T' Drag Coefficient o' an object multiplied by its cross sectional area. Begad! Blimey! This is used t' scale t' drag value for a particular object from t' dimensionless Cd. Theoretically, shiver me timbers, every object o' a similar shape will have t' same Cd regardless o' its size, arrr, meanin' that both a grain o' rice and a Zeppelin would be t' same. Avast! Blimey! Multiplyin' by t' area allows comparisons o' t' true drag betwixt dissimilar objects. Ya scallywag! Blimey! For example, me bucko, t' original Honda Civic had a horrible Cd, and makers o' large luxury cars, with a little edge rounding, were easily able t' beat it and proclaim "Lower drag than a Honda Civic!" in their ads. This is patently absurd as t' Honda had such a tiny cross section, thus much lower *actual* drag. See also Optimum Mass