Because of Bernoulli Principle (not the one that invented computer disk drives), there will be a tendency of lift if a car has a perfectly flat bottom. The Ferrari (and race cars with diffusers) was designed so there is room for a diffuser. The diffuser was probably on the original concept, and the component layout was designed to accommodate the diffuser. Tons of $ and wind tunnel time is needed to do it right.

 

You guys need to look a the underside of more racecars.
If nothing else cleaning up the underside of the car will decrease drag and you can get better gas milage.
For cooling you can add louvers which is what Porsche does on some cars.
On my racecar we made it as flat as the rules would allow. I can't have any panels covering the area under the rear axle the size of the wheel well openings and the same in the front. Other than those places it's flat. I have a splitter in the front and a small spoiler in the rear. I get no lift. I get downforce.
If you get a chance look under a Formula Ford it's flat and has no wings I don't think they get lift.

 

don't forget to account for the x-brace

 

I think S2WOOW has it right. A flat panel on the underside, I think, will turn the car into a fairly classical lifting body shape - a wing. A flat underside with tunnel channels and a deep front chin spoiler could create a substantial low pressure area. I don't think you can jerry-rig an aerodynamically workable underside because the car wasn't designed that way and there just isn't enough room.

2x6spds

 

-S2WOOOW

Your point of the Bernoulli Principle having a tendency to lift the car with a perfectly flat bottom is not completely valid. You really want a smooth underside but with a few key features.

- the fluid (air) entering the front underside of the car needs to be greater than the fluid leaving the rear of the car. (increase the speed of the fluid)

-There must be little to no fluid leaving the sides of the car. (the reason for side skirts)

With these two features you create a reverse aircraft wing effect. Hence, (major)downforce instead of lift.

 

2x6spds' comment is exactly my point. Konrad, I agree, and I agree that race cars have and should have smooth bottoms and diffusers (if rules allow), but we are talking about a road car with a guy with ideas, and no offense to Mingster, I think a lot of Research and Developement is needed. I think the concept is good, but the practicality of applying it to the S2K isn't there. Race cars are run under fairly strict conditions, and can be lower to the ground than a road car. That makes controlling the airflow under the car more managable, and the cars are most likely designed with a flat bottom in mind. I think that a lower air dam may be enough for Mingster.