View Single Post
Old 11-24-2020, 09:36 AM   #15 (permalink)
Vman455
Moderator
 
Vman455's Avatar
 
Join Date: Feb 2012
Location: Urbana, IL
Posts: 1,939

Pope Pious the Prius - '13 Toyota Prius Two
Team Toyota
SUV
90 day: 51.62 mpg (US)

Tycho the Truck - '91 Toyota Pickup DLX 4WD
90 day: 22.22 mpg (US)
Thanks: 199
Thanked 1,804 Times in 941 Posts
Quote:
Originally Posted by IRONICK View Post
The degree of the diffuser also depends on the angle of the car's roof when combining flows.
Yes, you're exactly right--the optimum diffuser angle will depend on the shape of the particular car in question, which is why you should test it. The "2 degree diffuser angle is always best" rule has been bandied about here for a long time, but that clearly isn't the case given that low-drag production cars sometimes use much steeper angles!


Quote:
Originally Posted by IRONICK View Post
But obviously it has to be like you in the book.
And now you've devolved into (unfounded) personal jabs.
__________________
UIUC Aerospace Engineering
www.amateuraerodynamics.com
  Reply With Quote