[wyatt]

Kind of like the first generation Insight did along the side of the car, a nice rounding. I had not thought about it to the bottom, but it may help. As far as the veins go, there are some general rules that should be followed to transition turbulent flow back to laminar. If I remember correctly (this is a big if), you need a tube (or grate) that is AT LEAST twice as long as it is in diameter. We had a setup we used that would create turbulent flow in one section, but before getting to the next we had to have good laminar flow again, so we used straws bundled together. I don't know if the same rule applies to spacing between vanes, or if it works on a larger scale than straw-diameter tubes (which would not be practical for cars with road grime).