Quote:
Originally Posted by MazdaMatt
Cd is area-irrelevent, right? Cd*A is what calculates out the drag coeff, right? Cd is simply a product of shape and surface imperfections, so a 1/25 scale model should have the same Cd, but a much smaller Cd*A.
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That is correct, assuming that the Cd for both were measured at the same Reynolds number.
Quote:
Originally Posted by texanidiot25
Possibly this weekend I'll grab an old magazine article I have at my home, I think from hotrod mag of an 89 NASCAR Monte Carlo vs. a Lemans Porsche LMP car. Despite the Monte Carlo having a near stock-car body and obviously a boxier car, was able to reach higher top-speeds and had less of a Cd. thanks to it's smaller frontal area.
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Quote:
Originally Posted by MechEngVT
NASCAR Monte Carlos have next to zero downforce. An LMP car should produce tremendous downforce at high speeds. Increasing downforce will increase Cd (I guess the opposite of lift/drag ratio....anti-lift/drag ratio?) so at say 170mph the stock car is probably weight-neutral and pulling through the air but the LMP car's tires are about flattened and suspension bottomed and drag-limited which isn't a problem in their racing series since the fastest those cars ever go is down the Mulsanne at LeMans but typically go much slower through tight turns without banking. Different cars for different purposes.
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Correct! Again, as MazdaMatt says, drag is not solely based on Cd, and don't forget the power and weight differences.
Quote:
Originally Posted by whokilledthejams
On the other hand, my girlfriend, I think, thinks I'm a dumbass. Of course, I remind her that she has no right to complain about $4.25 gas if she continues to drive like a jerk. Then, she gets angry. You wouldn't like when she's angry. She could save a car payment a year by just driving more sensibly.
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She gets angry because women don't like their emotionally-based opinions to be trumped by logic. Been there, done that, still have the scars!
Quote:
Originally Posted by .Cd
Let me ask a new question to all of you then :
Since apparently a brick like front end that has attached flow can be just as slick as a car that has a rounded nose, what good does it do to extend the nose out on our cars with coroplast extentions ?
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Because you are increasing the
fineness ratio.