Interesting but how does it relate to real world use?
There is noticeable strain in the switch sample before it comes apart.
Does permanent, non-elastic deformation (i.e.: kite will never return to original shape) happen at 80, 90, 100 kg?
By eyeball, the "standard" shows strain and separation at seam ends by 52kg, the switch version around 80-something.
My guess is 80+ load in one area could result in a kite that no longer flew straight, and delayed seam failure in time.
But perhaps this is not fair to say since the dogbone test depicted seems to be a harder test than anything that would really happen in use, with so little seam length to distribute loads. But I know so little of cloth engineering.
In any case I'm all for increased durability
Anyone with engineering/repair/design experience care to comment?