F1technical.net

ringo wrote:...
As a reference, my rear wing makes 268 lbs of downforce at 50 m/s. and 112lbs of drag.

Yikes! Are you getting separation to get that high D/L or is it all due to the extreme camber?

It's difficult to design an F1 rear wing.
There is no coordinate data out there in public. I could improve the profiles now, but i'm ok with this wing. I doesn't have much separation on it.
The ratio's not bad still, haha. I was expecting worse. Keep in mind this is a 750mm wide wing, it's not going to be very efficient.

This was also an isolated wing, right? It is expected to work worse without the rest of the car, but of course it is easier to simulate. Trends is all we are going to get anyways.

...I doesn't have much separation on it...

The definition of much is relative. Quite possibly the way DRD works is by making the difference between no separation at all and "not much separation", which would be rather more dramatic than between "not much" and "a bit more" separation.
But thanks a lot for the first CFD in any case!

When i say not much separation, i mean on this wing it is separating on the regions way after where the DRD is having it's major effect.
I'm getting separation near the trailing edge of the first plane, and similarly on the second.
The DRD effect is on the bottom, as the profile start to rise.

Regardless of what percentages we are talking about or how good a L/D ratio, this will vary across teams, the DRD does infact reduce drag, but the overall efficiency of the wing drops and this is to be expected.

What i wonder,is why don't teams just increase the speed at which it disengages? s
Surely that will give enough time for reattachment of the flow.

Another way of reattaching the flow much easier is to add an end plate in the middle of the wing.
This is what we saw mercedes doing in the winter tests. Once you give the air something to "grab" onto the flow will reestablish itself.

they have a little mini end plate on the wing. I think this may return in a bigger size later down in the season.

flyboy2160 wrote:

ringo wrote:...
As a reference, my rear wing makes 268 lbs of downforce at 50 m/s. and 112lbs of drag.

Yikes! Are you getting separation to get that high D/L or is it all due to the extreme camber?

We would need someone like Iaman engineer or slc to get some ballpark value, but iirc the efficiency of a 2009 rule wing should be around 6-8

Those rear wings are not as efficient as we would like to imagine. It's not a plane wing, and it's not a multi element rear wing with 5 or so elements. I wont be suprised if the actual data reflects a not so impressive L/D.
F1cars are in fact very draggy cars.

I agree with you: that's why I said 6-8. Considering that the car as a whole is around 3,5 efficiency or more, that seems reasonable for the rear wing. Let us see if some user can provide good references

Both Lotus and RedBull have big splitter supports, would there be any point/way to stall the floor?

Floor stalling sometimes happens, i do not know if it is intentionally pursued because it is very difficult to control ie dangerous - i think there are other specific thread in which it is discussed