Mythbuster: continuing project thread of my 1303 '75

[Gerrelt]

You could also try to make the ducktail spoler you allready have more effective.

In this autospeed article they talk about the vortex generators of the Mitsubishi Evo: Blowing the Vortex part 2
(a quote: "The longer the arrow, the faster the airspeed." ..inside keversite joke)

They talk a lot about less drag in the article, but I think these vortex generators are also there to direct more air to the rear spoiler, making it more effective.

The new Beetle RSi also does this, but then with a rear window spoiler:



I think its primary function is to direct more airflow to the rear bonnet spoiler.

Just some food for thought.

Edit: I found the Mitsubishi research article, interesting read: Research article