It looks like it's got a lot of taper in plan, and the lower nose seems to be handled well; but yeah, that's not a number.
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If you'd like to depart from the 'Template,' you might want to find out all you can about Wolfgang Klemperer's 'minivan' of Cd 0.16 (in naked model form) which he tested in 1921...This 'minivan' is what VW used as the basis for the VW 2000 concept car.
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I'm familiar with the VW Auto 2000 concept; but I'm not finding much on Klemperer. I searched on combinations of 'Wolfgang Klemperer 1921 windkanal minivan', etc. Google points to page 25 of the Aerodynamic Streamlining—Part C thread but the trail goes cold there.
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If you weren't interested in going below Cd 0.16 it would be a good way to go.
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I'm stumped, I can't decide if I am interested in sub-0.16 territory. While I'm dithering, how valid do you think the reported Cd of 0.17 is for the Volkhart-Sagitta: