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But if the air came out of a slot going around the rear edge of the car and the slot was angled such that the air formed a virtual boattail (or kammback), it would need much less air and therefore energy.
I think it's a bit excessive to try fill the void behind the car with air flowing the same speed as the car.
What's needed here is a Blown Kammback. Much like the blown flaps we hear about on planes. I haven't even got around to making a regular kammback but some of you guys here seem to have the time/abilities etc.!!
ollie
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