McMrocks wrote:i saw the video and i think McLaren also must have the effect of spillover.
But i can't believe that McLaren makes RWs with vortices, because there is no downforce but drag. But we sometimes saw a vortex at the McLaren RW. So why they do this?
All of the cars make rear wing vortices. It's a natural result of using a wing. Even wings with endplates make vortices. I've got some poor pictures of cars other than McLarens making rear wing vortices at Silverstone last year.
The important thing is to make the L/D as good as possible. Having 100kg more downforce is no good if it comes with 100kg of drag, for example, because you'd get destroyed on any long straight. Getting 75kg more downforce but with only 25kg extra drag, on the other hand, is worth it. Sure you'd be marginally slower on to the straight from the corner (assuming the corner exit speed is downforce limited) but you'd be quicker for most of the straight (think China's long straight here as a good example).
Don't forget that powered absorbed by drag is a cubic relationship with respect to velocity ( bhp absorbed = (Cd . A . v^3)/1225 ) so anything you can do to reduce drag at high speed is good - the teams can't get any more power from the engines so they have to concentrate on drag in order to get decent straight line speed. After all, this is what the DRS is all about - letting the teams dump a good chunk of drag.