Okay I am going to need some further clarification here.PhillipM wrote: You're not talking about overall downforce/drag change but relative downforce/drag change, which is a much different effect, especially when it's not the overall angle change as per in that image but the change of the second element by a fixed distance to stall the entire wing, which that diagram is not at all relevant to.
However, if you are going to bring overall AoA into it, you'll also note that the lower element on the Mclaren is running very little AoA - it may be a deep wing but the front edge is lifted compared to such as Torro Rosso, (in fact, you can see that in your own photo), or the Red Bull, who you'd assume to be running similarly low DF, as below.
http://imgr1.auto-motor-und-sport.de/Re ... 957560.jpg
http://i.imgur.com/HXbNyAz.jpg
Whether the extra camber hurts more than the AoA is one for the CFD guru's on here.
My original statement was that the drivers with a higher downforce rear wing (i.e. larger and/or steeper) would receive a larger kmh benefit from using DRS then drivers that had a very skinny low downforce rear wing.
Do you agree?