Quote:
Originally Posted by Christ
2% increase in A Of 100= 102.
5% decrease in Cd of .31 = .304
100*0.31= 31
102*0.304= 31.008
In this instance, by the numbers you suggest, you've not helped anything.
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You made a mistake but you didn't realize it because your head is buried in equations and you're not applying common sense!
100*0.31 = 31
100*1.02*0.31*0.95 =
30.03900
So yes,
if the Cd reduction is greater than the A increase, drag goes down. By definition.
That's the whole point of Cd. It's the ratio of an object's drag to a cylinder with the same frontal area. A car with 0.5 Cd has 2x the frontal area of a cylinder with the same drag.