View Single Post
Old 09-22-2018, 04:34 PM   #10 (permalink)
aerohead
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 13,046
Thanks: 20,921
Thanked 6,378 Times in 3,961 Posts
50%

Quote:
Originally Posted by hat_man View Post
Thanks Aerohead. I get it now. Low pressure under the tonneau and higher behind tailgate. I'm assuming that the cab end of the half tonneau needs to be open to the bed to work correctly. It's kind of a shame if that's true. It defeats the practical purpose of the cover keeping the elements out. Full aero cap becomes the better drag reduction/practical option, but also the most labor intensive.

Is half tonneau a figure of speech, or is it covering 50% of the length of the bed? My mind is trying to configure something that is open to the bed and can still keep out most of the weather.
GM,who patented the half-tonneau, illustrated their drag curve as a function of cover length,and you can see that the drag minimum occurs when the length is 50%.So yes,it really is a 'half' tonneau.
And it is the forward portion that's open to the atmosphere.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
The Following User Says Thank You to aerohead For This Useful Post:
hat_man (09-23-2018)