12-21-2009, 01:08 PM
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#1 (permalink)
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Old School Hashiriya
Join Date: Dec 2009
Location: Yuma, AZ
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Fred - '98 Nissan Frontier XE 90 day: 26.57 mpg (US)
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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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Bow
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12-21-2009, 01:29 PM
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#2 (permalink)
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...beats walking...
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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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12-21-2009, 02:27 PM
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#3 (permalink)
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Old School Hashiriya
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Fred - '98 Nissan Frontier XE 90 day: 26.57 mpg (US)
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Thank you sir!
Is that Roof height, or Hood height?
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Bow
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12-21-2009, 03:35 PM
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#4 (permalink)
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...beats walking...
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...roof, because you're calculating the cars' "total frontal area."
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12-21-2009, 04:09 PM
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#5 (permalink)
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(:
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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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12-21-2009, 04:44 PM
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#6 (permalink)
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Batman Junior
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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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12-21-2009, 05:27 PM
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#7 (permalink)
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Old School Hashiriya
Join Date: Dec 2009
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Fred - '98 Nissan Frontier XE 90 day: 26.57 mpg (US)
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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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Bow
Last edited by Bow; 12-22-2009 at 08:45 AM..
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12-21-2009, 08:30 PM
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#8 (permalink)
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(:
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Quote:
Originally Posted by Bow
5.298 x 5.545 x 0.8 = 4.436 sqft
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You might want to try that again. |
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12-22-2009, 02:04 AM
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#9 (permalink)
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aero guerrilla
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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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12-22-2009, 08:46 AM
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#10 (permalink)
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Old School Hashiriya
Join Date: Dec 2009
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Fred - '98 Nissan Frontier XE 90 day: 26.57 mpg (US)
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Quote:
Originally Posted by Frank Lee
You might want to try that again.
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23.50 sqft...
Tired brain/fat fingers... 
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