+1 for ABS. Easy to cut. Easy to form with a heat gun. Easy to glue with ABS pipe glue. Good stuff for the DIYer that doesn't have a great shop to work with metal. You can easily make your own inlet or outlet vents/louvers in the ABS to move air in or out to help with the cooling issues.
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Originally Posted by the_man
(Post 366481)
While it may get dented up, it's underneath a low-slung car, so I put aesthetics on the back burner. :D
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Originally Posted by mazda/nissan
(Post 366574)
yes, but dents are less aerodynamic than a smooth surface
(couldn't find any Homer Simpson speed hole pictures... so you get this.) http://dotnetworkaholics.com/images/...rdFishCar1.jpg |
It's the car from Swordfish....is that John Travolta's very own?
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Originally Posted by Splitime
(Post 366577)
Tell that to a golf ball ;)
(couldn't find any Homer Simpson speed hole pictures... so you get this.) http://dotnetworkaholics.com/images/...rdFishCar1.jpg very cool stuff. |
So who's got a hot car with a junker body on it? Ball peen that biotch everywhere. Let us know about the results!
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yes, but the space shuttles have flat surfaces, and they go really fast :dunno:
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Maybe dimples only help golf balls because they spin?
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Originally Posted by johndoe
(Post 367117)
Maybe dimples only help golf balls because they spin?
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agian, not an expert. The stuff I read though implied that it was only benificial to keeping the boundry layer attached on a steeply dropping off trailing edge. it was also implied that the resulting smaller low pressure wake was the only reason that drag was reduced. so the increased drag on the leading edges was more than offset by the smaller wake produced.
I'm going to make an assumption here and it may be off base, but I'm pretty sure that it's correct. if you look at the MR? version of the evo 8 there are vortex generators along the top of the steeply sloped rear window. I believe these were put there to keep the boundry layer attached further down the window to adjust the wake in such a manner to make the rear wing more effective. |
Originally Posted by dynokiller90
(Post 367249)
agian, not an expert. The stuff I read though implied that it was only benificial to keeping the boundry layer attached on a steeply dropping off trailing edge. it was also implied that the resulting smaller low pressure wake was the only reason that drag was reduced. so the increased drag on the leading edges was more than offset by the smaller wake produced.
I'm going to make an assumption here and it may be off base, but I'm pretty sure that it's correct. if you look at the MR? version of the evo 8 there are vortex generators along the top of the steeply sloped rear window. I believe these were put there to keep the boundry layer attached further down the window to adjust the wake in such a manner to make the rear wing more effective. |
Originally Posted by mazda/nissan
(Post 367251)
I saw a subaru today that looked like it had a small wing at the very edge of the roof-line, but it was parallel to the back glass, like it was trying to catch air coming over the car, push it down the back glass, and into the spoiler
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laminar flow has a lot of shear in it. it's like a deck of cards being slid on a table--the top one moves over the next one and so on. turbulent flow (at high reynolds numbers) can actually work more like little vortex ball bearings and lower the flow drag of a body.
the stitches on a baseball are to hold it together. but! they are very tightly regulated on official balls. same number and spacing requirements... they do make a difference to pitchers, but they are a design consequence, not the other way around. golf balls do have dimples to reduce drag. but they also have them to induce lift... backspin creates a pressure differential from top to bottom and helps the ball maintain hangtime. supersonic jets also have devices to create turbulence along the wing surface. and check this out... even super efficient cars steal this technique. http://www.got.net/~davidbu/davidbu/sparrow/costco.jpg |
damn hippies and their carrots...
it is difficult to find pictures of the bottom of the LMP1 cars, I have a link at the house that I will put up where someone got pictures of the cars up in the air in the paddock, showing all its underbits :) |
hippies dont shop at costco...
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note that the dimples on that car are on the trailing edge of the fender only. very cool.
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1 Attachment(s)
I just bought an Elise mid body undertray and rear diffuser. Aluminum parts. The undertray has Naca ducts in it for transmission and exhaust cooling. Going to try to retrofit these to the Miata. The parts used were cheaper than buying aluminum sheet to fab myself! Here's a pic over at CR that shows what the diffuser looks like on a Miata.
Attachment 207518 |
Originally Posted by mazda/nissan
(Post 366574)
yes, but dents are less aerodynamic than a smooth surface
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Originally Posted by cueball1
(Post 380546)
I just bought an Elise mid body undertray and rear diffuser. Aluminum parts. The undertray has Naca ducts in it for transmission and exhaust cooling. Going to try to retrofit these to the Miata. The parts used were cheaper than buying aluminum sheet to fab myself! Here's a pic over at CR that shows what the diffuser looks like on a Miata.
http://i54.photobucket.com/albums/g1...rche250013.jpg |
^^ agreed.. How much for the lotus piece?
Lots of good info/links in here, subscribed. |
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