djos wrote:I did say "full ground effects underbody" did I not?
Like I said, the term ground effect is misused in that regard. Tunnels is not ground effect. Interaction of lower surfaces with the ground is ground effect.
Anyway, the CART underfloor shown above is not a "tunnel ground effect" floor. The bits indicated as tunnels are just diffusers and the vortex generators at the front are designed to use "vortex lift" to create downforce. I.e. they generate vortices which, by virtue of their low pressure cores, create downforce.
F1cars are ground effect devices.
If you are more fortunate than others, build a larger table not a taller fence.