Re:A German Car That Was Ultra-Aerodynamic and Totally Impra...
by colanderman on Monday September 15, 2014 @01:50AM
(#8317451)
Also worth noting that a scale model of something (plane, auto, whatever) has the same Cd as the full-size version, showing that Cd does take area into consideration.
We're not disagreeing; we understand English differently. You say "Cd does take area into consideration" to mean that area has been divided out from drag measurements to produce an area-agnostic number; I say "Cd does not take area into consideration" to mean that Cd does not vary based on area (because area has been divided out).
These are the same statements. Both underscore my point that CdA, which is (by definition!) proportional to both frontal area and to drag force, is the worthwhile figure of merit for passenger vehicles (where lesser drag force translates directly into fuel savings).
We're not disagreeing; we understand English differently. You say "Cd does take area into consideration" to mean that area has been divided out from drag measurements to produce an area-agnostic number; I say "Cd does not take area into consideration" to mean that Cd does not vary based on area (because area has been divided out).
These are the same statements. Both underscore my point that CdA, which is (by definition!) proportional to both frontal area and to drag force, is the worthwhile figure of merit for passenger vehicles (where lesser drag force translates directly into fuel savings).