F40 rear air fence?

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Just to be clear, and easy to save.

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I had lunch with Jason today who is now head of Style at Bertone. His latest Supercar will debut at Villa d' Este and Shanghai and will also be at Goodwood FOS and Pebble. It is really remarkable. Jason is very knowledgeable about Aerodynamics and his latest will have the lowest Cx of any street legal Super Car ever, lower than .3 . It will also have the same down force as
P 4/5 which is twice that of the Enzo. After seeing it's chassis and engineering I think it will also be the fastest street legal car around the Ring ever. We had a discussion about aerodynamics and he said that aerodynamic devices that create down force are very measurable at highway speeds. He also said that aerodynamic devices that create engine compartment cooling flow come on in some cars, via fans at zero mph, the 599XX and Enzo FXX as well as many others, and that the engine compartment outlet shape is very important in increasing that flow and vanes and fences at engine cooling vent outlets help tune this flow. His latest Supercar has a aerodynamically tuned engine compartment outlet as does P 4/5 as does the car referenced in this thread in post 8.

 

Note cooling exit vent that Alberto/WWOC/Sal and I developed for the 308 as discussed in post 107.
Compare earlier 308's vs later 308's.

The photo in the middle shows where we got the idea. Also note that there are fences used on these outlets which enhance air cooling flow.
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Or Pininfarina should have been paying attention to what Bertone was doing...
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Very bizarre that they weren't. The difference that this exit outlet vent made was enormous. Before we cut it in the only way I could make it up the West Side Highway in the summer at rush hour was without AC and I sometimes had to even put on the heat to keep the water temp. off the peg. After we cut in this outlet I had no overheating problems.

 

Note high downforce position of cockpit controllable wing in low speed corner.
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bump

 

If you check out the vanes in the exit vents in the TR and 348 deck lids you'll notice nice air fences along the bottom edge of the vanes at the rear. These fences tune the air running through the engine compartment which results in better engine cooling.

 

From a Ferrari press release on the F 430:

The rear wheels feature fences (deflectors) like those used on Ferrari's single-seaters, and increases the speed of air flow under the tail of the car creating an area of depression and ground effect that pulls the car down. In this conformation, the underbody actively helps increase downforce to a maximum of 150 kg over the rear axle. Aerodynamic development also had a part in extracting the maximum performance from the new 4.3-litre V8. The two intakes for the engine are positioned over the driven wheels in an area of high flow pressure, thus guaranteeing a greater volume of air to the intake manifold.

 

Here are some interesting Vortex generators on an EVO.
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The Spoiler on the new Porsche Panamera deploys at 56 mph.

 

The Tata Nano also has a rear air dam.

 

Loss of lift on the lifting surface is the key. As the ice causes the lifting surfaces to become inefficient the speed at which stall will occur increases because the lifting surfaces are less effective. It's amazing how small a disturbance can make a difference.
When I flew Gliders even squashed bugs on the wing could spoil lift. As you stayed up you could feel it.

Jim is a fantastic engineer and person. His cars are wonderful. He has a great sense of humor. His horns were rubber ball tooters. His FIA suitcases were tacked on. IMO if he used a conventional gearbox he would have won over and over.

Note how the new 458 uses Canards like P 3/4 and P 4/5. Race car aerodynamics finding their way onto street cars.
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I wonder why?

 

Some conditions need more down force than others on the nose. Micheletto used this same removable canard system on a certain 333SP that was driven as more of a club racer than a race car. Canards balance front to rear down force and add down force to the nose. In the case of the 333sp that was being driven, shall we say, a bit too slowly the extra canards were added to enable the driver to keep the nose planted, reduce low speed understeer, at the slower speeds he was tooling around at. It's interesting to note that WWOC and Alberto P also worked with Micheletto on this solution for the club racer 333sp .

The 458's canards are very interesting. You need down force at low speeds in the turns. At high speed they add drag and hurt VMAX. The angle of the 458's canards move at speed by bending so they provide maximum benefit at low speeds but bend to a flatter angle at high speed to lower drag.

P 4/5's aerodynamic devices and to a lesser extent the Enzo's also work this way, more angle at low speeds, cranked out at high speed.

Jim of course understood this in 1967 and that's why his aerodynamic devices were movable from the cockpit. If the controls failed their default position was low speed/high down force. Note their position in the photo I posted.

 

Alot of LM's actually had them installed. They look cool.

 

Jim you are saying that the 458's built in dive planes will flex at speed or will they be electrically operated?

 

They flex at speed.

 

Jim,

According to the technical description, it's the boomerang shaped thingies (they call them winglets) at the front that are meant to flex at speed thereby closing down airflow through the rads and consequently reducing drag.

 

Ah. When I heard the winglets flexed at higher speeds to reduce drag I thought this was like The Enzo-P4/5 reducing
wing angle and nose difuser at high speed to lower drag similar to what the Veyron's rear wing does.
Thanks

 

I'm taking delivery of 90568 on the 12th of this month. I did notice the Gurney flaps on the car and although I do hope that they serve their purpose, they certainly don't look out of place on the car and they weight gain is negligible. This particular car was indeed raced competetively. The seller just cleaned the car up for show and use on the road (11month & $10,000 detail job). I don't know if the canards were ever actually installed. I'll find out. Hope to see y'all in Pebble Beach. Thanks