Blow hard
Inside the diffuser section of the16-foot supersonic wind tunnel at Arnold Air Force Base, Tenn., Dr. Richard Roberts checks out the turbine blades during a site visit Oct. 6, 2009. Dr. Roberts is the project manager of the von Karman Gas Dynamics Facility and the Propulsion Wind Tunnel Facility located at Arnold Engineering Development Center on Arnold AFB. (U.S. Air Force photo/Lance Cheung)
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