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Old 05-22-2014, 02:04 PM   #21 (permalink)
EcoModding Lurker
Join Date: Apr 2014
Location: Central OK
Posts: 24

Slow Silver - '09 Chevy Cobalt XFE Coupe
90 day: 37.56 mpg (US)

GMC pickup - '86 GMC C1500

Hephaestus - '09 Kawasaki Vulcan 900 Custom
90 day: 47.13 mpg (US)
Thanks: 1
Thanked 2 Times in 2 Posts
Originally Posted by aerohead View Post
* Also,it would lower the stagnation point which is very good for low drag and lift.Ideally,the nose would be vertical,or slightly canted backwards with the air dam integrated right into it.Just like NASCAR.You'd need to watch your approach angle clearance (16-degrees) so it doesn't scrub or worse.
*The rear backlight area is where the money is.The current 2nd-gen Insight has a fine contour to mimic.If you get the roofline up to 'Kamm' specs,then she's a candidate for tail,which should get you into 50-mpg territory.Easy.
For the nose bit, how do you mean vertical or canted backwards? I am picturing the opening at the lowest point being perpendicular or slightly negative angle respective of the horizontal. I mean with the upper and lower protrusions either equal or with the lower lip being a shorter length than the upper. I think I get that the stagnation point would be both lower to the road surface as well as have a smaller surface area, with most of the stagnation pressure being directed through the cooling system. especially with a proper air dam and/or splitter.
As for the rear glass (*backlight?) I found my old protractor and tried to remember how to use it. From a square side-view image of my model car it looks like the peak of roofline to the tail edge of the trunk is about 10*. What I am picturing is a curved sheet of clear what-have-you over the existing rear glass and extending to the tail edge of the low rise wind. Like the Insight.
*Would an extended fast back @10* and approximately 10" longer than my stock configuration give me enough benefit alone to justify it? Or would that only be worth it as prep for extending the overall tail Kamm?

I think the basic shape is a really good starting point as the front has fairly smooth transitions and the rear is raked noticeably.
Still think the most economical option is the undercarriage streamline. I just gotta use RACEcar principles without it looking like RICEcar handiwork!

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