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OK, then back to smoke signals I guess ... :)

One solution that I have not seen anyone state (I am sure someone has as it is so obvious) is to fall back to text messaging. Energy requirements are at least a decade less.

Not having handled one are the original French ones well made?

But mass is not the only thing, linear momentum is mass*velocity and there are both practical and as a guess theoretical limits why they are not totally interchangeable. A sharp flint axe probably beats a round stone in felling a tree.

I have put in some thought. Not much but a bit. In a light mass (mass is constant but weight varies) splitting axe with equal head masses a Ti one might work better in cases. The reason being geometry, to be more exact, thickness. If side profiles and masses are equal then Ti one is thicker...

That Tilley looks like a good solution, apparently available here only by net. I have had a very wide brimmed Columbia floppy for 30 years, works except in wind. Seemed to be the source of lots of fun in Dubai.

The one edible oil that is least likely to go rancid is coconut oil, it is almost totally saturated so it oxidizes very slowly.

Well, the one apparent way is to practice in a sauna, in this case you might want an especially bad one as 35 C is not a real sauna temp. :D

I have friends that think the same though lately apparently there have been some voices that tell him that maybe something less Spetznaz might be in order, just that you would not get mixed with the "wrong" side. I do like my Haglöffs trousers but I think the main reason is that they fit me...

That can't be used in large part of the world where C temp scale is in use. ;)

As far as I understand about the same way as a somewhat soft steel. I remember sharpening ceramic knives with diamond wheels. That was a long time ago and I am not sure it works on all materials.

Is The Magician of Information in a fantasy novel once said: "huoh, it was bound to come up sooner or later, an answer without a question". Also: that it can be done does not necessarily mean it is a good idea. We could try the other extreme; make a hatchet out of Tungsten, at least it can...

Kinetic energy is probably less important than momentum if splitting is concerned, I am not at all certain how it goes with felling but very light weight felling axes seem far apart. A Ti hatchet or Tomahawk is definitely not useless and as a first guess it is better than Al one but I'll stick...

I think that had already been well established and as far as I know the linear momentum equation p=m*v which implies that mas and velocity (in vector formulation) can be exchanged as you said. (Newton's second is presently mostly stated in mass* velocity though Newton's original formulation was...

I see you got the power problem. :D

You are mixing mass, acceleration and speed in a very strange way.

Sharpness in an axe is not necessarily the same as in a knife. Especially in an axe that does not cut but split. True but not necessarily relevant. This relates to linear momentum, I guess, but not really to Newton's second. It is not quite clear if linear momentum acts like in an elastic...

It is not very clear cut that just leave off something: - season - weather - terrain - level of wanted comfort - some redundancy at least affect what one should, could and would carry.

Well, Ti starts to burn at around 800 C, long before it melts. I have also seen Ti tubing oxidize strongly at about 600 C, when it cooled down the scaling shot off in every direction almost dangerously, we all stepped back.

Yup fun stuff impact mechanics, it tends to run around linear or angular momentum, which is not energy. Linear momentum is quite simply the product of mass and velocity, m*v , which fairly fast shows that it is linear to both variables. That, I think is the important thing in this case.