Quote:
Originally Posted by AeroMcAeroFace
So there are different templates, and the AST-II is the one to use? Why have people been encouraged to use a different one for the past 10 years?
Does this solve the PRIUS debate? Does that fit the different template? If it does then maybe the template is usable, but on the centreline where flow is front to back, not necessarily elsewhere.
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When I published the second contour in 2013, I explained the methodology for the second option.
Something like the 1981 UNI-CAR has a very 'conservative' roofline.
Next year's 2021 Maserati MC20 is especially challenging. It's a more aggressive AST-II profile until it collides with the body at the beltline, then reflexes ( von Mises ) to create direct downforce by extending half-way to the AST-I contour as a sheetmetal spoiler. The 2022 model will include a 195-mph BEV variant, and nobody would dispute the value of added downforce at these velocities, no matter what the static weight of the vehicle is.
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* As to the Prius, I've not re-visited that yet.
* I have done the 1st-gen Insight blueprint. At the trailing edge of the hatch, the glass is within 24.5mm of the AST-II contour. I don't know the roof length off hand. The Mitsubishi Lancer EVO had 19-mm boundary layer thickness at the roof's trailing edge according to one report. If the Honda was similar, it would place the local streamline a smidgeon above the boundary layer, making the TBL a bit 'nervous.'
* The 2nd-gen Insight is dead-on the AST-II.
* 2010 Honda FCX Clarity, ditto.
* 2011 Honda Crosstour, ditto.
* I believe that the 2nd-gen ACURA NSX is also AST-II.