Quote:
Originally Posted by Cd
So what is the real purpose ?
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Noise reduction.
Boeing: Boeing, Rolls-Royce Verify Jet Noise Reductions
The technology behind serrated trailing edge design is described in US patent 6612106 filed by Boeing in 2001.
Segmented mixing device having chevrons for exhaust noise reduction in jet engines - Patent 6612106
I wouldn't be surprised if they also reduced wake drag.