Thread: Belly Pan Build Thread - Insight Gen 1
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Old 04-02-2018, 06:38 PM   #9 (permalink)
California98Civic
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Quote:
Originally Posted by brucepick View Post
It took me a while to figure out that graph. Soooo...

Since my Insight is an aerodynamically shaped hatchback I use curve "a".
If my diffuser has a slope of 7.5° compared to the previous section's slope, the diffuser would have zero effect on overall Cd. If the slope is 10° different, Cd goes up by about .008. Whew.

Is that right?
Yup. Three degrees is .02 reduction in Cd.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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