The B787 has these chevron-shaped teeth on the exhaust port of its engines to reduce noise.
And according to the answer to this question they will be incorporated into the new B737's
Can anyone explain how these work to reduce noise?
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1Ah, thanks. It's a dupe. Can the [tag:noise] tag be added to the original. I didn't find it. – TomMcW Aug 10 '15 at 16:00