Question: The NSU Delphin III streamliner motorcycle set the motorcycle land speed record in what year, the engine used an unusual rotary supercharger related to NSU's eventual development of the Wankel engine is a type of internal combustion engine using an eccentric rotary design to convert pressure into rotating motion?
Sentence (from "NSU Delphin III"): Its fairing, designed in a wind tunnel at University of Stuttgart (then Stuttgart Technical College), gave it a drag coefficient of 0.19.
Relevant evidence: No