The American Wil Schuemann pioneered several performance-enhancing modifications to the type, including a re-profiled wing, converting the airfoil to a Wortmann section, various fairings, a new canopy and a reshaped fuselage nose.
Wil Schuemann, an American innovator, introduced modifications to enhance performance, such as re-shaping the wing, changing the airfoil to a Wortmann section, improving fairings, introducing a new canopy, and altering the front of the fuselage. These changes were aimed at boosting efficiency.