That is weird; I have found that folded bands, even though they are more work last longer for me. Folded bands have always torn at the kink where they were tied (either at the fork or pouch). I am shooting a two strip Saunders band set (actually one strip doubled with no tie at the pouch) right now with well over 1000 shots on them and still no tear has started. My own sets don't last that long because even though I use 2 strips there is still a kink at the pouch tie. Tex
My bands always tear at the pouch, never at the fork. But it is strange, they do not break IN the kink, but about 3-5 mm before the kink position, in relaxed condition. At full draw, this means that the tear occurs about 15 - 25 mm before the pouch! I do not know why that is, but I have seen others reporting the same thing.
It may be the case that the tearing happens when the bands hit the fork. The pouch side will have the highest speed and momentum. But that is just a theory.
I did notice another effect: Heat. You can do a little test yourself. Just put a weak band with thin flat rubber (Thera Band of any type, just not much of it) on any kind of slingshot you own. In example, for Thera Band Gold, use a single strip of 1,5 cm x 1 cm. Then draw it out in full, with no ball in the pouch. Now put your upper lip (very temperature sensitive body part) against the drawn out rubber. You will notice that the rubber just before the pouch is very warm, but the rubber near the fork is much cooler.
"1.5 cm x 1 cm" - that's tapered, right? If so, the narrower end will be working harder so will heat up more. The only time I've had a band break rather than tear a bit or get a hole was with three strips of untapered TB-gold per side. As with the other damaged bands, this happened at the pouch end, a few mm in front of the binding, as per your finding, Joerg.
If using a long strip doubled over and any tear happens at the tied end, it would be safer to tie at the pouch, wouldn't it? Unless one uses double taper bands tied on at the fork.
On the subject of heat and hence internal friction, I notice from one of your videos, Joerg, that you rated the TB-black band over the gold and were thinking about the thinnest available - any conclusions yet? And have you found the extra width to be a problem?
And on taper, has anyone found an optimum ratio of forkouch
width? Oh, it's all a bit technical...