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 pioneer, introduced numerous enhancements to the design, such as a redesigned wing profiled with a Wortmann section, improved fairings, a new canopy, and a re-shaped front of the fuselage. These modifications aimed to boost performance.