View Single Post
Old 06-11-2018, 08:20 PM   #722 (permalink)
Master EcoModder
Join Date: Feb 2012
Location: Australia
Posts: 355

The Truck - '02 Nissan GU Patrol ST
Thanks: 5
Thanked 75 Times in 50 Posts
Originally Posted by aerohead View Post
In Hucho's book he shared a metric researched by Buchheim et al.,in which they reported that we could take the rear down-slope to a maximum 23-degrees without inviting flow separation.
Buchheim's lowest drag body was the VW 'Flow',at Cd o.14 as a long tail.
If you look at his graphic for this car,I came up with 22.5-degrees maximum angle by just laying a protractor to the drawing.
So then I assume if we design the curve to 23 degrees to depart the body at the 80% mark that would be within the parameters and this would also mean that the overall principle would likely be less than the std 1.78 tail ratio.
  Reply With Quote
The Following User Says Thank You to Tesla For This Useful Post:
aerohead (06-13-2018)