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09-04-2007, 07:37 AM
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#1
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Registered Member
Join Date: Dec 2005
Posts: 4,223
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Calculate the Cd of your car - Instructable
via http://www.makezine.com/blog/ ...
Instructable: Measure the drag coefficient of your car
http://www.instructables.com/id/ELEE7STF5Y3TMFK/
Includes nifty MS Excel spreadsheet you can download and use to enter your own coastdown data.
The writer determined that for his 1992 Geo Metro ...
Cd = 0.370
Crr = 0.0106
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09-04-2007, 07:43 AM
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#2
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Registered Member
Join Date: Mar 2007
Posts: 812
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He's also a member on here too -- I thought he cross linked already 
__________________
Time is the best teacher. Unfortunately it kills all its students.
Bike Miles (Begin Aug. 20 - '07): ~433.2 miles
11/12
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09-04-2007, 07:50 AM
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#3
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Registered Member
Join Date: Dec 2005
Posts: 4,223
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Whoops. I must have missed that.
Who's the member? Must be using another name on GS vs Instructables.
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09-04-2007, 08:18 AM
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#4
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Registered Member
Join Date: Mar 2007
Posts: 812
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__________________
Time is the best teacher. Unfortunately it kills all its students.
Bike Miles (Begin Aug. 20 - '07): ~433.2 miles
11/12
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09-04-2007, 08:41 AM
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#5
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Registered Member
Join Date: Dec 2005
Posts: 4,223
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That's just weird. I actually used the Garage search tool to look for a 92 Metro (trying to see if the writer had registered his car here) before posting the link. None came up - yet there it is in iwilltry's garage sig/link.
Ah well.
A belated "hello", iwilltry! You know you've got one of the rare combos in a mk3 suzukiclone: 4 doors, 5 gears. The majority of 4-doors were sold as automatics.
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09-04-2007, 10:27 AM
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#6
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Registered Member
Join Date: Dec 2005
Posts: 4,223
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Quote:
Originally Posted by MetroMPG
The writer determined that for his 1992 Geo Metro ...
Cd = 0.370
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FYI, pretty close to Cd = 0.360 for a '92 Metro given here:
http://web.archive.org/web/200410240...drmayf/geo.htm
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09-04-2007, 01:27 PM
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#7
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Registered Member
Join Date: Mar 2006
Posts: 392
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I plugged the results of the coastdown test I did this spring on I-26 in the SC coastal plains into the formula (had to convert from my sec per 10mph drop to the spreadsheet's mph drop per 10 secs) and got a Cd of 0.18. I used the air density and Crr values given in the spreadsheet. To fine tune it better, I'll need to calculate my density altitude for 100 ft elevation, 78F, and 75% RH.
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09-04-2007, 04:34 PM
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#8
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Registered Member
Join Date: Dec 2005
Posts: 4,223
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Nice. Did you also use the spreadsheet's frontal (A)rea value?
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09-04-2007, 04:58 PM
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#9
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Registered Member
Join Date: Mar 2006
Posts: 392
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No, I couldn't find my car's frontal area listed anywhere on the web, so I measured my car's height (minus ground clearance) and average width and calculated its frontal area.
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