Is Ti foil for a windscreen a good idea?
I don't really know. Here's what I'm thinking.
Generally, Ti alloys provide two important advantages over other metals: better fatigue characteristics, and better strength-to-weight ratio. Are either of these really important to a windscreen?
1) Ti foil should be more durable than Al foil. That is you can bend it more often (i.e. cycle it, or fold & unfold it) than Al foil before it fatigues and develops cracks. I don't like to fold flat Al foil over-and-over. I try to roll, in some fashion, my Al windscreen. I try to never make sharp folds/creases in Al (foil, or otherwise) if I want it to last a long time. Now..., I haven't actually done any controlled experiments. These comments are just based upon the inherent properties of these metals/alloys.
2) For a similar thickness (or less), it should be stronger than Al foil and shouldn't rip as easily.
1) Does one really need the extra strength & durability in a non-load bearing item?
2) While Ti is twice as strong as Al, it is also ~60% heavier. I may be able to get by with a lighter weight Al foil windscreen, i.e. lighter than what a stronger Ti windscreen might weigh. So, if a thin Al foil windscreen suffices, is Ti really necessary? Perhaps, for a lengthy Thru-Hike??? Couldn't an Al (foil, or slightly thicker) windscreen be "repaired" with some duct tape on the outside if it fails during a lengthy Thru-Hike?
What are we talking about here? Besides the durability issue for a lengthy Thru-Hike, are we talking about saving a fraction of an ounce? For example, windscreens, like those used in the two Mo-Go-Gear stoves sold by Gossamer Gear, weigh 16gm and 26gm. These are of much heavier construction than heavy duty kitchen foil.
Now I'm NOT the sharpest tool in the shed, so...what am I missing here?