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Old 03-20-2021, 10:00 AM   #1 (permalink)
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Ford Sierra XR4i Bi-Wing Spoiler?

Hey all, do any of you have info/explanations of the aerodynamics behind the Bi-wing spoiler on the Ford Sierra/Probe III concept. Iíve read that it reduces drag, but Iíve also heard that itís a measure for creating downforce. Iíve not found a concrete answer yet.

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Old 03-20-2021, 11:26 AM   #2 (permalink)
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Just off-hand, looking at the angle of the back glass, the spoiler more than likely does reduce drag primarily by reducing lift. I've never seen an analysis of it on that car specifically however.
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Old 03-20-2021, 12:27 PM   #3 (permalink)
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Here is a site-wide Google search for bi-wing. https://ecomodder.com/forum/google_s...5679j6676099j7

It's not helpful to me because I have Prefs set to max number of posts per page instead of 20, and Google's search is page oriented.

Maybe you'll find something there. F1 front wings have gone away beyond bi-planar.
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Old 03-20-2021, 11:43 PM   #4 (permalink)
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Quote:
Originally Posted by JacobLeSann View Post
Hey all, do any of you have info/explanations of the aerodynamics behind the Bi-wing spoiler on the Ford Sierra/Probe III concept. Iíve read that it reduces drag, but Iíve also heard that itís a measure for creating downforce. Iíve not found a concrete answer yet.
It reduces pressure under the wing, so causing better flow attachment and allowing the rear spoiler to work better.
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Old 03-22-2021, 02:26 PM   #5 (permalink)
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Not the vehicle you requested, but adjacent?

Porsche 911 Ducktail - Study/Alternate
https://ecomodder.com/forum/showthre...e-36229-3.html
Quote:
Originally Posted by kach22i View Post
Below similar to the TV show Wheeler Dealer episode with the 1985 Ford Escort RS - Cosworth.

Was this:
VWVortex.com - So who didn't catch the Escort RS Cosworth episode?


Now this:
Wheeler Dealers: S14 E1


That middle wing shown above added 25 lbs of down-force in the wind tunnel, no idea how much drag it added though.

https://www.topgearbox.com/cars/ente...t-rs-cosworth/


I don't remember if the "25 lbs of down-force" comment was from a video or post in that thread.

I do recall finding the Escort RS Cosworth when doing a search on the XR4i, so there may be common material in videos and articles floating around the Internet.
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Last edited by kach22i; 03-22-2021 at 02:32 PM..
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Old 03-22-2021, 05:10 PM   #6 (permalink)
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Bet it's turbulent as sin back there.
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Old 03-24-2021, 11:34 AM   #7 (permalink)
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Cosworth

I think I posted on this car a decade or so ago. I suspect it's in my lectures.
From memory, it was a homologation special for rally racing. The rear addition provided downforce at the expense of lower top speed. 20- to-30 counts extra drag. Two-to-three miles per hour slower.
I'll try and find it.
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Old 03-24-2021, 11:58 AM   #8 (permalink)
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Interesting that this come up, I’ve considered a version of this for drag reduction on my Ion. Everything angled to reduce drag though
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Old 03-24-2021, 12:14 PM   #9 (permalink)
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explanations

Quote:
Originally Posted by JacobLeSann View Post
Hey all, do any of you have info/explanations of the aerodynamics behind the Bi-wing spoiler on the Ford Sierra/Probe III concept. Iíve read that it reduces drag, but Iíve also heard that itís a measure for creating downforce. Iíve not found a concrete answer yet.
Lutz J. Janssen & Friedl W. W'u'lfing were the co-inventers.
If you can find a copy of United States Patent No 4,533,168, it has their full explanation.
I got mine off micro-film at the Dallas Public Library. It could be available online.
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Old 03-24-2021, 04:32 PM   #10 (permalink)
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Thanks all. I’m still in search of a boat tail alternative, then. Still very interesting, and visually surreal.

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