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A Learjet 24 and an Air Force T-37 meet in the skies over NASA Dryden for a series of flights to study the hazards of wake vortex generated by large aircraft. Studies conducted from the late 1960s to 1974 used large aircraft as wake generators and smaller instrumented aircraft such as the Learjet and T-37 were flown into the vortices to determine vortex strength and safe separation distances. The 747 is the same one acquired by NASA and later modified to carry space shuttles.

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Spectacular document"

[https://www.flickr.com/photos/112405360@N03] No further information was given on photo about location. Sorry