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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="oilwell1415" data-source="post: 9554575" data-attributes="member: 58424"><p>The rules don't allow that, but they do allow some measure of manipulating the entire roof panel.</p><p></p><p></p><p></p><p>Yes, it is like an airfoil, but it would be cambered in the direction that generates lift instead of downforce. Luckily it isn't very efficient at doing that.</p><p></p><p></p><p></p><p>To get meaningful data from a wind tunnel it needs to have a cross sectional area about 10 times greater than the cross section of the workpiece. For a car that means about 250 sq ft., or a 16' by 16' square, 10'x25' rectangle, etc. That part isn't hard. The hard part will be generating enough airflow. For a 20 mph wind you will need over 400,000 cfm of airflow capacity. A single 48" fan <em>may</em> be able to generate 20,000 cfm, so you'd need 20 of them. More speed=more fans, but you can't make the tunnel larger or the velocity won't go up, so you have to build a tapered exit that will allow more fans. $$$$</p><p></p><p>Do you have any pics of the bottom of the car? I don't remember any rules about ground clearance or what you can do to the underside. A diffuser built in the floor pan could build a lot of downforce and nobody would be able to see it and copy it unless you flipped it over.</p></blockquote><p></p>
[QUOTE="oilwell1415, post: 9554575, member: 58424"] The rules don't allow that, but they do allow some measure of manipulating the entire roof panel. Yes, it is like an airfoil, but it would be cambered in the direction that generates lift instead of downforce. Luckily it isn't very efficient at doing that. To get meaningful data from a wind tunnel it needs to have a cross sectional area about 10 times greater than the cross section of the workpiece. For a car that means about 250 sq ft., or a 16' by 16' square, 10'x25' rectangle, etc. That part isn't hard. The hard part will be generating enough airflow. For a 20 mph wind you will need over 400,000 cfm of airflow capacity. A single 48" fan [i]may[/i] be able to generate 20,000 cfm, so you'd need 20 of them. More speed=more fans, but you can't make the tunnel larger or the velocity won't go up, so you have to build a tapered exit that will allow more fans. $$$$ Do you have any pics of the bottom of the car? I don't remember any rules about ground clearance or what you can do to the underside. A diffuser built in the floor pan could build a lot of downforce and nobody would be able to see it and copy it unless you flipped it over. [/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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