Actually I better expand slightly because that might come off wrong. : P
Looking at table
http://ecomodder.com/forum/attachmen...1&d=1247946422 i'm wondering what happens with basically a flat front, but the long soft tails. Like a cabover flat front semi given the whale tail treatment.
When you were talking about reversal of flow, do you mean something like the Streamlined Body (in that linked attachment) simply pointing forwards with a rounded bulbous tailend? Or something with the points going forward and backward? (no rounded anything) It's possible I wasn't clear that I wasn't seeking to reverse the whole streamliner template, just apply the same sharp point to the front as to the rear, like you might see in a ww2 droppable fuel tank. They don't have bulbous noses and I wondered why.
Is there an aerodynamic difference between "stairstepping" air out of the way (say the Streamlined Body in that attachment is, instead of one half circle in the front, say it was 3x as long in the front, where the long part of the nose moved 1/3 of the air out of the way, then the next 1/3, then the next 1/3... this to me is what the Airflow Bullettruck almost looks like, instead of a streamliner bulbous nose where it's stepping the air up out of the way up to the hood, then the cab top, then the trailer top, which I would think would be less efficient) But maybe it's not a huge difference because the front is only 25% of the drag/matters more in the tail..