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Old 06-07-2011, 12:48 PM   #143 (permalink)
California98Civic
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Join Date: Mar 2011
Location: Coastal Southern California
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Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
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Quote:
Originally Posted by brucepick View Post
Aero-wizards,

I'm pretty sure the idea here is for the rear edge of spoiler to meet the template curve. Right?

How about the slope of the spoiler, and it's front-to-rear dimension? Is any part of the spoiler that is forward of the template mostly inert, with little or no effect? Or is it helpful to extend it forward to or near the rear glass - that way very little air will flow into the cavity below the spoiler.

Going past the template line would be bad, right? Tuft testing should show turbulence there??

And, how about sloping it downwards? I think on a "normal" spoiler, that would cause unwanted lift . BUT if the forward edge is at or near the glass, wouldn't a downward rear slope help the flow reattach more smoothly?

Thanks!!
I'm not an "aero wizard" but I'll respond briefly. My tests confirm what some were suggesting: that the slope matters and that an upward angle risks counterproductive downforce. My designs were very close to (or on) the template line. I think turbulence can occur anywhere "under" the template. I think it is mainly a matter of how air is separating (poorly) from the passenger cabin at and around the rear window and the trunk area. That is my imperfect knowledge from this site and reading, so far.
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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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