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02-11-2003, 02:39 PM | #251 |
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You kinda lost me there. A wing works by differences of pressure. It can be level like in the pictures above and still create lift or downforce. For dowforce, there is more surface area on the lower side of the wing. So the air travels faster across it, and faster moving air has lower pressure. So you get a high pressure zone on top and a low pressure zone on the bottom, causing downforce.
When the wing is at its steepest angle of attack though, what I said in my last post applies. The wing stalls and you get a lot of drag.
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02-11-2003, 05:36 PM | #252 |
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Ok, let me re-explain, since technically speaking what I said before isn't exactly right. There are two components to aerodynamic force. Lift and Drag. Drag acts in the same direction of the air coming at the airfoil. If you look at a car driving forward, the drag will always be straight back level to the ground. It does not matter what the angle of attack of the airfoil is, it doesn't change the direction of drag, only the magnitude. Lift on the other hand will always act perpendicular to the air stream coming at the car. Negative lift is what we refer to as "downforce." This is what keeps the rear end of the car planted and dents the trunk on the 22B. Drag is what slows your car down and reduces top speed etc..., negative lift is what keeps your car on the road. Make sense now?
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02-11-2003, 05:38 PM | #253 | |
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02-11-2003, 06:00 PM | #254 | |
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02-11-2003, 06:40 PM | #255 | |
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tipping the back end of the wing up will add drag, but also add downforce. Having it perpendicular to the ground at the minimum drag position will help smooth the turbulent flow off the roof, reducing some rear lift, but it's trading the drag for downforce that most large rear deck wings take advantage of. |
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02-11-2003, 06:54 PM | #256 | |
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02-11-2003, 10:32 PM | #257 |
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All the pictures I have seen seem to show that the horizontal component of the wing has very little "angle of attack", i.e. it's at a 90 angle from a vertical off the ground. If this is true then for the wing to work it would require that there be a sufficient bulge underneath that horizontal component to increase the spead of the air underneath it enough to create a substantial downforce. Otherwise it would need a certain "angle of attack" to create enough drag, transfered through the rest of the wing, to create downforce. Just a thought... maybe someone who has seen it in person can detail the wing for us?
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02-12-2003, 09:46 AM | #258 | |
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and...No, in that even a flat wing with very little angle of attack and no bulge underneath can still smooth the turbulence off the rear window area, reducing rear lift. It looks pretty much the same in person as it does in the pictures, not much angle of attack, and didn't appear adjustable to me. |
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02-12-2003, 12:19 PM | #259 |
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Thanks, that helps pull it together in my mind.
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