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Originally Posted by Gargamel
and I've been binging a bit on aircraft videos of late (The ATC ones with subtitles are my current fetish)
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I knew you people were out there!
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I understand the upper winglet keeps the airflow on the lifting surface, making the entire wing vastly more effecient, but I'm not clear on what the lower one does.
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More or less the same function, preventing and then delaying airflow separation and acting as a lightweight wingspan extension. Both of which give you a boost.