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Four Engine USB Model in the 40x80 foot Wind Tunnel. Large-Scale Upper-Surface Blowing Model using JT15D Engines. Test #441, June 18th, 1974. Original from NASA. Digitally enhanced by rawpixel.

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Four Engine USB Model in the 40x80 foot Wind Tunnel. Large-Scale Upper-Surface Blowing Model using JT15D Engines. Test #441, June 18th, 1974. Original from NASA. Digitally enhanced by rawpixel.

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