Hello, I'm trying to think of the 4/5 seater car in the future. One great thing about the aptera currently is that it is so lightweight. As people are added and more car material is added to fit those people, then the weight will increase. I'm thinking of a spoiler that is primarily shaped to increase lift, which is the opposite intention of a spoiler, but would help decrease friction on the road. There are obviously times where more friction is needed, and so that would be why it should be automatically adjusted. The mechanism would be to raise/lower the spoiler or to change it's angle. I'm not sure if that is too much data to crunch in order to make it safe all of the time, but perhaps it would be useful in a highway mode where driving is mostly in a straight line.
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Jacob, the current design actually produces ~25 pound of downforce at the back of the car in addition to the weight of the rear suspension & wheel. Without it, the car would be directionally unstable and the back of the car would try to swap ends with the front. The Aptera's light weight and slick aerodynamics are incredible, but sometimes more weight is a good thing. Just not so much around my waistline - sigh!
My gut feel would be that the drag from such a spoiler would be higher than the rolling resistance it's decreasing. Therefore a net negative.