 During his time at the university, he also participated in experiments under the aegis of the Aerodynamische Versuchsanstalt (AVA), the German counterpart to the American National Advisory Committee for Aeronautics.In 1937, Multhopp was placed in charge of one of AVA's wind tunnels.More importantly he had already published a seminal paper on wing-lift theory  and before he had fulfilled his doctoral requirements, his work had attracted the interest of other German aviation concerns.