Pratt &amp;​ Whitney Advanced Ducted Propulsor (ADP) engine test in 40x80ft wind tunnel: Engineers Peter Zell (left) and Dr Clifton Horne (right) are shown preparing a laser light sheet for a flow visualization test. Shown standing in the nacelle of the ADP is John Girvin, senior test engineer for Pratt &amp;​ Whitney.
NASA
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