Just lifted this from another thread.
Most of the stuff I read hear on the undercarriage airflow is like the old fire training line, "get down low and go, go, go."
But then every now and then a comment like the one below pops up, but I haven't seen any numbers that quantify at what point it is better to go up, rather than down to reduce drag.
Quote:
Originally Posted by tasdrouille
Ground effect is the key part. The Aptera isn't exactly your average ground vehicule. The 0.15 reference is for a basic bluff body with wheels at regular car height. The higher from the ground you go, the lower the Cd will be for a given shape.
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