Gurney Flap?

ValidusVentus

So I'm toying around with the idea of putting a gurney flap on the trailing edge of my sport spoiler. At the moment I am not buying a wing. Anyway, I was going to go with something modest, say 2.5% of the cord length (which I'm not sure really applies since it is just a spoiler) so I was thinking probably just .5-.75" Thing is, I'm not sure of how much benefit it would actually be seeing as how there is no airflow under the spoiler, negating a lot of the normal effects of a gurney flap. So I am still in the thought process on this and looking for any well thought out input. One example would be the gurney flap on the back of the spoiler on the new C7 vette, especially the Z06.

I was also thinking of flipping whatever "L" shaped material I may end up using and applying it to the underside of the leading edge of the chin spoiler/splitter on the Stillen front end since it has no air dam and putting one in the stock location would be way back from the leading edge. Nothing major, maybe an inch, and I'd obviously have to make it out of something a bit flexible.

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