Louis Gratzer Dies, Invented Blended Winglets

June 09, 2014
Inventor of the blended winglets flying on more than 6,000 business jets and Boeing airliners, aerodynamicist Louis “Bernie” Gratzer died at home near Seattle on May 31. He was 93. He was a senior vice president at Aviation Partners, which he joined after a career at Boeing, where he was a major...

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