Hi, Don. IM(very)HO, the vortex generators have not gone anywhere because of the perception that they would cut down on top speed. The main reason a lot of persons buy/fly airplanes is because of the fast travel they purportedly have (but see my future post anon). To stick a bunch of velocity-robbing, draggy dudes on the top of the wing, or any where else for that matter, is therefore dumb. But maybe VGs help in the low speed regeme - by keeping the air attached to the top surface of the wing. So - if one is not into getting there fast, and would rather have the low speed control, then VGs may be a way to go. I am not an aeronautical engineer, and I do not play one on TV...
Percy in Portland
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