Regarding the F1 lift ideas the the above comment.
Over 50% of the downforce of is generated by the "tunnels" under the car. Those require a rather smooth racing surface underneath the car to work to maximum effect.
If you have a channel like that attached to the plane, the lifting force generated by the vacuum would be cancelled out by the same vacuum pulling on the top surface. The net effect, in that case, would only be increased drag.
I'm not an aeronautical engineer, by any means, but I imagine there are certain drag penalties that are incurred once per flying surface. If you add further flying surfaces, you incur those penalties again. This is usually acceptable in low speed airplanes (crop duster and fire fighting aircraft have wings and flaps everywhere possible to generate the maximum lift and happily incur the drag penalty). If maximum efficiency is desired at high speed, I imagine that a single wing is probably about as efficient as it gets.
It would be interesting to design an inverted F1 car in something like X-plane and see if you can get it to fly (or fly well).
Keep the ideas coming, though. That's how things get changed when somebody find something new that works.
