Im a car designer and engineers always tell me to make the rear shaper for better Cd. They want the air to follow the side and top but they want the air to seperate at the end becauseround shape creates negative pressure behind. Basically an egg with chopped off rear is the best, like a bullet.
Ok, maybe my TT point was a bad example but Prius, Insight has excellent Cd. Figures.
Good thing about Elise is that the bottom is completely flat and that should help a lot.
Compared to Elise? Does Exige have better CD? Im curious.
Its got a fastback but Its got a wing and fatter tires...
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Originally Posted by Conan
No. You are talking about two different concepts simultaneously. Drag and lift. The TT has very low drag. The round egg shape is very aerodynamic from a standpoint of low drag. However, it is lift that causes instability at high speeds. The prius and insight are probably very unstable at high speeds because they doubtfully have anything in their design to generate downforce. The reason you don't hear about them as being unstable is because no one drives them at 100 mph.
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