smoke flow images
 

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

Works for me. It's nice that they give frontal areas.

https://www.miataturbo.net/attachmen...44e-255719.jpg
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?

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

Focus 'external duct'
 

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

' door' ?
 

I'm uncertain about what is meant by 'door.'

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.

'passenger door'
 

I still don't know what you're talking about.
I don't see that happening in any of the photos.

I knew that link looked familiar.;)

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

https://www.miataturbo.net/insert-bs...us-cars-67417/
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/
RE:
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.

anger
 

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