Thread: CdA list
View Single Post
Old 08-07-2020, 01:17 PM   #168 (permalink)
Master EcoModder
aerohead's Avatar
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 12,963
Thanks: 20,775
Thanked 6,342 Times in 3,938 Posts
R.G.S. White

Originally Posted by freebeard View Post
Pix or it didn't happen.

I found a unicorn! A thread where aerohead and Julian Edgar were getting along. Or at least trying to. It didn't go anywhere.

The paper sounds interesting, but I can't say if it's related, it's being paywalled.
My late-1970s copy of the CRC Press, HANDBOOK of CHEMISTRY and PHYSICS contained White's recipe, derived from a SAE Paper on 'Estimation of Automobile Drag Coefficients', published in 1969.
Hucho covers this work, and lists the source in his reference section.
White breaks a cars architecture down, numerically, into around 13-categories, showing the worst-to-best forms for each category.
A formula is presented, using a summation of the total, added from the 13-categories. If the 'best' of each category is used to create the composite vehicle, you arrive at Cd 0.245.
Hucho will argue the point, but it turns out that many contemporary, low-drag cars embody all the low-drag features of the thirteen categories of the 'recipe.' And one will recognize White's work when you follow Hucho et als' 'drag optimization' techniques of 1976. It's very intuitive.
Photobucket album:
  Reply With Quote