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I always thought of low drag as below 0.3, but maybe that was "low drag" at the time I started following aero.
But it depends on the power source, easier to get low drag by using electric power, so maybe my definition of low drag has changed now we need less cooling.
For me: sub 0.3 = low drag, sub 0.2 = very low drag, sub 0.15 = ultralow drag.
"Half-bodies, with active ground clearance and fairings would approach Cd 0.09." aerohead, what do you mean by that? I remember a discussion on here essentially saying that around 15cm is "optimal" for a "normal" car. How low or high would it need to be for the optimal for a half body? I would think optimal is zero.
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