Quote:
Originally Posted by ME_Andy
2:10 : you're right, the template doesn't predict where the flow detaches to a high degree of accuracy. It's maybe 20cm off or so. Big whoop. Nobody claimed the template was perfect, it's an approximation. The original description even says, it should be useful for amateurs.
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The "template" has been used here for more than decade now to predict flow separation. Take a look at
this thread about the 2010 Prius; in it, a bunch of posters theorize about flow detachment on the roof and rear window based on comparison to the "template". And not a one bothered to go out, tape some tufts to the car, drive it and look at them. Instead, they predicted flow separation (where, incidentally, none exists--which I know because I went out, taped some tufts to my Prius, drove it, and looked at them).
For a more recent example, look at the Honda CR-Z build thread. In that one, a poster writes about his efforts to obtain a high-resolution profile photo so he can "analyze" the car aerodynamically--presumably by comparison to the "template" (as if it is possible to "analyze" a car aerodynamically simply by looking at a picture of it).
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I don't understand the pushback here. Whenever Julian has recommended a book, I've bought and read it. I bought the (inexpensive) testing equipment he has posted about. I've started measuring things myself; I don't have to take his word or any author's word for it. I've learned a great deal in the process, but most of all it has opened up a whole world of what I
don't know.
What are you all afraid of? Are you afraid your previous beliefs about aerodynamics will have to be rethought? Do you think you'll "regret" learning something new, as someone threatened in another thread (under different circumstances, but the sentiment is what I'm getting at)? Or is it just that the idea that the field of vehicle aerodynamics is actually simple (an idea which appears to be so far from the truth as to be laughable), which has been promulgated on this site for more than a decade, is now so entrenched that you all truly believe it and no contrary evidence will be tolerated let alone investigated? What is it?