An Army Air Forces engineer examines a B-17 model undergoing wind tunnel testing. The wind tunnel staff is experienced in all forms of force, pressure, flight control, vibratory, and dynamic testing of powered and unpowered fixed- and rotary-wing aircraft and other test articles in and out of ground effect.Source :
National Archives and Records Administration 342-C-K-4195
Smithsonian National Air and Space Museum
https://www.boeing.com/company/key-orgs/boeing-testing-services/wind-tunnels-and-propulsion.page
https://www.flickr.com/photos/airandspace/albums/72157715574200936
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