cool windscreens, how do you make em Options

[usa4cheer]

I am working on my grassroots motorsport challenge car and want to take the windshield out of my car and want to do the mini windscreen. How do you make it???

[skeates]

I hope that I can shine some light on the aerodynamics as far as the CD is concerned between the Flaired wheel wells and the non flaired wheel wells....

(Given that both are painted steel with roughly equivilent surface roughnesses):

The flaired wheels will created a larger surface area perpendicular to the air stream and therefore create a larger wake of turbulence behind the car as the airstreams seperate from the car, thus creating drag. This is evident when one stands directly infront of the car and looks at it head on. If the car in this case were 2-dimensional one would say the the car with the wheel flairs takes up more space than the one without, thus it displaces more air (read: deals with more friction) as a result.

Also the wheel wells add surface area to the sides of the car. As air moves past the car one can assume that the air directly touching the surface of the car is stopped in its tracks and as you move away from the car the speed of the air gradually increases to the overall speed of the car (known as the freestream velocity). This is why the wind is always much faster at about 10 to 15 feet above the ground. Now, keep in mind that this all happens in the course of a few micro-meters on the car. None the less this creates a certain friction which the car must fight against - the fast the car goes the more friction this creates. An example of this would be like trying to run in water. If one moves slowly it is pretty easy, but if one tries to go faster it gets much, much harder.

Now, as far as the flairs go - from an aerodynamic standpoint the stock fenders are more desireable as they end up creating less drag. However, the boost in handling and traction for very high accelerations provided by the extra meat under the wheel wells well outweighs the aerodynamic cost of the flairs - especially if one applies other aerodynamic techniques to the front of the car (which is where most of the drag is coming from anyways).

Hope this wasn't too long (IMG:http://www.914world.com/bbs2/html/emoticons/yellowsleep[1].gif) ,

Peace and Hope,

Steven

(IMG:http://www.914world.com/bbs2/html/emoticons/driving.gif)