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Old 01-07-2012, 07:11 PM   #5 (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 drmiller100 View Post
so, rise over run, both vertically and horizontally.

I am building a car, and want to keep the flow attached.
From the highest part of the car, I come back xx inches, and down yy inches.

Then I come back bb inches, and down cc inches.

If my car is 45 inches at the highest point, what are xx, yy, bb, and cc to be "safe".
For a project as intense as building a whole car, I think you would want to buy a copy of Hucho's "Aerodynamics of Road Vehicles" the "Bible" of so many on this site. I got a copy through ILL and photocopied key chapters I needed. With all the details you will want to consider, including stability, I imagine it would be very useful to have for ready, authoritative, reference. I think the rule for the slope after the point of highest camber in the roof is 11-14 degrees. The first generation Insight supposedly had both that angle and the taper about perfect for a production car. You could do worse than to imitate it, I imagine.
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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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