[lunarhighway]

I'm inclined to think a spoiler with a sawtooth trailing edge might have advantages over a straight one.

here's how i arrived at the idea.

first of all vortex generators have the ability to reduce drag, while their effectiveness is debatable in some applications their fuctioning si quite well understood.
now when i compared vortex a vortex generator with a naca intake, the first thing you notice is they're very similar in shape, in fact a naca intake also uses vortexes to draw air into it's orifice, so basically a naca intake is an embedded vortex generator that draws air from outside in.

so what if we where to use a series of naca ducts in a lip spoiler. likely the naca intakes would draw air from the top of the lip to the bottom of it!
all of this would be a low drag affair, and no additional frontal area is generated.

one could simplify this setup by cutting of the rear of the naca duct leaving a trailing edges with a curvy sawtooth pattern, wich might even be further simplified to just real sawtooth, as are used on turbulator tape for example.

the whole idea starts to make even more sense, when you realize humpback whales have fins which rounded sawtooth like protrusions at the end, which in turn have been copied to design low drag blades for huge wind turbines.

so what do people with a better understanding of aerodynamics think? am i drawing the wrong conclusions or is there something there?