smoke flow images

[aerohead]

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

[freebeard]

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?

[Piotrsko]

How come all the flows disappear aft of the door? Looks pasted on something elses tunnels l pictures. I call BS.

[aerohead]

Originally Posted by freebeard

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

[aerohead]

Originally Posted by Piotrsko

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.'

[Piotrsko]

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.

[aerohead]

Originally Posted by Piotrsko

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.

[kach22i]

Originally Posted by aerohead

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

I knew that link looked familiar.

11-18-2013, 04:41 PM
https://ecomodder.com/forum/showthre...-26678-16.html

Originally Posted by kach22i

29 images in link:
Windtunnel photos of various cars - Miata Turbo Forum - Turbo Kitten is watching you test compression.

[kach22i]

Originally Posted by aerohead

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/

Ford Focus RS
(A) 2,35 m²
(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/

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:

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.

[aerohead]

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