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1952 Porsche 550 Prototype
https://angelo911porsche.jimdofree.com/porsche-550/
http://forums.pelicanparts.com/uploa...1575072053.jpg

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This was the first race of the prototypes built by Porsche which usually attribute their success in sports car market. This example is the first of two prototypes built 550 and ran (and apparently the only one to survive) - After a year of development starting in 1952, and winning its initial release in 1953 (this car is actually a removable hardtop - running with or without).

In 1953 the two Porsche 550 Prototypes 550-01 and 550-02 ran the 24 hours of Le Mans exchange intervals but for the rest running almost side-by-side, crossing the line in basically the same interval from which they started the race . The victory was awarded to Le Mans scoring officials 550-02. The end of the season brought the cars to Mexico where he raced in 1954 La Carrera Panamericana

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Originally Posted by kach22i (Post 10673640)

I was driving behind one of these today, looks fairly aerodynamic except for the rounded rear corners.

Range Rover - Velar
https://www.landroverusa.com/vehicles/range-rover-velar/index.html
http://forums.pelicanparts.com/uploa...1575070554.jpg

you should talk to Dr. Ed E. Size about the degree of roundness that is aerodynamically allowable

A Colorful History of Racing Hues: Deutsche Weiss und Silber (3 of 4)
https://petrolicious.com/articles/a-colorful-history-of-national-racing-hues-german-white-and-silver-3-of-4
http://forums.pelicanparts.com/uploa...1575075905.jpg

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The vagaries of time have swallowed up many stories from our collective pasts and the meandering tale of Germany’s racing color is just such a lost legend. Completely unique amongst the ranks of nations, Germany is the only country to have two international racing colors it’s racers can choose from. It is the story to which we now turn in our exploration of national racing colors.

When the racing colors for the every country were first decided with the advent of the Gordon Bennett Cup, Germany was among the first four to be assigned. White was their chosen hue and so it remained for 32 years of racing and victories. Then something happened that is disputed and today verges on legend.

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Originally Posted by RWebb (Post 10673692)

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
https://upload.wikimedia.org/wikiped...-animation.gif

Drag of a Sphere
https://www.grc.nasa.gov/www/k-12/airplane/dragsphere.html

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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
https://image-cdn.hypb.st/https%3A%2...&cbr=1&fit=max
https://image-cdn.hypb.st/https%3A%2...&cbr=1&fit=max

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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

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Originally Posted by RWebb (Post 10674264)

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
http://forums.pelicanparts.com/uploa...1575158163.jpg

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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. :cool:

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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.’

The uber rare Martini Edition Leaf.

http://forums.pelicanparts.com/uploa...1575205025.jpg