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pg 67: Generate lift, reduce trailer weight 15% = more efficiency? Uh-Oh. How much more of this article is suspicious or worse yet, garbage?
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That's Englar. Active aerodyamics via pumped air. He found he could effect plus/minus drag and lift by valving the slots on the four rear sides; All on to go, sides off to stop, top off (I think) for lift and bottom off for downforce (or vice versa).
The fuel savings comes from reduced tire sidewall flex, while retaining the ability to quickly drop the load for better braking.
Appendix B is more than I wanted to know about reducing shrinkage on the way to the slaughterhouse.