View Single Post
Old 07-23-2013, 02:19 PM   #37 (permalink)
Master EcoModder
kach22i's Avatar
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 4,007
Thanks: 78
Thanked 2,684 Times in 1,881 Posts
UPDATE: 07/23/13

GMC Pickups 101: Busting Myths of Truck Aerodynamics
2014 Sierra gains fuel economy, quietness from time in wind tunnel
GMC Pickups 101: Busting Myths of Truck Aerodynamics
So what accessories can truck owners add to help aerodynamics? Tonneau covers for the bed help smooth airflow over the truck, and Bloch says soft covers are more beneficial than hard covers because they form to how the air wants to flow. Running boards can also help air flow smoothly down the truck’s sides.
I say that there are support ribs which disrupt this flow and theory, plus the flutter of the fabric adds air flow distortion. However, I'm not an aerodynamics, so what do I know? I only know what I have seen on my own truck covers.

Some tailgate up verse down discussion the article too.

Even the top of the Sierra’s tailgate and the center high-mounted stop light are optimized to guide air cleanly around the truck. And because Bloch’s team detected unwanted airflow between the cab and bed, new sealing has been added.
Mind the gap.
Architect, Artist and Designer of Objects

1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft

Chin Spoiler:

Rear Spoiler Pick Up Truck

Roof Wing
  Reply With Quote
The Following User Says Thank You to kach22i For This Useful Post:
aerohead (07-24-2013)