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SVTPerformance's Chain of Restaurants
Road Side Pub
Any aerodynamic guru's on here? need your opinions..pics inside
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<blockquote data-quote="Ferris Bueller" data-source="post: 9552339" data-attributes="member: 74149"><p>Aerospace engineer here. Looks like your car creates downforce mostly at the nose and the rear wing. The nose is out front and in clean air, so no worries there. (bigger wing in front = more downforce) The rear wing is fed with a smooth laminar air from the flat area through the "passenger area". The rear wing seems to be designed with this in mind. Since the wing is a fixed size and at a fixed angle of attack, the way to increase downforce for the wing is to increase the air velocity passing over it. A windshield will prevent the air from taking a straight shot to the wing by making it go up and over the roof and separating the airflow from the car creating a turbulent area over the wing. Slower air = less downforce. You may be able to prevent this by adding a rear window at a shallow angle (think fastback). However, adding a front windscreen will significantly increase drag. Drag is affected by the cross sectional area the airstream will see, which can be visualized by looking at your car from directly in front. Without the wind screen, this area is fairly low, but add a big section that the air has to go around (windscreen) is going to make some additional drag.</p><p></p><p>If you want to increase the air velocity over the rear wing, you could add a teardrop shaped cowl behind the driver's head. This shape has a lower coefficient of drag and will keep the airspeed high when it passes over the wing.</p><p></p><p>If you want a windshield to protect the driver from the wind, you might be able to put in a short, narrow screen that will direct the air up and over the top of the driver's helmet. This, along with the teardrop cowl, should keep the wind away from the driver and keep the airspeed over the rear wing high.</p><p></p><p>Sorry if this explanation is a bit of a mess, just finished a 10.5 hour day crunching on aerodynamic problems and my brain is a little spongy.</p></blockquote><p></p>
[QUOTE="Ferris Bueller, post: 9552339, member: 74149"] Aerospace engineer here. Looks like your car creates downforce mostly at the nose and the rear wing. The nose is out front and in clean air, so no worries there. (bigger wing in front = more downforce) The rear wing is fed with a smooth laminar air from the flat area through the "passenger area". The rear wing seems to be designed with this in mind. Since the wing is a fixed size and at a fixed angle of attack, the way to increase downforce for the wing is to increase the air velocity passing over it. A windshield will prevent the air from taking a straight shot to the wing by making it go up and over the roof and separating the airflow from the car creating a turbulent area over the wing. Slower air = less downforce. You may be able to prevent this by adding a rear window at a shallow angle (think fastback). However, adding a front windscreen will significantly increase drag. Drag is affected by the cross sectional area the airstream will see, which can be visualized by looking at your car from directly in front. Without the wind screen, this area is fairly low, but add a big section that the air has to go around (windscreen) is going to make some additional drag. If you want to increase the air velocity over the rear wing, you could add a teardrop shaped cowl behind the driver's head. This shape has a lower coefficient of drag and will keep the airspeed high when it passes over the wing. If you want a windshield to protect the driver from the wind, you might be able to put in a short, narrow screen that will direct the air up and over the top of the driver's helmet. This, along with the teardrop cowl, should keep the wind away from the driver and keep the airspeed over the rear wing high. Sorry if this explanation is a bit of a mess, just finished a 10.5 hour day crunching on aerodynamic problems and my brain is a little spongy. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
Any aerodynamic guru's on here? need your opinions..pics inside
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