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Old 12-21-2009, 12:08 PM   #1 (permalink)
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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?

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Old 12-21-2009, 12:29 PM   #2 (permalink)
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...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.
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Old 12-21-2009, 01:27 PM   #3 (permalink)
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Thank you sir!

Is that Roof height, or Hood height?
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Old 12-21-2009, 02:35 PM   #4 (permalink)
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...roof, because you're calculating the cars' "total frontal area."
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Old 12-21-2009, 03:09 PM   #5 (permalink)
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That ain't how it's been done.

Take published w x h x .8 for a commonly accepted frontal area estimate.
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Old 12-21-2009, 03:44 PM   #6 (permalink)
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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
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Old 12-21-2009, 04:27 PM   #7 (permalink)
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Nice Link, Thanks

I found this on that Blueprint site in your thread:


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
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Old 12-21-2009, 07:30 PM   #8 (permalink)
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Quote:
Originally Posted by Bow View Post

5.298 x 5.545 x 0.8 = 4.436 sqft
You might want to try that again.
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Old 12-22-2009, 01:04 AM   #9 (permalink)
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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.
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Old 12-22-2009, 07:46 AM   #10 (permalink)
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Quote:
Originally Posted by Frank Lee View Post
You might want to try that again.
23.50 sqft...

Tired brain/fat fingers...

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