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-   -   eco runner team delft (Cd 0.0512 BEST) Create Car With Lowest Ever Drag Coefficient (https://ecomodder.com/forum/showthread.php/eco-runner-team-delft-cd-0-0512-best-31770.html)

slipknotsv 04-19-2015 03:37 AM

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 :thumbup:

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

1
http://i58.tinypic.com/34imkc6.jpg

2
http://i59.tinypic.com/sermnp.jpg

Cd 04-19-2015 07:49 AM

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 ?

NeilBlanchard 04-19-2015 08:52 AM

Scale does not affect the Cd, and neither does speed - up to ~250MPH.

Vekke 04-20-2015 11:20 AM

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?

Hersbird 04-20-2015 01:49 PM

Do the tires have to be wider? Dragsters go over 300 mph on what look like 70's Honda motorcycle tires.

gil 04-20-2015 02:44 PM

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

Gil

aerohead 04-20-2015 06:50 PM

tires
 
Quote:

Originally Posted by Vekke (Post 476176)
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.
http://i1271.photobucket.com/albums/...itled2-1-1.jpg
You can see what happens to the VW flow body when wheels are added.Although fairings would bring that Cd 0.14 down.
http://i1271.photobucket.com/albums/...ntitled6_6.jpg


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