dren wrote: I don't think the tube is feeding the DD. I think it is blowing the beam or rear wing somehow. Perhaps from the end plates instead of the actual wing. The DD looks to increase the diffuser exit volume by connection through the starter hole.
The beam wing looks like it already has a slotted gurney.
Exactly my assessment. They are simply taking advantage of the CFM yielded from the starter hole positioned in a certain way in the diffuser. The actual volume of the diffuser increases, but I suspect they are saying it's part of the crash structure? That's they only way I fan figure they are getting away with it as they are gaining approx 80-100sq cm diffuser volume with such an expansion which is probably worth a couple tenths.