A version of this article appears in the September 22 issue of Aviation Week & Space Technology. How do you improve the fuel economy of aircraft that have been in service for years, or decades? Reengining is expensive and unlikely to pay off within the lifetime of older airframes. Modifications to fit winglets can be costly and the return on investment may not come quickly enough. The U.S. Air Force Research Laboratory (AFRL) is looking for other, less invasive solutions to reducing the ...

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