I received some more GOE222 aluminum aerofoil today - two 1.6m (5.25ft) lengths.
For interest's sake, I thought it might be good to have the aerofoil projecting vertically through the sunroof of my wife's car, as she drove at 50 km/h (31 mph).
By rotating the aerofoil I could then get a (literal) feel for the forces involved. It was quite fascinating.
It was easy to set the aerofoil to an angle where basically no drag could be felt, but by rotating it a little you could get an amazing amount of sideways force (ie lift or downforce if the wing were horizontal).
I was really surprised with how hard it was to stop it moving sideways. That's what it wanted to do - as the official lift/drag figures show, even when developing max lift/downforce, the drag isn't very high (ie it didn't much want to move backwards).
So no figures (I have done 'proper' measurements on multiple other occasions with this extrusion) but a startling indication of the forces that can be developed.
So there's a test I haven't done before.