Quote:
Originally Posted by Sven7
According to that, this would be correct? Am I interpreting that right? Phil?
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If the vehicle is taller than it is wide,I would consider treating it as a 'section' rather than a 'half-body.'
For the 'section' the plan-view taper would determine the streamlining.
In plan-view you would mimic the contour of the lowest drag 'section',then pattern your roof contour to mimic what you arrived at for the sides.Somewhere (maybe in the 'Full-boat-tail 'trailer thread is the drag table for 'sections.'
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If the vehicle is wider than it is tall,then use the 'Template'.
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If you're interested only in limited length,with absolutely no intention of future additional drag reductions,then consider the Wolfgang Klemperer streamlined 'minivan' of 1922.NASA's Dryden Research Center Econoline boat tail has this profile.It's what I did on the VW Transporter in college without knowing it.
Klemperer measured Cd 0.16 for the wind tunnel model.It looks like Hucho or Rolf Buchheim re-tested the same model for the VW 2000 project and measured Cd 0.15.
The hitch is that the vehicle must look exactly as Klemperer designed it and it is very doubtful that you'd be able to see out of the car.
Hucho ran into this problem and VW had to morph Klemperer's shape so much that they ended up with only Cd 0.25.
This is why I stay away from it.