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Old 10-01-2022, 02:42 AM   #11 (permalink)
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You might find some inspiration checking the design of the hatchback versions of some cars which used to be available in Europe, with a bubble-shaped rear glass. Remember the early Ford Mondeo, Euro equivalent to the US-spec Ford Contour and Mercury Mystique, which had the hatchback option in contrast to the sedan-only approach in the USA.

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Old 10-03-2022, 12:29 PM   #12 (permalink)
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Originally Posted by JacobLeSann View Post
A ducktail/lip spoiler is interesting. I see this on newer Chevy Cruze/Malibu models, Chrysler 300 models, teslas, etc. I never really did know how lip spoilers work, but seeing Aeroheadís CRX makes me wonder.

Adding a rear wing that extends the whole length of the rear into a boxed cavity (sort of like a Porsche K35 rear) is the main idea Iíve been looking at. I trialed a quick ní dirty bonneville style trunk extension on my long distance trip recently, which really did help the mileage.

The fastback is indeed a superior design, itís just that Iím trying to retain the stock practicality/aesthetics/vision. I plan to give the car to my mom once I fix up my hatchback. That one will get more radical mods. The hitch mounted tailbox is likely gonna go on that one, when traveling.

I think there is relatively stable flow down the top half of the rear glass. If you look at a side view of the FG2 chassis (as freebeard said), you can see that the transition to the rear glass is very gentle, even though itís a steep angle.
Dr. Wolf H. Hucho spoke of spoilers being almost as effective as just raising the body contour up to where the top of the spoiler would ultimately be located.
On a notchback, the drag will be affected by:
* The length of the roof in relation to total body length.
* Any aft-body roof camber/curvature.
* VGs strategically placed.
* Backlight angle.
* C-Pillar curvature.
* Boot height.
* Boot length.
* Addition of a 'wing' type spoiler.
* Addition of a flip-up spoiler.
* The 'effective' 'angle' across the backlight, to the trailing edge of the car.
* Aft-body camber/boat-tailing.
* Diffuser ( if paneled upstream ) [ I personally do not subscribe to non-belly panned diffusers ].
PS A spoiler, by itself, cannot provide a pressure recovery function as would be experienced with a box-cavity, or proper boat-tail. The elongation is mostly wasted.

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