Kammback yields +4 mpg - Fuel Economy, Hypermiling, EcoModding News and Forum

gascort · 07-11-2009, 01:45 AM

I got 55 mpg highway with it versus 51 mpg without.
Full details and photos on my blog, note the awesome new EM decals!
Scientific Method meets Fuel Economy: Kammback

Christ · 07-11-2009, 01:58 AM

Not bad... not bad at all.

orange4boy · 07-11-2009, 02:25 AM

Nice looking bubble! I like your simple but effective fabrication.

You have an escort/pacer hybrid started.

I've been dying to do this for the egg but I'm too busy at the moment and can't justify it because I do so little highway driving.

Just play "Stand by Your Man" by Patsy Klein.

Living vicariously...

alohaspirit · 07-11-2009, 02:54 AM

two

up

Piwoslaw · 07-11-2009, 03:02 AM

Wow, that looks good, Gascort

Have you coastdown tested it yet? I wonder what the effect on Cd is?

The bubble sticks out so far behind the bumper that I'd advise you to put some red reflective tape on the back. Not everyone pays attention, unfortunately.

cfg83 · 07-11-2009, 03:48 AM

gascort -

Fantastic job! How thick is the plexiglass? It seems "thin enough" to bend really well. Is it bending from the bolts or did you have to heat it?

CarloSW2

bondo · 07-11-2009, 08:42 AM

Excellent fabrication gascort. Smart solution to reducing the turbulent wake of your car without losing rearward visibility or the functionality of the hatch.

Bondo

Daox · 07-11-2009, 09:42 AM

VERY nice! I love it.

McTimson · 07-11-2009, 11:23 AM

That looks awesome!

The way it's mounted reminds me of bicycle racks that strap onto the trunk - so maybe this could double as a bicycle rack. I would guess the 1/2" conduits probably aren't strong enough to support too much weight though.

gascort · 07-11-2009, 11:42 AM

Quote:

Originally Posted by Piwoslaw

Wow, that looks good, Gascort

Have you coastdown tested it yet? I wonder what the effect on Cd is?
The bubble sticks out so far behind the bumper that I'd advise you to put some red reflective tape on the back. Not everyone pays attention, unfortunately.

Thanks!!
In part of my test route there is a huge hill. It's on my commute and my goal is to be able to EOC the whole way down without losing speed.

When I tested it yesterday, I coasted (on average) more than twice as far before dropping 5 mph than without. On one trial I tripled the length!
...
I do have reflectors/red LEDs planned. Good point!