Anyone have 800 Lbs of clay handy? New mythbusters episode

donee · 11-07-2009, 01:59 PM

Hi All (again),

So where does one place dimples on a Prius? Hard to say. Possibly nowhere. If the flow is laminar down the rear glass, then turbulence will increass drag.

I think some sorta difusher plate from the lowest reach of the rear axle, to the rear bumper skirt , with dimples would be good. That area is poor aerodynamically, I think.

I noticed the other day, (as I have not cleaned my car lately) that I am getting an accretion of stuff just forward of the rear gas cap about 9 inches high, in line with the door handles and between the rear door and the fuel filler door. This apparently is the speration point for the flow on my car. Remember, it might be the same on your car, as I have the flush hubcaps and turbulators on the rear-view mirrors and A-pillar. Now, this is where the car starts to sweep up to the meet the narrower tail. Could dimples behind the rear door opening, at that level help? Or maybe a turbulator behind the rear door handle? Or possibly filling the door handle dimples with foam rubber? Again all hard to say. Is this air coming out from under the car? Could side damns get rid of it ? Could filling in the rear wheel openings get rid of it? Its too complicated for me!

dogfriend · 11-07-2009, 02:03 PM

Quote:

Originally Posted by donee

Could dimples behind the rear door opening, at that level help? Or maybe a turbulator behind the rear door handle? Or possibly filling the door handle dimples with foam rubber? Again all hard to say. Is this air coming out from under the car? Could side damns get rid of it ? Could filling in the rear wheel openings get rid of it? Its too complicated for me!

You need to get together with rrolf. He has a wind tunnel in his backyard.

a64pilot · 11-08-2009, 02:09 PM

If your serious, you don't need a wind tunnel, all you need is a ball of yarn and a roll of scotch tape. A video camera is helpful though.
The illustrated guide to aerodynamics - Google Books
Read the part on tufting. The easiest way to tuft is to pull a long piece of yarn the entire length, tape it every six inches or so and cut after taping. The yarn will show exactly where turbelent airflow begins

hyo silver · 11-11-2009, 01:17 PM

Quote:

Originally Posted by dogfriend

You need to get together with rrolf. He has a wind tunnel in his backyard.

And I have plans to build one in my basement. But then, I have plans for many things that have yet to happen.

dogfriend · 11-11-2009, 03:54 PM

Quote:

Originally Posted by hyo silver

I have plans for many things that have yet to happen.

Me too.

11-07-2009, 01:59 PM	#71
donee Senior Member Join Date: Aug 2005 Location: Chicagoland Posts: 2,244 My Car: 2006 Prius Model: Package: #2 Thanks: 2 Thanked 54 Times in 47 Posts Friends: 0	Re: Anyone have 800 Lbs of clay handy? New mythbusters episode Hi All (again), So where does one place dimples on a Prius? Hard to say. Possibly nowhere. If the flow is laminar down the rear glass, then turbulence will increass drag. I think some sorta difusher plate from the lowest reach of the rear axle, to the rear bumper skirt , with dimples would be good. That area is poor aerodynamically, I think. I noticed the other day, (as I have not cleaned my car lately) that I am getting an accretion of stuff just forward of the rear gas cap about 9 inches high, in line with the door handles and between the rear door and the fuel filler door. This apparently is the speration point for the flow on my car. Remember, it might be the same on your car, as I have the flush hubcaps and turbulators on the rear-view mirrors and A-pillar. Now, this is where the car starts to sweep up to the meet the narrower tail. Could dimples behind the rear door opening, at that level help? Or maybe a turbulator behind the rear door handle? Or possibly filling the door handle dimples with foam rubber? Again all hard to say. Is this air coming out from under the car? Could side damns get rid of it ? Could filling in the rear wheel openings get rid of it? Its too complicated for me!

11-08-2009, 02:09 PM	#73
a64pilot Senior Member Join Date: Aug 2008 Location: Albany Ga. Posts: 732 My Car: 2010 Prius Model: III Package: N/A Thanks: 19 Thanked 45 Times in 40 Posts Friends: 0	Re: Anyone have 800 Lbs of clay handy? New mythbusters episode If your serious, you don't need a wind tunnel, all you need is a ball of yarn and a roll of scotch tape. A video camera is helpful though. The illustrated guide to aerodynamics - Google Books Read the part on tufting. The easiest way to tuft is to pull a long piece of yarn the entire length, tape it every six inches or so and cut after taping. The yarn will show exactly where turbelent airflow begins Last edited by a64pilot; 11-08-2009 at 02:11 PM.

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