I GOOGLED Scott Funderburk Masters Thesis Texas Tech University
It's online as a PDF file.
I printed a copy (128-pages)
He and Professor Carver used edge radii for their patented boat tail design.
On the 1/12th-scale 18-wheeler model :
*simulated 5-foot = 6.7% drag reduction
*simulated 8-foot = 17.4 % drag reduction
If the trailer had been skirted and the tail was lower to the ground they would have registered better numbers.
For RV travel trailers,there's no reason why we can't do better than the big-rigs,as we aren't held to the same regulations.
But it looks like 3' may have only a limited impact.We'll have to wait 'n see.
