How can i reduce the drag coefficient on my F1 balsa wood model car?

Question

I am currently participate in the F1 in Schools Technology Challenge. My problem now is i can't reduce the drag that acting on the car. My drag coefficient currently is 5.0. I need to reduce it below 2.5. To professionals & whoever know how to reduce it pls help me.

Answer 1

i'm not a pro,but did aeromodelling so know a bit bout drag.you need to apply a balsa cement(the glue you used to stick the balsa wood parts)coat on the main body.this smoothens the surface.

Answer 2

5.0 drag coefficient? You're kidding, right? Even a parachute, meant to drag as much as possible, is around 1.5!

How did you figure that value? I think that your method is wrong.

Now, to reduce a drag coefficient, there are two things to look for: surface smoothness and shape. If the surface is already smooth, you can only work on the contours, which needs to be a continuous as possible, air does not like perpendicular flat surfaces, especially in the rear, as this cause the flow to separate. And you also need to check for induced drag, which is the result of the light one gets. If you want down force, you will have to pay the price in drag (for every unit of down force, expect between 1/5 to 1/10 unit of force as induced drag).

If you are serious about car aerodynamics, get yourself a copy of "Road Vehicle Aerodynamics" by A.J.Scibor-Rylski. That will get you started properly.