I have been doing a lot of shooting these last few days, as I don't have to go to work anymore (hopefully for EVER!). I love YouTube!
Anyway. So far, I pretty much thought that tapering and band stretch are the only factors that have an impact on the band lifetime. No tapering, low stretch = many many shots, extreme tapering and stretch = very very few shots.
However that isn't the entire story.
My new through-the-insides shooter easily doubles the lifetime of a band vs. OTT frames. That's right. I got more than 150 shots from a 3:2 tapered band that I stretched to factor 6 (= as far as possible). That band would have lasted maybe 50 shots, 70 shots tops, on an OTT frame.
Then I cut a totally untapered bandset for an OTT shooter, same stretch. It broke after about 80 shots. However the important part is: It breaks at the pouch, just like the tapered bands do.
I now believe that one of the main reasons for the bands breaking at the pouch isn't the higher stretch. Maybe it is the impact of the bands when they snap back. The ITTF slingshot leads to way less violent hits because the don't have that hurling effect, but go straight back through the fork.
In other words: The OTT method leads to hits of the bands to the hard parts of the frame.
I now cut a loong bandset (40 cm active length), entirely untapered, 3cmx3cm, 2 bands per side. I attached it to the hand braced slingshot I made some time ago, but I "upholstered" the front with some thick leather.
That's just brilliant Jorge but what about factors such as storage,age,humidity,temperature,and exposure to sun light. Do you have advice regarding those things? If you solve those problems you might be able to give up your youtube job lol!
Out of interest I wonder what the bandlife is like in Tobias' cow hide covered slingshot?
Off the top of my head perhaps it isn't just the impact of the bands and pouch on the wooden frame but also the friction? A wad of padding covered in teflon cloth would absorb the impact but "teflon cloth" PTFE
I don´t get it..
Are you refering to that "TTF Rambone experiment" or to the Slingshot shown in this thread?
If you refer to the "TTF Rambone experiment", then I get your point.
There is that simple archaic principle of a fork, rubber and a pouch..
And as always perfection means to master the joints, the attachments.
Yet I think that there is some more efficient "truth" to be found thinking
about the pouch (mainly about weight, softness and the vectors of inner forces)...