Accordion Kammback for big rigs ?

[Vekke]

Blue bombers idea is brilliant! roll curtains?

You should only choose a fabric which flex little so you wouldnt tear the curtain in pieces when you ride in rough terrain.

I have thougth of that thing and truck aeromodding for one month of time, because I have plans to start aeromodding firm for trucks here in finland. So all ideas are welcome to this post .

[botsapper]

Another answer to the same questions.
Applicable to answer (could be modified to solve, tractor/trailer gaps) trailer boattail aerodynamics, this relatively inexpensive & easily deploy-able idea may work for most aero-improvement situations. Could be retro fitted to many older model designs & actuated by operators' air systems.
FuelSaver by ATS™

Besides offering tractor boattail form when not pulling cargo, I could imagine the side bags at full pressure to seal tractor/trailer gap. There is corresponding electronic valving controls releasing pressure on the inside bag when taking tight turning maneuvers, re-inflating when in a straight line configuration.

[FastPlastic]

Looks like the type of thing that should be mounted a little lower. That way the car behind it just bounces off when it gets too close.

[botsapper]

Yeah, that would make a lot of fellow hyper-milers, here @ ecomodder.com for their best-ever mileage numbers. Drafting made a little safer...

[Vekke]

There are some information about truck fuel economy:

http://www.everytime.cummins.com/ass...Whitepaper.pdf

Enjoy