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I hesitate to get into this quickly degrading thread, but as an engineer myself if an engineer doesn’t understand the math, science, formulas, and constraints behind any product they are utilizing, I question their abilities as an engineer. You will not last long in most industries quoting “rules of thumb” without being able to fully explain how and why. The handful of “engineers” (and I use that term loosely) that somehow exist just glazing over data and making broad generalizations are the reason most hardworking blue collar employees hold disdain for engineers. And frankly I don’t blame them and share in their disdain towards certain individuals. Those “engineers” should find another career path.
It doesn't matter to me whether vortex generator's induced vorticies net reduce your drag coefficient times area figure or not, I have no skin in the game either way. But in my opinion papers with improper testing methodology are worse than no paper at all, regardless of the subject area.
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