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Old 11-18-2011, 03:42 PM   #10 (permalink)
Geo Metropolis
Enthusiastic EcoModder
 
Join Date: Dec 2010
Location: San Diego
Posts: 90

Gnatmobile - '96 Geo Metro LSI
90 day: 44.68 mpg (US)

theRAV - '01 Toyota RAV4 NV
90 day: 21.07 mpg (US)

ACCELICA - '95 Toyota Celica GT Convertible
Last 3: 23.46 mpg (US)

The Van - '05 Chevrolet Uplander LS LWB
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Kammback 2.0 - optimized

Thanks everyone for helping me understand the ideal shape better. I printed a picture of the car with the ideal teardrop slope then cut it out with scissors. To optimize the Kamm I simply stood to the side of the car closed one eye, then held the cutout at arm's length, lining it up so it eclipsed my view of the car. I then simply adjusted the Kamm's angle until it matched that of the cutout.
I'll take better pictures from more angles to better illustrate the Kamm construction but for the purpose of this thread these pictures should be helpful:
Below you can see the new Kamm, then the half teardrop overlaying the car lined up along the groundplane so that the highest roofpoint is the highest of the template. Looks pretty spot on

Check out my fuel log for the latest tank which had the optimized kamm for only the last 100 miles or so. Set a personal best range record and FE record!
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Last edited by Geo Metropolis; 11-18-2011 at 03:47 PM..
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aerohead (11-19-2011), California98Civic (11-19-2011)