Quote:
Originally Posted by JulianEdgar
This forum is called Ecomodder.
Modifications to cars. So we're interested in what will achieve good results on our cars.
Now that the template has been proved to be largely invalid in doing that, you move the goalposts to now this site being about developing ultra-low drag cars from scratch. If we were in fact doing that, I think all five(!) low drag shapes that have been published in the literature would make good starting points.
But as far as I know, that's not what we're doing here.
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Correct me if I'm mistaken, however, all I've seen so far, are uncorroborated statements, with no empirical, laboratory evidence. And quite the contrary.
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As to the Volkswagen 'templates', let's discuss those:
* The VW-Blunt Body ( solid-border rendering ) is a 'Go!. It is the AST-II form. And at Cd 0.15, it has the potential for lower drag with elongation, perhaps Cd 0.14.So thanks for the it's recommendation!
* The VW-Blunt Body ( dashed-line bordered rendering ) is the 1922, Wolfgang Klemperer, 'minivan' basic body. And a great mystery shape, as it's Cd doesn't change between 1922 and 1981. If you could see out of it, it would be a miracle! Perhaps in the future, with synthetic vision, as IHPV land speed record bicycle are using, it wouldn't be an issue. So I excluded it as a candidate for us here at EcoModder.
* The VW-Drop Shape is also a fail with respect to forwards outward visibility. Reason I don't endorse its use. It's also already 100% boat-tailed, with zero-opportunity for lower drag beyond Cd 0.16.
* The VW-Flow-Body is a 'Go', as it's essentially a 'template' form, with 23-degrees instead of 22.5-degrees rear slope maximum. And with Cd 0.15 as a truncated form, and Cd 0.14 as a 'long-tail, it's a perfect candidate for the extensible boat-tail. It also has the facility for perfect forwards outward vision. Thanks again for the thumbs-up!
* The AVA Streamline Shape, is, of course, the 1938 Schl'o'rwagen, by Ludwig Prandtl. Cd 0.186. It has perfect forwards outward vision. It is, unfortunately, already Verjungungsverhaltnis- limited, at Cd 0.186, so there's no potential for lower drag. Why I cannot endorse it either.