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-   -   Guess the drag coefficient? (https://ecomodder.com/forum/showthread.php/guess-drag-coefficient-734.html)

Daox 01-21-2008 02:35 PM

Guess the drag coefficient?
 
So, I'm reading through my new handy book on aerodynamics, and come across this car from 1924. Anyone care to guess the coefficient of drag?

http://farm2.static.flickr.com/1271/...0893a09175.jpg

Stan 01-21-2008 03:15 PM

That looks like Rumpler's Tropfenwagen, which in a 1979 wind tunnel test recorded a Cd of 0.28.

Daox 01-21-2008 03:26 PM

Quite right! Maybe its just me, but I find it amazing that we could develop a car that slippery 84 years ago. None of my cars I have now are more aerodynamic than this 84 year old car. Kinda makes you think.

Stan 01-21-2008 04:28 PM

Oh, I am not so surprised. Edmund Rumpler had a Ph.D. in aeronautical engineering and clearly thought a great deal about drag reduction. He was also a prolific designer, whose most famous product was the Taube of WW1 fame.

http://wrcs.org.au/news/2005/pics/051219.jpg

And this was his 1926 design submission for a transatlantic passenger plane.

http://www.century-of-flight.net/Avi.../images2/8.jpg

Low-drag designing certainly did not end with him, though. In 1980 the Volkswagen ARVW registered a 0.15 Cd and went on to set numerous world speed records for diesels, ultimately setting the still-existing closed course diesel record of 362 kph (225 mph). It also got 39 mpg at 250 kph (155 mph) and 18 mpg at top speed!

http://upload.wikimedia.org/wikipedi...723px-ARVW.jpg

basjoos 01-21-2008 04:49 PM

Here's an even earlier low Cd car, the 30 horsepower 1906 Stanley Steamer Rocket. Its body was made from an upside down wooden canoe and set a speed record of 127mph in 1906. The next year it got up to 150mph before it hit a bump in the beach sand that sent it into the air and wrecked it.

http://img.photobucket.com/albums/v4...ey_steamer.jpg


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