of the disadvantages of this setup was a greater tendency to yaw than even with basic interconnected ailerons.During the 1930s a number of light aircraft used single acting controls but used springs to return the ailerons to their neutral positions when the stick was released.