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Old 10th February 2008 | 22:10
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FCS Explorer
 
Joined: Nov 2005
Posts: 342
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From: right here
http://en.wikipedia.org/wiki/Raked_w...#Raked_wingtip

...In testing by Boeing and NASA, raked wingtips have been shown to reduce drag by as much as 5.5%, as opposed to improvements of 3.5% to 4.5% from conventional winglets...
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