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Originally Posted by Old Tele man
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I do not think that I am especially smart, but I find this diagram to be extremely insulting, sufficient to close the thread in and of itself. The windshield does not create a straight wall of air that extends into space, I will later post something more reasonable, based on my limited understanding. Also, I cannot imagine that any glorified gift wrap will make any shape aerodynamic in and of itself.
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According to the company’s tests, which have ranged from everyday driving to NASCAR wind-tunnel testing and setting records at the Bonneville Salt Flats, FastSkinz can boost efficiency by 18 to 25% depending on type of drivetrain. A local Dallas blogger went for a ride in one of the test vehicles and had this to report:
“Peter notes that the EPA’s site says the Scion in question should be getting 22 city driving and 28 highway. On Monday, we were getting about 28 with stop-and-go, 34 on the highway. He says he’s been seeing 27-29 city, 32-35 highway.”
This is despite the fact that the EPA’s MPG estimates tend to be quite generous and forgiving.
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Wouldn't an 18-25% increase indicate a 36-50% decrease in drag?
Generous and forgiving? How come most of us routinely beat it?
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Originally Posted by Frank Lee
Many EM Fastskinz posts...
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Originally Posted by MetroMPG
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That thread is closed.
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Originally Posted by aerohead
There is nothing theoretical about boundary layers.This is a fully mature element of the science of fluid mechanics,demonstrated time and time again with peer-reviewed analysis.
If MythBusters demonstrated a drag reduction it cannot be attributed to the drag reduction effect associated with the dimples on a golf ball.
Smooth automobiles already operate at super-critical Reynolds number with turbulent boundary layer without any aid from tripping devices.
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http://ecomodder.com/forum/showthrea...tml#post332378
Next post:
Quote:
Originally Posted by ChazInMT
Keep in mind a golfball is a small spinning sphere in open air, a car is a lumpy shaped object moving along with solid ground 3 to 12 inches away. These facts make a huge difference in what the air does in relationship to their passage.
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Originally Posted by 2000mc
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It works!
Oh wait...
The other one...
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Originally Posted by ecomodded
Using the Giant myth buster size dimples negates any effect in my opinion and is probably the reason mpg went down in their tests. They increases cd with the larger bumpier surface area. Destined to fail using their tests conditions.
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Mythbusters showed a 10% improvement of the car with modeling clay, but no dimples, to the car with dimpled modeling clay, and the dimples in a crate on the back seat. There are enough criticisms of their "scientific testing" on this site, but I think that their problems were elsewhere.