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Originally Posted by freebeard
Another counterexample is the GM EV1. It has a too-fast fastback and too-good numbers.
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I have posted that car more than once. May have been told yes it works but works even better following the template. However final wind tunnel testing trumps any theory. End of what I recall being told.
Back in 2013 when the "Scaling the Template" thread was active I believe Aerohead provided the explanation that the Aerotemplate was a starting point and not a final destination.
https://ecomodder.com/forum/showthre...ate-25975.html
Also he gave great leeway to wind tunnel testing for final results over that of concept, theory and template use.
I was never 100 percent happy with "follow this template strictly until wind tunnel proves otherwise" approach because I do not have a wind tunnel and still wanted explanation for real world departures from the aero-template.
Julian is offering an explanation (air pressure) to go with a process. This is an exciting thing to explore, but as usual I am reluctant to be a cult follower, even if it's a really cool cult that makes sense on the surface.
However, both Aerohead/Phil and Julian seem willing to surrender to testing results to justify and critique actual designs.
This common ground is where we can agree, and yet disagree on how it became so and how it works or does not work.
Going back to 2010-2013, I think that I was told the ground pressure plane skews attachment from those of free air shapes found in the sky (aircraft). Resulting in longer bodies (longer slopes) near the ground than in free flowing air or body moving in free air to be more exact.
Another thing said over and over again in this forum over the years is that tuft attachment does NOT always mean good low drag airflow above. The many reasons why have seemed reasonable to me when patiently explained by Phil/Aerohead and others.
Post #42 - hot topic indeed.
https://ecomodder.com/forum/showthre...y-25809-5.html
Post #45 one of my better things said.
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When you scale down the template, you scale down your success.
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