View Single Post
Old 01-02-2012, 12:46 PM   #13 (permalink)
COcyclist
Aero Wannabe
 
COcyclist's Avatar
 
Join Date: Dec 2007
Location: NW Colo
Posts: 738

TDi - '04 VW Golf
TEAM VW AUDI Group
90 day: 52.55 mpg (US)
Thanks: 705
Thanked 219 Times in 170 Posts
Quote:
Originally Posted by aerohead View Post
The thing about boat-tailing as Hucho tells us:
*The front of your car is already okay as far as attached flow and any additional streamlining will pay diminishing returns.
In other words, there are returns to be had but they will be minimal (as in, hard to see at the pump) on most modern passenger cars?

Quote:
Originally Posted by aerohead View Post
-------------------------------------------------------------------------
When Chevy boat-tails the Malibu they get Cd 0.12. When they fair in all the tires and wheels the Cd goes below 0.10.
-------------------------------------------------------------------------
Just for clarification, the Cd 0.12 is hypothetical?, based on the research if Chevy had boattailed the 2013 Malibu Eco or did they test a boattail on that car?

So the Malibu would go from Cd 0.29 to Cd 0.12 if they only added a full boattail that follows the template??? That means overall drag would be roughly 1/3 of what the production rear end allows. If this is the case, I can see why it is worthwhile to pursue drag reduction at the back of the vehicle.
__________________
60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun
https://ecomodder.com/forum/showthre...tml#post621801


Quote:
Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.

Last edited by COcyclist; 01-06-2012 at 12:40 PM..
  Reply With Quote