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I have never seen vortex generators on anything but GA planes (not that I have access to many faster planes). Do they use them on many fast planes?
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Sure, (again sorry for not being commercial jet literate) but I have been on a large transport category acft A-300 or MD-80 type that have had VGs right down the wing. I am not so sure the speed is the issue with VGs like it is with BLEs, but it does give you a larger window for useful airspeed. (dropping the VSO raising the MMO,