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Search: Posts Made By: jim-frank
Forum: Aerodynamics 02-10-2014, 11:11 AM
Replies: 36
Views: 9,095
Posted By jim-frank
The gripping force of magnets drops off too fast...

The gripping force of magnets drops off too fast with separation distance. Every time I passed a semi, the blast of wind would suck my hubcaps off. Perhaps if I were to glue magnets to both wheel and...
Forum: Aerodynamics 09-20-2012, 11:07 AM
Replies: 1
Views: 1,344
Posted By jim-frank
recent article on vortex generators

Scientists discover second purpose for vortex generators (http://phys.org/news/2012-09-scientists-purpose-vortex.html)

<quote>
When a golf ball, an airplane, or any solid object moves through the...
Forum: Aerodynamics 03-29-2011, 10:56 AM
Replies: 206
Sticky: CdA list
Views: 244,702
Posted By jim-frank
I suspected the wheels were a major drag source....

I suspected the wheels were a major drag source. I love the lines of the GT, but maybe some kind of mini deflectors ahead of the rear wheels and an air dam up front would be good for reducing drag...
Forum: Aerodynamics 03-28-2011, 11:01 AM
Replies: 206
Sticky: CdA list
Views: 244,702
Posted By jim-frank
Since I can't edit the wiki page, I'll put the...

Since I can't edit the wiki page, I'll put the data here. I just bought an Opel GT that I plan to ecomod thoroughly.

Make Model Year CD Frontal Area CDA
Opel ...
Forum: Hypermiling / EcoDriver's Ed 06-26-2008, 06:09 PM
Replies: 26
Views: 4,977
Posted By jim-frank
Keep in mind that the error is proportional to...

Keep in mind that the error is proportional to how much you put in the tank. In other words, an error of +/- 0.5 gallons will be 5% if you're putting in 10 gallons, as compared to 10% if you only...
Forum: Aerodynamics 05-13-2008, 06:12 PM
Replies: 36
Views: 9,095
Posted By jim-frank
Low budget aero hubcaps (magnet attachment)

I bought four steel pizza pans from my local dollar store, and superglued neodymium magnets to them in a location that centers the cap on my wheels.

I first drilled and then reamed a hole to fit...
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