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-   -   Guess the drag coefficient? (

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?

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.

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

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!

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.

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