Ideal design for underbody venturi?

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SoftBatch
SoftBatch
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Joined: 29 Jun 2006, 21:53
Location: Madison, AL, USA

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furnik28 wrote:scarbs you can use your design with as like the enzo ferrari has.
[img]Documents%20and%20Settings\Administrator\Desktop\automotive%20pics\carphotos\supercars\ferrari%20cars\enzo[/img]
We can't see things on your desktop :wink:

furnik28
furnik28
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Joined: 04 Dec 2004, 00:39
Location: australia

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HOW DO YOU POST PRIVATE PHOTOS FROM YOUR COMPUTER
rok

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Tom
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Joined: 13 Jan 2006, 00:24
Location: Bicester

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You will have to post them on http://www.imageshack.us

You click on upload 'file' and then browse until you find the file you want to put up then choose the size, 320x240 should do, then click 'host it!'

After a while loading your pic will be online at which point you can select one of the url's given, copy and paste it here, then select it and click 'Img' at the top of the message box.

preview your message before you post though and just experiment till you get it right.
Murphy's 9th Law of Technology:
Tell a man there are 300 million stars in the universe and he'll believe you. Tell him a bench has wet paint on it and he'll have to touch to be sure.


furnik28
furnik28
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Joined: 04 Dec 2004, 00:39
Location: australia

here you go

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rok

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slimjim8201
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Joined: 30 Jul 2006, 06:02

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I've also posted this link in one of the BMW "nose-wing" threads, but I think it is rather fitting for this discussion as well...

Underbody Study

Image

Image

zac510
zac510
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Joined: 24 Jan 2006, 12:58

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Reca wrote:A few pictures of pressure distribution on underbody, wind tunnel models visible at Galleria Ferrari in Maranello.

F430

[IMG:150:128]http://img47.imageshack.us/img47/7273/f430wt3sj9.th.jpg[/img]
Howdy Reca, how highly do you rate the F430 diffuser? I have heard that it is a bit too steep to work properly. The pressure plot there looks like it might have been airbrushed on, however a reasonable look into what is supposed to happen.

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Powerslide
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Joined: 12 Feb 2006, 08:19
Location: Land Below The Wind

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Under carriage downforce is not exactly an answer from heaven. If your suspension is not stiff enough you will get bad pitch reaction and under braking moves too much forces to the front of a car taking away rear grip. You will get into trouble when turning into a corner under braking. Reasons are, the car tilts forward and the front dives lower, making the front air dam even more effective because it blocks more air, the front under carriage becomes closer to the ground making for even better ground effect and to make things worse the rear lifts up making the rest of the under carriage a ventury to create even more vacuum on the front end while it takes away its potential at the rear. So for those who loves to put over done looking side skirts, beware.

It is this field that a wing is far better. The more you tilt the more the rear wing tilts and pushes the rear end minimalizing center of pressure movement. In general ground effect is sensitive to car behaviour. Take a sucker cup and pull it out, it won't move but when a slight opening happens it suddenly loses all its energy. That there also tells the strength of ground effect.

8)

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tomislavp4
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Joined: 16 Jun 2006, 17:07
Location: Sweden & The Republic of Macedonia

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The central part of the enzo´s underbody is flat not shaped, just the front and the rear of it are shaped so it isn´t so eficient. Read about the lotus and you´ll find out that the air in the ground effect doesn´t need to be in touch with the outside air at the side of the channels. That´s why they used rubber skirts to prevent the air in the channel to mix with the outside air. Do you see skirts on the Enzo???? So it doesn´t rok, furnik28.

Hobbstweedle
Hobbstweedle
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Joined: 12 Aug 2006, 19:40
Location: Deerfield, Illinois

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You should check out http://www.mulsannescorner.com. There's lots of aerodynamic info about Le Mans Prototypes and other sportscars in the 'race car tech' section.