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Author Topic: Coast Down Test  (Read 2589 times)

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Offline DKrause615

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Coast Down Test
« on: October 04, 2012, 07:50:22 AM »
A couple years ago there was a link on this forum to a formula that used coast down data to calculate approximate coefficient of aero drag (CD)  The link no longer works.

This year at speed week I had two runs that I shut down at mile 4 and coasted untill mile 5.  I have the speed loss and time in seconds.  Does any one know how to apply this data to approximate CD?
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Offline WOODY@DDLLC

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Re: Coast Down Test
« Reply #1 on: October 04, 2012, 08:53:02 AM »
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All models are wrong, but some are useful! G.E. Box (1967) www.designdreams.biz

Offline Schruiber

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Re: Coast Down Test
« Reply #2 on: October 04, 2012, 09:49:02 AM »
I was looking for it the other day too to have my High School Eco car students set-up a coast down test.  The xls is great, thank you.
Michael
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T-2011 - Granite Falls HS UrbanAutos Diesel - 31.16668MPH over the measured mile  at WoS 2011.

Offline DKrause615

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Re: Coast Down Test
« Reply #3 on: October 09, 2012, 09:02:30 PM »
Thanks Woody.  .29 in a Mustang FALT seems about right.  Sure wish I knew how to legally improve on that! :-)
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