Huzefa has got it right - I used the Ti Goat 0.005" titanium. If you handle the Ti sheet on it's own, it will feel very flimsy, but once it has the bends added, and bonded with the other parts, it creates an extremely rigid structure. It does not flex at all when loaded with a pot of water. In fact, I won't have any strength issues with this.
5 minutes passes...
I just did a crush test using my hands..I would say that you would need a good 10 lbs or so before anything went wrong. Like I said before, it's the structure that creates it's strength. Of course, that is with the body alone, the pot stand, made of the Ti wire, is very flimsy. I only used that because I wanted to test the body of the structure and didn't have any plans for a pot stand. I wasn't sure it was going to create the flame pattern seen on the bushbuddy - and it does. I plan on making a proper pot stand/wind shield on my next version.
Good point about the Ti becoming brittle. I have boiled a few liters in it and haven't had any issues, however, it hasn't seen anyhthing near severe use so we will have to wait and see. Is a standard wood flame hot enough to chaneg the properties? I'm not sure. What temperature can it handle?
I actaully want to press the bottom and top plates into the shape instead of using the orgami technique in the current design. This will allow the walls to be truly round instead of the octoganal (what the shape of 12 sides?) shape it is now. I just need to finish up a few projects before I get that deep into this one.
At 37 grams, I would be willing to give up a little strength and longevity. My only complaint with the BB is that you can bring esbit tabs for a few days and come out lighter...the Ti version fixes that.
Oh yeah, I'm not sure what grade it is. The thinnest Ti 6AL-4V I have seen is 0.016" thck, and if I used that the weight would be too large and I'm not sure how easy it would be to bend/form.
I do have some 0.016" on order, but those are for my Ti Crampons...coming soon...:)