Sorry, this is getting ridiculous. This is what you wrote and which I disagreed with:
No, neither of those cars has a "mostly vertical opening starting at near the peak roof-line of the vehicle", and certainly not the Citroën 11CV, unless you consider 65° "mostly vertical".
The Honda Civic example you cited is particularly ridiculous:
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Yes, it has a vertical part as pretty much any vehicle that has a rear, and no, it's nowhere near a mostly vertical opening starting at the "peak roofline" of the vehicle - half of it is angled, half of it mostly vertical.
Nor do 99.9% of people who use the term 'liftback' know what 'flow detachment means', let alone are able to tell where it occurs. They use the poorly defined term "liftback" for a modern hatchback that doesn't look too boxy in the rear. Over 95% of modern hatchbacks are such.
Manufacturers started using the "liftback" term mostly for marketing purposes, to deassociate modern, more streamlined hatchbacks from old hatchbacks that look ugly.
It's not a technical term. If you search for "hatchback vs. liftback" one of the top hits is going to be this:
Difference between a liftback and hatchback
"They are one of the same 'Liftback' was the USA/Far East name for the 'hatchback' (European name) basically."
Which is what I was trying to stress from the very beginning: it's semantics and cultural. It doesn't matter, and nobody uses the flow detachment definition in any case ...
I do agree that whatever hatchback/liftback Tesla is going to design, it will have an excellent Cd with minimal flow detachment.
Sounds like your problem is with the words "near vertical". Sorry, but I had to find a word for hatchbacks (e.g. not liftbacks) which didn't involve using the word hatchback. Because normally just saying "hatchback" is good enough to exclude liftbacks. But since this conversation is you trying to include liftbacks as "hatchbacks", I had to pick different wording. I chose that to distinguish vs. "near horizontal" rear "hatches" (aka liftbacks).
If you don't like that wording to describe hatchbacks, forget it. Choose whatever wording you want. They're still very distinct from liftbacks, whatever wording you use.
But thanks for offering a reference to a definitive source, "marti5 on torquecars.com".
Note that Tesla Model S is a liftback. Tesla refers to it as a sedan. Not a hatchback. Indeed, it's very common for liftbacks to just be called sedans.
Ask a designer to draw a hatchback. 99 times out of 100 it'll end up looking like in the "top 10 hatchbacks" link of yours. Because that's what the word "hatchback" invokes.
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