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Old 04-10-2009, 09:55 AM   #26
BacDoc
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I'm in love.
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Old 04-10-2009, 09:59 AM   #27
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something something golf balls aren't flat for a reason something something....

seriously, when will someone dimple an entire car?

IBhailstorminthemidwest
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Old 04-10-2009, 09:59 AM   #28
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so what if this vinyl wrap was made out of...carbon fiber???


would the drag get reduced to 0? Perpetual motion like effect?


I THOUGH IF IT FIRST!!
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Old 04-10-2009, 10:01 AM   #29
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aerodynamics of a golf ball and a car are very different.

Carmakers could get a significant improvement just from covering the underside of the vehicle.
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Old 04-10-2009, 10:03 AM   #30
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Quote:
Originally Posted by vapore0n View Post
so what if this vinyl wrap was made out of...carbon fiber???


would the drag get reduced to 0? Perpetual motion like effect?


I THOUGH IF IT FIRST!!
You sure did. I wish I though if it.
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Old 04-10-2009, 10:04 AM   #31
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Anyone else get a virus/malware warning visiting that site?


(I'm running Avast)


Last edited by Reflex-Arc; 04-10-2009 at 10:06 AM. Reason: screengrab
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Old 04-10-2009, 10:08 AM   #32
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Originally Posted by Reflex-Arc View Post
Anyone else get a virus/malware warning visiting that site?


(I'm running Avast)

you should tarp your modem for faster virus catching
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Old 04-10-2009, 10:11 AM   #33
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Originally Posted by CalcVictim View Post
you should tarp your modem for faster virus catching
It's a tarp!
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Old 04-10-2009, 10:13 AM   #34
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I think Avast is just flagging the iframe. Iframes are easily exploited.
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Old 04-10-2009, 10:21 AM   #35
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Golf balls aren't dimpled for aerodynamic sleakness.... they are dimpled to be able to hook or slice in the air, and grip and spin on the green. This concept fails.
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Old 04-10-2009, 10:23 AM   #36
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the whistles go woo woooooooooo
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Old 04-10-2009, 10:30 AM   #37
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Quote:
Originally Posted by Aprice40 View Post
Golf balls aren't dimpled for aerodynamic sleakness.... they are dimpled to be able to hook or slice in the air, and grip and spin on the green. This concept fails.
Actually it's because they use backspin & drag to generate lift.

We just need a car with a treadmill skin to generate massive downforce.
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Old 04-10-2009, 10:32 AM   #38
volume311
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Golf Ball Dimples
Quote:
Firstly, the dimples delay separation of the boundary layer from the ball. Early separation, as seen on a smooth sphere, causes significant wake turbulence, the principal cause of drag. The separation delay caused by the dimples therefore reduces this wake turbulence, and hence the drag.
The key in all this is the boundary layer.
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Old 04-10-2009, 10:33 AM   #39
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Originally Posted by fliz View Post
We just need a car with a treadmill skin to generate massive downforce.
So an upside-down tank should be pretty aerodynamic, right?
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Old 04-10-2009, 10:39 AM   #40
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This is not a new idea. I've seen strips of dimpled material used as a trip spoiler on the airfoils of gliders to improve their efficiency. Glider people don't mess around when it comes to aerodynamics.
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Old 04-10-2009, 10:44 AM   #41
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Looks like dimples to me.


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Old 04-10-2009, 10:56 AM   #42
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I so want a matte vinyl job on my V.
Like this?




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Old 04-10-2009, 11:02 AM   #43
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i kinda thought it'd be cool, but that looks like ass.
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Old 04-10-2009, 11:08 AM   #44
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Woof, that looks not so good on a stock CTS.
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Old 05-11-2009, 12:58 PM   #45
teh POD
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bump for great justice



http://www.popularmechanics.com/auto...s/4316702.html

Quote:
Originally Posted by PopMech
Fastskinz Test Drive: Can a Golf Ball Covering Shed MPGs?

The mounting pressure from legislators to improve fuel economy means automakers are sweating the details to eke out all the miles per gallon they can get. Every system on a new vehicle is optimized to return the best fuel economy, given the available technology and that vehicle's specific mission. So finding mpg improvements with simple devices from outside the vast engineering tech labs of the major automakers and suppliers is difficult. We've debunked plenty of fuel-economy gadgets that have made big promises and simply didn't deliver. But none of the devices we've tested so far has addressed aerodynamics. Hypermilers and ecomodders have proven that you can indeed improve on OEM automotive aerodynamics, if the modifications are done correctly and you're willing to make some very large sacrifices in style and certain performance parameters. But what about a relatively nonevasive aero improvement? Could a vehicle wrap designed to mimic the dimpled surface of a golf ball improve fuel economy?

By Ben Stewart

Published on: May 11, 2009

Fastskinz MPG-Plus is a vinyl vehicle-wrap system that uses closely spaced shallow dimples with about a 5-mm diameter. Every painted surface on the vehicle is wrapped and, according to the company, it improves aerodynamics and fuel efficiency. The idea sounded promising. We went in optimistically skeptical.

Since the early 20th century, golf ball makers have known that small irregularities—dimples—on the surface of balls created longer and truer drives than balls with smooth surfaces. In short, the dimples help delay the airflow separation from the ball and create a smaller wake of air behind, so there's less drag. "A golf ball is a bluff body and most of the drag is due to airflow separation—the flow cannot close behind the ball and stay attached," says Steve Ogg, vice president of golf ball research and development for Callaway. "The dimples transition the flow from a smooth laminar state to chaotic turbulent state. The turbulent mixing increases the momentum of the air at the surface of the ball, allowing it to stay attached longer." A car is obviously not the same type of shape as a golf ball, but the idea behind MPG-Plus is that dimples on a car body could have a similar effect. In automotive aerodynamics, the surface of the car is "dealing with turbulent flow," says Bill Pien, supervisor of aerodynamics in Ford Vehicle Engineering. "In normal operation, the skin friction accounts for no more then 1 percent of the total drag since the main drag generation mechanism is the vehicle shape," he says.

Fastskinz thinks there is still efficiency to be gained. They claim that the improved fuel economy of a vehicle wrapped in MPG-Plus compared with an identical vehicle not wrapped is 18 to 20 percent. A 20 percent fuel-economy bump would certainly be impressive, but such tests have been done before. "We had experimented with the sharkskin wrap in the mid 80s when we developed a low-drag Probe IV concept car which had a Cd of 0.15," Pien says. (Cd, or coefficient of drag, is the ratio of the drag force to the force produced by the dynamic pressure times the area measured.) "We did not see improvements in drag so we moved on to work with the vehicle shape."

In view of the skepticism and past research, we decided to do our own fuel-economy testing.

We took delivery of two identical 2009 Ford Flexes—both all-wheel-drive and equipped in the fully loaded Limited trim level. Even the miles logged on each vehicle were similar—around 8000 at the beginning of the test. The Fastskinz crew wrapped one of them with MPG-Plus, and the other one was left stock. Before hitting the road, we set the tire pressure in both vehicles to the factory-recommended 35 psi cold and precisely filled each Flex with a full tank of fuel.

Our usual fuel economy loops in Southern California use a variety of roads and conditions with varied speed limits to best represent real-world driving. But for this test, aerodynamics would determine if MPG-Plus improved fuel economy, so we stuck to freeway speeds. Consistency both in driving style and vehicle speed was crucial. So we locked both cars on cruise control at a constant speed (55 to 65 mph depending on the traffic conditions) as often as possible and switched drivers every 60 to 80 miles.

Along the way, we periodically checked the fuel-economy readout on the dash display of both vehicles. At 139.9 miles, the Fastskinz Flex was returning 27.2 mpg while the unwrapped Flex showed 28.4 mpg. At 271.1 miles, the Fastskinz Flex was delivering 23.7 mpg and the unwrapped Flex showed 24.1 mpg. We drove until the gaslight glowed in both cars, which turned out to be 430 miles. Back at the gas pump, we filled each Flex in the same manner we did that morning. The Fastskinz Flex returned 24.52 mpg and the unwrapped Flex returned 24.55 mpg. The dash display read 24.8 mpg in the Fastskinz Flex and 25.6 mpg in the unwrapped Flex.

Essentially, in our test, we found no real fuel-economy improvement from the Fastskinz MPG-Plus wrap. And if you trust Ford's MPG displays, the Fastskinz Flex actually delivered slightly worse fuel economy on our loop. So two identical vehicles, on an identical route at identical speeds, with the same drivers, on the same day, returned nearly the same fuel economy. Where did MPG-Plus go wrong?

For one thing, wrapping a full vehicle is overkill. There might be better effects on a vehicle-by-vehicle basis, Pien says, but to get this to work, one needs to test the wrap on specific vehicles in the wind tunnel and spend the time to evaluate placement locations that are troublesome from an aerodynamic perspective for that vehicle. Still, even with a perfect wrap, the mpg benefit will likely be marginal. "You just cannot wrap the car from front to the rear and expect huge fuel-economy improvement," Pien says. Callaway's Ogg agrees. "They're just gambling that there are enough locations where there's some laminar separation—that they can roughen the surface and keep the flow attached," he says. " Where the flow is already turbulent, the dimpled skin is more likely to have a negative impact—they need to be selective in their choice of locations on the vehicle for application of the skin," Ogg says.

Fastskinz's main claim to mpg savings comes from a land-speed-record-holding motorcycle that is wrapped in MPG-Plus. "I had a consistent 3-mph gain on top speed at the end of one mile," the rider, Leslie Porterfield, wrote on the company's blog. "I put a second rider on the bike and did bodywork changes, with the same result," he writes. "On my Hayabusa, I also noticed a change in the way it behaved. Normally at speeds at and above 200 mph, the top of my windscreen would flex considerably." Improving aerodynamics on a motorcycle traveling at extreme speeds is a distinctly different problem than improving aero on a car or truck traveling at freeway speeds. For one, the shape of the bike's nose is closer to that of a golf ball. "I think the wrap could work best on objects that are semibluff—on a motorcycle that's been flared over (streamlined) traveling at very high speeds," Ogg says. "It could work, but only a small portion of the surface would need the dimple skin applied."
Epic fail
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Old 05-11-2009, 01:03 PM   #46
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Quote:
The dash display read 24.8 mpg in the Fastskinz Flex and 25.6 mpg in the unwrapped Flex.
so, the weight of it made it worse then?
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Old 05-11-2009, 01:11 PM   #47
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doesn't the natural orange peel in paint already create dimples? the surface of today's paint isn't the equivelant of a glass surface...
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Old 05-11-2009, 01:19 PM   #48
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Quote:
Originally Posted by 640k View Post
doesn't the natural orange peel in paint already create dimples? the surface of today's paint isn't the equivelant of a glass surface...
nice...finally something positive about orange peel paint
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Old 05-11-2009, 01:21 PM   #49
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Speed holes!
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Old 05-11-2009, 01:23 PM   #50
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Quote:
Originally Posted by BacDoc View Post
I hate black on black wheels.
Who are you, George W. Bush?
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