On Monday, June 12, 2017 at 11:51:11 AM UTC-6, wrote:
The air flow escaping through this area might induce flutter (which in turn will induce a loss of performance of 100%).

Bert "TW"

Are you talking about the exterior mylar seals or the fabric "S" seals in the joint? Once the fabric seals are in place I don't think air escaping is the real issue, more of turbulence due to the dip in the sahpe, but I suppose that could aid flutter.

I see now that some gliders don't have seals internal to the joint, and depend only on these exterior seals, so you're right about the flutter problem.