06-23-2014, 07:50 PM
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#1 (permalink)
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EcoModding Lurker
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My Kamm back
What  do you guys think about it.. Should it be higher?
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 Today
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06-23-2014, 08:15 PM
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#2 (permalink)
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Master EcoModder
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hard to say
Quote:
Originally Posted by counterbond
What do you guys think about it.. Should it be higher? |
We would need a side shot of the car to compare it with the template.
Here is a link to the template Aerodynamic Streamlining Template
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06-23-2014, 08:18 PM
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#3 (permalink)
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The Dirty330 Modder
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i request a more side pic of the whole car as it sits now. Not an angled pic like this one. I want this so i can put the aero template to it and see how good it is. either way it should be an improvement.
or it can be done yourself
Aero Template Overlay ver.0.6-alpha
just align the "0" to the tallest part of your car
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"The only real mistake is the one from which we learn nothing."
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06-23-2014, 08:18 PM
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#4 (permalink)
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Spaced out...
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Not sure how long the tape will hold up but I'm very interested to see your results. Did you rivet the sides right to the body?
How did you get the plexiglass skirts to flex out at the front to clear the lower half of the wheel/tire?
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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06-24-2014, 04:38 PM
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#5 (permalink)
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Master EcoModder
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edge radii
Your headed in the right direction,and as soon as we get an image we 'll be able to tell about the downslope.
One thing I want to mention is that these rooflines need some softened edges where the roof and sides come together.With a hard intersection they're prone to create longitudinal vortices which have remarkably high drag.
Here's an image of Kamm's personal car and one of his wind tunnel models with the hard edges.You can see the tufts 'flying' into the vortices,the whole length of the car. 
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06-25-2014, 09:10 AM
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#6 (permalink)
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Rat Racer
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A fitst step, however ugly, is better than not taking the step. Like 99% of us. Great job, I can't wait to see how it gets over time!
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Quote:
Originally Posted by sheepdog44
Transmission type Efficiency
Manual neutral engine off.100% @∞MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%
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06-25-2014, 01:29 PM
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#7 (permalink)
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Master EcoModder
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Quote:
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What do you guys think about it.. Should it be higher?
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Do you plan on changing it? Absent the requested side view, I'd say "Not higher—longer." It appears to be sway-backed, The center could be a few inches higher making a convex curve. Lay a flexible strip on the roof and let it sag to the 12° angle and follow that.
Notice the way Redneck handled the rear wheelwells on his Geo XL1, smoothing over the wheel arch and bumper.
How stiff is the clear material you used (I assume that rectangle on top is clear as well)? If it vibrates, that is unhelpful.
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06-25-2014, 08:14 PM
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#8 (permalink)
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EcoModding Lurker
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The Following User Says Thank You to counterbond For This Useful Post:
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06-26-2014, 04:31 PM
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#9 (permalink)
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Master EcoModder
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Kamm back
Quote:
Originally Posted by counterbond
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counterbond,you're on the right track.Here is a drag table from Hucho's optimization study of the 1st-gen Golf/Rabbit.The Golf happens to hit a drag minimum up near the 'Template'.VW was not allowed to build like this,as it violated Giugiaro's 'styling',although,you can see that we had to wait quite a while to see a VW with drag as low as the 1974 results.
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06-26-2014, 10:13 PM
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#10 (permalink)
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Master EcoModder
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Here's what I meant by "lay a flexible strip on the roof". I used 16' long wood strips because I was interested in the windshield area as well.
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