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Old 04-19-2015, 04:37 AM   #1 (permalink)
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Thumbs up eco runner team delft (Cd 0.0512 BEST) Create Car With Lowest Ever Drag Coefficient

eco runner team delft (Cd 0.0512 BEST) Create Car With Lowest Ever Drag Coefficient

INFO Chief aerodynamics engineer Joost Dorscheidt tests the Ecorunner V... News Photo | Getty Images

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Old 04-19-2015, 08:49 AM   #2 (permalink)
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So if this little cigar was scaled up to the size of a traditional car ( with a height of 50" to the roof ) how much would the Cd increase ?
Obviously ( duh ! ) the CdXA would increase, but what about just the Cd.

Also, if i remember correctly, the top speed of the car is something like 15 mph.
How would the drag change if driven at traditional speeds ( both at this scale, and when brought up to traditional size )

Aerohead, you got yer ears on there good buddy ?
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Old 04-19-2015, 09:52 AM   #3 (permalink)
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Scale does not affect the Cd, and neither does speed - up to ~250MPH.
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Old 04-20-2015, 12:20 PM   #4 (permalink)
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When you scale that up what about tires that need to be wider which is the biggest source of drag in that kind of slipstreamed vehicles?
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Old 04-20-2015, 02:49 PM   #5 (permalink)
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Do the tires have to be wider? Dragsters go over 300 mph on what look like 70's Honda motorcycle tires.
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Old 04-20-2015, 03:44 PM   #6 (permalink)
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The BMW i3 has tall narrow tires. Since its a light car a narrow tire suits its traction needs, and it doesn't sacrifice on style .

Bridgestone Releases Details on the BMW i3 Tires | Inside EVs

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Old 04-20-2015, 07:50 PM   #7 (permalink)
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tires

Quote:
Originally Posted by Vekke View Post
When you scale that up what about tires that need to be wider which is the biggest source of drag in that kind of slipstreamed vehicles?
This would an area of weakest available data.And I wish these teams would test for 'real' cars and publish the data.
The 1957 MG EX 181 is of the few cars with 'real' cars measured.With it's limited wheel fairings it was reported at Cd 0.12.

You can see what happens to the VW flow body when wheels are added.Although fairings would bring that Cd 0.14 down.

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