Comments on: Measure the drag coefficient of your car http://www.iwilltry.org/b/how-to-measure-the-drag-coefficient-of-your-car/ Climate change is real. You're causing it. You can stop it. Will you try? Wed, 01 Feb 2012 12:51:02 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Rob http://www.iwilltry.org/b/how-to-measure-the-drag-coefficient-of-your-car/comment-page-1/#comment-5961 Rob Wed, 05 May 2010 23:41:09 +0000 http://www.iwilltry.org/b/?p=586#comment-5961 This article was originally posted on another site. Here are the original comments. <strong>Justin said ... 14:04, 5 May 2009 (PDT)</strong> Is there a way to figure out the drag coefficient of car without driving it ? <strong>Rob said ... 15:39, 5 May 2009 (PDT)</strong> Yes. Put it in a wind tunnel and measure the force as a function of wind speed. But if you don't have a wind tunnel you have to drive it. <strong>Dave said ... 12:27, 20 January 2010 (PST)</strong> Thanks for posting this. Do you know if there is an official standard such as from SAE or ISO for conducting this type of vehicle coastdown rolling resistance test? <strong>Ari Giller said ... 13:10, 24 February 2010 (PST)</strong> Yes! Check out SAE J2263 "Road Load Measurement Using Onboard Anemometry and Coastdown Techniques." There is another good pdf on the external links sections of the "rolling resistance" wiki page. <strong>SATYAJIT said ... 21:49, 28 April 2010 (PDT)</strong> very well explained.. and thanks for this article.. <strong>Giant said ... 19:45, 3 May 2010 (PDT)</strong> Rob, unless you have a really nice Wind tunnel, you will not have a moving ground or boundary layer suction devices. The Wheels rotating changes everything. We are testing our race car in CFD->Wind Tunnel->Coastdown tests to get an accurate Cd. This article was originally posted on another site. Here are the original comments.

Justin said … 14:04, 5 May 2009 (PDT)
Is there a way to figure out the drag coefficient of car without driving it ?

Rob said … 15:39, 5 May 2009 (PDT)
Yes. Put it in a wind tunnel and measure the force as a function of wind speed. But if you don’t have a wind tunnel you have to drive it.

Dave said … 12:27, 20 January 2010 (PST)
Thanks for posting this. Do you know if there is an official standard such as from SAE or ISO for conducting this type of vehicle coastdown rolling resistance test?

Ari Giller said … 13:10, 24 February 2010 (PST)
Yes! Check out SAE J2263 “Road Load Measurement Using Onboard Anemometry and Coastdown Techniques.” There is another good pdf on the external links sections of the “rolling resistance” wiki page.

SATYAJIT said … 21:49, 28 April 2010 (PDT)
very well explained.. and thanks for this article..

Giant said … 19:45, 3 May 2010 (PDT)
Rob, unless you have a really nice Wind tunnel, you will not have a moving ground or boundary layer suction devices. The Wheels rotating changes everything. We are testing our race car in CFD->Wind Tunnel->Coastdown tests to get an accurate Cd.

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