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Old 01-05-2023, 05:02 PM   #1 (permalink)
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smoke flow images

if it links
https://www.miataturbo.net/insert-bs...us-cars-67417/

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Old 01-06-2023, 12:25 AM   #2 (permalink)
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Works for me. It's nice that they give frontal areas.


http://www.miataturbo.net/attachment...ine=1343223372

That external duct over the back window appears to expand the streamline over the roof. Slows it down? Lowers the back pressure?
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Old 01-06-2023, 10:18 AM   #3 (permalink)
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How come all the flows disappear aft of the door? Looks pasted on something elses tunnels l pictures. I call BS.
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Old 01-09-2023, 11:23 AM   #4 (permalink)
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Focus 'external duct'

Quote:
Originally Posted by freebeard View Post
Works for me. It's nice that they give frontal areas.


http://www.miataturbo.net/attachment...ine=1343223372

That external duct over the back window appears to expand the streamline over the roof. Slows it down? Lowers the back pressure?
This 'direct-downforce' Rally-Car spoiler creates
1) ultra-super velocity
2) all pressure recovery is lost
3) base pressure is lowered
4) pressure drag is increased
5) overall drag increases, from Cd 0.297, to Cd 0.36
6) a 63-count increase
7) a 21% drag increase
A really stupid thing to do to a car
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Old 01-09-2023, 11:25 AM   #5 (permalink)
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' door' ?

Quote:
Originally Posted by Piotrsko View Post
How come all the flows disappear aft of the door? Looks pasted on something elses tunnels l pictures. I call BS.
I'm uncertain about what is meant by 'door.'
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Old 01-09-2023, 11:40 AM   #6 (permalink)
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Bottom 3 smoke tracers stop being visible aft of the passenger door trailing edge. One visible trace should have a burble after messing with the spoiler, it doesn't. Shouldn't EVEN have to comment about tracers disappearing at front.
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Old 01-09-2023, 11:48 AM   #7 (permalink)
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'passenger door'

Quote:
Originally Posted by Piotrsko View Post
Bottom 3 smoke tracers stop being visible aft of the passenger door trailing edge. One visible trace should have a burble after messing with the spoiler, it doesn't. Shouldn't EVEN have to comment about tracers disappearing at front.
I still don't know what you're talking about.
I don't see that happening in any of the photos.
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Old 01-14-2023, 06:48 AM   #8 (permalink)
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Quote:
Originally Posted by aerohead View Post
I knew that link looked familiar.

11-18-2013, 04:41 PM
https://ecomodder.com/forum/showthre...-26678-16.html
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1998 Chevy S-10 Pick-Up truck
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Chin Spoiler:
http://forums.pelicanparts.com/off-t...effective.html

Rear Spoiler Pick Up Truck
http://forums.pelicanparts.com/off-t...xperiment.html

Roof Wing
http://ecomodder.com/forum/showthrea...1-a-19525.html
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Old 01-14-2023, 06:58 AM   #9 (permalink)
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Quote:
Originally Posted by aerohead View Post
This 'direct-downforce' Rally-Car spoiler creates
1) ultra-super velocity
2) all pressure recovery is lost
3) base pressure is lowered
4) pressure drag is increased
5) overall drag increases, from Cd 0.297, to Cd 0.36
6) a 63-count increase
7) a 21% drag increase
A really stupid thing to do to a car
https://www.miataturbo.net/insert-bs...us-cars-67417/
Quote:
Ford Focus RS
(A) 2,35 m
(cd) 0,36
(cd A) 0,86
at 200km/h
downforce front 8kg
lift rear 4kg
Been a long time since Ford made a 2-door Focus, looking around found some information on the 4-door RS Focus.

2016
The Ford Focus RS’s Aerodynamics Design
https://mk3focusrs.club/about-the-ca.../aerodynamics/
Quote:
Jamal explains: “We have been doing a lot of aerodynamics development using wind tunnels and just like the Shelby GT 350, our objective for the RS was zero lift at the rear and the front. That is quite a lofty goal in a sports hatchback.”
RE:
Quote:
A really stupid thing to do to a car
If we could find out the unmodified cars lift numbers perhaps we could define "stupid".

Maybe not too stupid if the unmodified car when "driven in anger" tends to leave the road or at least crosses the painted lines on the road.
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Architect, Artist and Designer of Objects

1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft

Chin Spoiler:
http://forums.pelicanparts.com/off-t...effective.html

Rear Spoiler Pick Up Truck
http://forums.pelicanparts.com/off-t...xperiment.html

Roof Wing
http://ecomodder.com/forum/showthrea...1-a-19525.html

Last edited by kach22i; 01-14-2023 at 07:04 AM..
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Old 01-16-2023, 11:32 AM   #10 (permalink)
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anger

The third of Pakistan's population under water will be thrilled to learn that driving in anger is more important than their lives.

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