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-   -   How do I find... Cd and Frontal Area? (https://ecomodder.com/forum/showthread.php/how-do-i-find-cd-frontal-area-11518.html)

Bow 12-21-2009 12:08 PM

How do I find... Cd and Frontal Area?
 
I am having trouble find the follow numbers for my 1998 Nissan Frontier XE

Coefficient of Drag (factory)
Frontal Area (factory - sq. ft.)

Does anyone know where I can locate them?

gone-ot 12-21-2009 12:29 PM

...when in doubt, haul the tape-measure out!

...area (A) is simple: measure width, height and ground clearance! that'll get you the frontal area (don't forget to subtract the ground clearance from the height!)

...Cd is gonna be a "search & find" situation, I'm afraid.

Bow 12-21-2009 01:27 PM

Thank you sir!

Is that Roof height, or Hood height?

gone-ot 12-21-2009 02:35 PM

...roof, because you're calculating the cars' "total frontal area."

Frank Lee 12-21-2009 03:09 PM

That ain't how it's been done.

Take published w x h x .8 for a commonly accepted frontal area estimate.

MetroMPG 12-21-2009 03:44 PM

Finding Cd is going to be tough. Little interest in that stat in the vehicle's target market.

As for A: a somewhat more involved method using a digital camera with a strong optical zoom:

http://ecomodder.com/forum/showthrea...l-area-82.html

Bow 12-21-2009 04:27 PM

Nice Link, Thanks

I found this on that Blueprint site in your thread:
http://www.the-blueprints.com/bluepr...egular-bed.gif

So it looks like:
H: 1615 mm / 25.4 = 63.58 In = 5.298 ft
W: 1690 mm / 25.4 = 66.54 In = 5.545 ft

63.58 x 66.54 x 0.8 = 3384.49 sq in

or

5.298 x 5.545 x 0.8 = 23.50 sqft

Frank Lee 12-21-2009 07:30 PM

Quote:

Originally Posted by Bow (Post 149240)

5.298 x 5.545 x 0.8 = 4.436 sqft

You might want to try that again.

Piwoslaw 12-22-2009 01:04 AM

I f you can't find numbers for the drag coefficient, then try coastdown testing. It's not really that hard once you find a good stretch of road and know what to pay attention to.

Bow 12-22-2009 07:46 AM

Quote:

Originally Posted by Frank Lee (Post 149292)
You might want to try that again.

23.50 sqft...

Tired brain/fat fingers... :eek:


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