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Quote:
Originally Posted by RWebb View Post
you should talk to Dr. Ed E. Size about the degree of roundness that is aerodynamically allowable
Who?

This is what I mean about round rear corners that not do not allow for clean detachment of air.

Kármán vortex street
https://en.wikipedia.org/wiki/K%C3%A1rm%C3%A1n_vortex_street


Drag of a Sphere
https://www.grc.nasa.gov/www/k-12/airplane/dragsphere.html
Quote:
Case 3 shows the flow as velocity is increased. The downstream vortices become unstable, separate from the body and are alternately shed downstream. The wake is very wide and generates a large amount of drag. The alternate shedding is called the Karman vortex street. Here is a computer animation of the shedding, with the flow going from right to left.

This type of flow is periodic, it is unsteady but repeats itself at some time interval. The pressure variation associated with the velocity changes produces a sound called an aeolian tone. This is the sound you hear when the wind blows over high-power wires or past tree limbs in the fall or winter. It is a low frequency (low pitch), haunting tone.

The Audi White Noise Concept Is an Electric Vehicle With a Snarl
https://hypebeast.com/2016/4/audi-white-noise-concept



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Old 11-29-2019, 05:24 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #45425 (permalink)
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Old 11-29-2019, 09:20 PM
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Old 11-30-2019, 10:16 AM
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Old 11-30-2019, 11:32 AM
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kachi - Dr. Ed E. Size is a joke based on eddy size, the size of the parasitic eddies will (in large part) be determined by the radius of the rear - some sizes are imp. - others not
Old 11-30-2019, 01:19 PM
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Quote:
Originally Posted by RWebb View Post
kachi - Dr. Ed E. Size is a joke based on eddy size, the size of the parasitic eddies will (in large part) be determined by the radius of the rear - some sizes are imp. - others not
Got it, thanks.

Aerodynamicists: the engineers who want to tear your car apart
https://www.avoncityford.com/News/Details/46/aerodynamicists-the-engineers-who-want-to-tear-your-car-apart

Quote:
Modern cars are beautiful things, but there are people in this world who would like to tear them to pieces, people like Rob Carstairs, an aerodynamicist at Ford.

“The first thing I’d get rid of is the side mirrors. Off they go, that’d be great," said Carstairs. His reason for wanting your side mirrors gone is purely scientific: “They are useless for aerodynamics,” he said.

It isn’t just mirrors that are a thorn in the side for aerodynamicists. In his pursuit of aero perfection, Carstairs would scrap and change a lot of the things we take for granted on modern cars in order to create the most fuel efficient vehicle he possibly can by reducing drag.

The dream for an aerodynamicist is a vehicle that directs the flow of air smoothly all the way over the vehicle, without any disturbances.

That dream happens to look like a teardrop. A teardrop shape allows air to flow smoothly, while the long tail solves the problem of vacuums that are created as air leaves the roof and the trunk. A car this shape would easily be the most fuel efficient on the road.

But there are many reasons why these things aren’t solely left up to aerodynamicists, not least because most people don’t want to drive a car that looks like a giant teardrop.
I'd gladly drive a teardrop shaped car or truck.

Quote:
Many Ford vehicles now also have a slight flick in the tail lamps to stop the air flow from wrapping round the vehicle and causing added drag – an ingenious and mostly cost-free improvement in aerodynamics.’
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Last edited by kach22i; 11-30-2019 at 04:00 PM..
Old 11-30-2019, 03:57 PM
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Old 12-01-2019, 04:57 AM
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Old 12-01-2019, 07:25 AM
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Old 12-01-2019, 01:06 PM
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Originally Posted by Racerbvd View Post
Only cost him a Baker dozen

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Old 12-01-2019, 03:42 PM
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