Propellers (IMAGE) University of Cincinnati Caption University of Cincinnati aerospace engineering professor Daniel Cuppoletti uses an anechoic chamber covered in sound-absorbing panels to study engine and propeller noise in drones and flying cars. Credit Andrew Higley/UC Creative Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.