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Old 01-14-2023, 11:00 AM   #1 (permalink)
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What is the drag penalty for flush fit window louvers ?

By " flush fit", I mean louvers that do not rise up past the curve of the body.
When seen from the side, they are invisible.
Something like this :

Well, of coarse it varies by design and other variables, but is there a graph that shows a certain case study for flush louvers ?

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Old 01-14-2023, 11:15 AM   #2 (permalink)
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People with those louvers generally don't care about drag in a meaningful way for fuel mileage. Might be searchable data, but I suspect it's rare.
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Old 01-14-2023, 12:50 PM   #3 (permalink)
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I'm adding louvers ( instead of a window ) to my car because Plexiglass is so expensive. When I started seeing all of these Plexiglass shields being installed at my job, I thought I had hit a gold mine.
I was sure they were soon going into the dumpster, and that I could find plenty.
Here we are years later, and the Plexi is still up, but now has graffiti ( names scratched in ) on it, or is cracked and yellow.
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Old 01-16-2023, 11:39 AM   #4 (permalink)
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case study

I've no knowledge of such a study.
If they were 'airtight' they could perform a drag reduction function, as with the ganged, backwards-facing steps illustrated by Fredrick Lanchester in his 1907 book.

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