[Christ]

I might be pissing in the wind here, but I thought you could get away with almost any size model as long as it was scaled properly and proportionate to the full-size chassis? (To get an idea, anyway... certain things will change anyway, because the boundary layer will stay the same depth, while small protrusions will get even smaller on the scaled-down version.)

Then you take the Cd number you got, and * it by the A of the full-size version to get the CdA, which is your best representation of aerodynamic efficiency.

If I'm right, I'm right. If I'm wrong, you'll get some crooked number that's probably unrealistically low, and you can kick me in the shins.