I quoted this from ringo on page 13 of this thread this guys is awesome this is what I am talking about...
The only problem i have with the design is the underside, they should not have followed the contour of the upper surface. I would make it more like Newey's design and keep the underside as straight as possible. Mercs underside only acts to expand the air and increase pressure under the car, which is not desirable.
Newey style:
and I will add another pics that all the other team are adopting well off course maclaren is different because they used a plough instead, their approach is different but it serves the same as removing all those unwanted pressure from the underside of the car, because of the plough the air flows to the underside were being split to prevent the creation of too much pressure in the underside of the car. although renault is not included but their cars underside is using newy style design.
I agree with you ringo. if only merc have a design like this I just wonder how this could help their car in terms of sheer speed.