What's Good wing? and what's Bad wing?

This article shows you some factors that affect performance of wing.

What we are describing as a wing means especially GT-wing which is consisting of single element airfoil and can be seen in the sports car races e.g. GT3, GTE, DTM etc.

The reason why we clarify this is because in aircraft industry or turbo blade wing may has some different factors.

By the way, In sports and GT car racing, wing are fitted to rear trunk to get some downforces at the rear. And producing drags at the same time.

In brief...

The thing you need to mind for making your car faster is in the following order.

 

1.  Make sure wing's downforce capacity fills aero balance, "Lift coefficient". 

2.  Make sure wing has no separation, "Drag coefficient".

3.  Pitching sensitivity

 

the 2nd's "drag" affect your top speeds and fuel consumption.

However in GT car aerodynamics, the drags from rear wing is relatively small than the whole car drag value.

So, unless the drag are significantly large, the increase of drag can be ignored.

The more car has downforce at the rear, lap-times increase more as long as the aero balance allows, which is why the downforce capacity are coming to 1st.

The separation affects wing performance dramatically. As separation occurs, the downforce drop significantly and drag become huge.

This is showing how is stream line on the surface of under the wing calculated by CFD.

The flow in separation is disturbed at the end section on undersurface of the wing when the attack angle is too much or the airfoil shape is not good.

The sensitivity of wing means change of downforce with car in pitching motion. If you have too aggressive airfoil shows big change of downforce as attack angle changes and lose your drivability.

But this is completely depends on the airfoil design. So please buy a well considered and optimized GT wing.