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Old 10-08-2014, 11:07 PM   #1 (permalink)
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Does Ferrari 599 GTB Fiorano air ducting flying buttresses reduce drag?







According to Ferrari they create downforce without ugly wings.

Unlike conventional buttresses where the rear window is short, flat and vertical in the 599 GTB the rear window is long, inclined and curved.

Also unlike conventional buttresses they are open so they redirect air from the sides to the area behind the rear window, usually a negative pressure zone.

I think that by filling in the negative pressure zone they also reduced drag, Don't you think?

BTW such flying buttresses were used on the Honda/Acura new NSX prototype




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Old 10-09-2014, 02:12 PM   #2 (permalink)
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Could it be that these 'things' do not provide active downforce, but are there to make the air going along the side of the vehicle to go over the rear spoiler? Thus creating more downforce?
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Old 10-09-2014, 03:43 PM   #3 (permalink)
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I think they get rid of trailing vortices by moving air from the sides inward. The rear window is clearly too steep. Higher pressure in the back = more downforce. I'm sure the particular shape they used does something.
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Old 10-09-2014, 07:22 PM   #4 (permalink)
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I have no idea if they do much. I deleted one of them and ran a CFD simulation in an amateur program.
I looks as if there is a slight difference in the flow between them. By the way, the deleted side is on the drivers side ( left side of the car )







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Old 10-10-2014, 05:29 AM   #5 (permalink)
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I remember seeing these buttresses way back in 1993 on the Dodge 'Stealth' - though not as pronounced :
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Old 10-10-2014, 02:01 PM   #6 (permalink)
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Ferrari does that sort of thing.



But then, Volkswagen has been know to do so as well:

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Old 10-10-2014, 02:22 PM   #7 (permalink)
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Renault Eolab Concept does it too.



I would wager that it's a compromise to get slightly lower drag on a less-than-ideal shape such as a notchback/coupe (Ferrari, Acura) or hatch (Eolab). You'll note that all-out aero cars such as the VW XL-1 don't have them.
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Old 10-10-2014, 05:12 PM   #8 (permalink)
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drag

I don't know the answer.The C-pillar winglets on the 599 race car helped with rear lift with no drag penalty.Their 'suctioned' diffuser DID reduce drag.
On the Fiorano,the aspirated C-pillars may accomplish the same thing as the race car.Not really a drag reduction per se,just not a drag penalty.
PS the development of the winglets required hundreds of hours of trial and error in the wind tunnel.At 200-hours,that might be $400,000 at Pininfarina.
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Last edited by aerohead; 10-10-2014 at 05:15 PM.. Reason: add PS
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Old 10-10-2014, 06:38 PM   #9 (permalink)
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downforce

Quote:
Originally Posted by Joris View Post
Could it be that these 'things' do not provide active downforce, but are there to make the air going along the side of the vehicle to go over the rear spoiler? Thus creating more downforce?
This was the premise of the 599 race car winglets,so it's extremely plausible that this is what they're up to.
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Old 10-15-2014, 07:48 PM   #10 (permalink)
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Quote:
Originally Posted by Cd View Post
I have no idea if they do much. I deleted one of them and ran a CFD simulation in an amateur program.
I looks as if there is a slight difference in the flow between them. By the way, the deleted side is on the drivers side ( left side of the car )
Wow that's sooo amazing!
What CFD program is it? Where did you get it? How much does it cost?

BTW it looks like the buttresses help reduce the trailing dead area somewhat. Something like boat-tailing.

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