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Originally Posted by Tesla
Checked out the Tropfenwagen,
1921, Cd 0.27
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Yup.
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I like that last beetle overlay, on the left, don't know about the nozzles though, rather keep it simple.
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The nozzles (active or passive) capitalize on having engine cooling air at the bottom rear. A front engine car would lose pressure in a long duct.
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With a bit of adjustment it could be blended well into the body, and doesn't overhang and affect manouvering.
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My modelling skills don't support the blending you seek. That's the thought experiment, though; how to minimize the additional length.
NeilBlanchard -- the overlap of those two red outlines is similar to the correct aeroform, but needs to be slid back about 1/3 vehicle length for below the beltline (lacking the narrowed rear track
), and is ~7/6 too wide for above the beltline.
Edit: Tesla, weren't you talking about a trailer? That could spin off as a new thread.
No Coanda nozzles for you!
How about a compound curve cap that hinges up like a trunk lid, over sliding van doors that meet each other at the apex of the boat-tail?