Pmdg 737 fsx lower winglet10/7/2023 They are also available as a retrofit from APB. They are now available as a standard production line option for all NGs with the exception of the -600 series. They were first flown on a 737-800 in June 1998 as a testbed for use on the BBJ. They have been credited to Dr Louis Gratzer formerly Chief of Aerodynamics at Boeing and now with Aviation Partners Boeing (APB) but the original winglet design was by NASA Langley aeronautical engineer Richard Whitcomb during the 1973 oil crisis. These are wing tip extensions which reduce lift induced drag and provide some extra lift. The most noticeable feature to appear on 737s since 2000 are winglets.
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