Two engineers place foam wedges inside anechoic chamber. Two Raspet employees pose outside anechoic chamber. Man standing out side anechoic chamber. A Raspet engineer grasps a propeller while standing inside an anechoic chamber. UAS engine sits on stand while man fixes wall foam behind it. A man grasps a propeller mounted on test stand inside anechoic chamber. A propeller mounted on a test stand inside anechoic chamber. Two people work on laptops outside anechoic chamber. one man adjust a engine on a stand while another man works on foam on a wall. one man adjust a engine on a stand while another man watches. two people stand around one man while he explains some thing on a laptop. two people stand around one man while he explains some thing on a laptop. A propeller mounted on test stand inside anechoic chamber. A graduate research assistant stands in doorway of anechoic chamber.
