Originally Posted by Baja
which would work better a true airfoil inverted to produce downforce. a simple rear wing like those that come with most touring cars or a simple spoiler like a nascar style body. Then if none actually produce downforce in a useful amount, Which would produce the greatest amount of drag? Then how do i take this knowledge and apply it to my car?
A nascar spoiler would probably have no benefits on an rc car. On a road type car, the sideways profile of the whole car is a little like an wing, so many road cars actually would have positive lift (upwards) in their basic shape. The nascar wing just stops the air moving over the top of the car fast and creating low pressure which causes lift.
The best way to increase downforce would probably be to seal the bottom of the chassis to the bodyshell (something like lexan might do it) so the air can flow smoothly underneath. Then make the chassis very slightly lower at the front than the back and make a diffuser at the back of the bodyshell. If you add side skirts made of lexan that would probably have a massive effect. Underbody aerodynamics actually give competition cars a lot of their downforce. A dual element wing would help as mentioned.
Maybe it'd be possible to use a leaf blower to create a kind of wind tunnel. If you sit the car on a flat board and then on top of some scales you might get a reading when u've got air flowing over it???