height, angle, shape, size and location in the correct place to delay the flow separation that normally happens at the back end of the roof. Testing (like the strings or yarn or smoke) would need to happen to determine these parameters.
This paper from Mitsubishi explaining the little shark-fin vortex generators is one of the best descriptions I've seen on how and why they work.
Mitsu VGs
The roof 'spoilers' (like some BMWs and Subarus have used) work under similar principles, with a similar outcome. Basically, the longer you can keep the air flow next to the body/glass, the smaller the wake and less negative pressure in the back-glass / trunk lid area, reducing drag and lift.
Or in the case of Mistu/Subaru, more clean-flow air hitting the wing element of their clothes-line spoilers.
This paper from Mitsubishi explaining the little shark-fin vortex generators is one of the best descriptions I've seen on how and why they work.
Mitsu VGs
The roof 'spoilers' (like some BMWs and Subarus have used) work under similar principles, with a similar outcome. Basically, the longer you can keep the air flow next to the body/glass, the smaller the wake and less negative pressure in the back-glass / trunk lid area, reducing drag and lift.
Or in the case of Mistu/Subaru, more clean-flow air hitting the wing element of their clothes-line spoilers.
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