There is still a lot of discussion and speculation around the Red Bull front wing and how it 'flexes', despite the increased loading tests that the FIA have put in place. Well I have a theory:
I do not think Red Bull are cheating.
I do not believe their wing flexes more than other teams. Infact for what I think they are doing, it may be necessary for it to flex
less than other teams.
I believe that the main planes and any tiers on the front wing are clevery designed to push air towards the outer edge of the wing, thereby increasing the load on the entire wing relative to the point where it connects to the nose. When I see close up images of other front wings, they appears to only direct air over the car, as the main planes on the wing appear to be level. Whereas the Red Bull wing appears to be curved all the way across, kind of like the rotor on a fan, pushing air toward the outside, to generate more lift (Negative lift, a.k.a downforce) as it is further from the point where it connects to the nose. What Red Bull have done is taken steps to increase the loading on the front wing, thereby allowing it to flex more than the other cars, whilst it maintains the level of rigidity required for the FIA tests.
The gains on downforce alone are small, however due to higher load the wing flexes more, pushing it lower to the ground and reducing the drag. This allows them to run a greater wing angle, thereby producing more downforce for the same drag coefficient.
The FIA regulations allow for a maximum radius of 10mm on the front wing main sections. But this is significantly greater than what is needed to fulfil the length allowed in the regulations. (I'm not saying this is a bad thing, it would suck if all teams had identical specification front wings). Red Bull are utilising the full length allowed to push as much air as possible away from the nose. The 10mm radius limit means they can curve it at a greater angle, as the gains of pushing the air out towards the edge of the wing will be worth the extra drag it incurs. The limit needs lowering significantly.
I have no doubt that this isn't the key to Red Bull's dominance, infact it's probably only 2-3 tenths of their advantage. The RB5 seems to have had the same design philosophy, but it was far less effective. This idea has taken Red Bull a couple of years to develop and refine.
At least, that is my theory on this issue.
I believe a solution to close the gap would be to decrease the maximum width of the front wing, this will significantly decrease the gains that Red Bull are getting as it reduces the distance from the load to the part that connects the front wing to the nose. Also, decrease the length and height as this limits the potential to push air to the outside of the wing.