Thread: SUV Kammback
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Old 09-29-2014, 08:12 PM   #38 (permalink)
UnicycleDan
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Join Date: Jul 2014
Location: Cleveland, Ohio
Posts: 20

BigBlue (UnicycleDan) - '03 GMC Envoy XL
90 day: 20.55 mpg (US)
Thanks: 13
Thanked 3 Times in 2 Posts
Quote:
Originally Posted by freebeard View Post
If the mileage isn't panning out, how does it feel? Any difference when you meet/pass a big truck (cattle trucks are the worst, ask aerohead)?
I didn't pass any big trucks during testing, and I don't know whether it was just me wanting it to be true, but the acceleration felt a little easier up to 65. I'll continue testing, then, trying to start the panels at a better spot and increase angles further, keeping attached (but turbulent) flow.

Quote:
Originally Posted by freebeard View Post
Your vehicle already has a Kamm-back, you're wanting to return it to a partial boattail.
I don't understand what you mean by this. My car chops off almost parallel with the direction of motion of the car on all sides. There is little curving back inward that the sides or top do before the back cuts off. I don't think my stock car would be considered a Kammback, if that's what you mean.

Quote:
Originally Posted by freebeard View Post
One of my favorite cars, the Volkswagen Golf GTI w12 650. The Golf is a Kamm-back, like yours, but this has been converted to a bubble-top coupe with only the skeleton of the original top left.
Cool car, but I'm not planning to chop or alter my stock car in any way, just add removable attachments.

Quote:
Originally Posted by freebeard View Post
The wheel wells and underbody (diverter and difusser) offer as much opportunity as your 30% tail.
Underbody work will come, too; all in good time. I've been trying to go for the hardest problem first (and my hope was the biggest payoff).
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"On the 8th day, God created kammbacks. And God saw that it was good."
-Genesis 1:32
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