Late to the party but this subject is one I've spent a bit of time thinking about...
The beauty of a straight handled California rip claw hammer is that the head alignment is the same no matter where on the handle you hold it or which side of the hammer you are using.
I doubt many current day framers ever use the side of the hammer at all.
Is that because the haft is straight or is it because its a maul and it doesn't stick easily so I am not changing my foot placement to retrieve the bit from the round?
Replication of a repeated motion with subtle, controlled variations leads to consistent accuracy. Like shooting hoops from the top of the key.
Could it be that special ergonomically formed single bit axe handles came into complete dominance in response to a need for more controlled and comfortable chopping from atop the fallen log? It seems to me a bit of a twisted, backward working rationale, if I am understanding what G-pig is trying to explain about where and when a curved handle makes sense. When I chop from up there, and that only occurs in the notching stage of the hewing process for me since I would never buck with an axe anyway, I don't even want the whole cutting edge to engage on the lower/under side because I want the bottom of the notch horizontal, all the more reason for a straight handle. Cuts with the toe predominate down there.
I think it's called "joggling" or "juggling". Maybe that would help the discussion?
I have never (yet) had any reason to notch a log in preparation for hewing but when bucking into manageable sections I greatly prefer a curved haft and one that's as long as possible though my experience is not extensive. Even with an arm span greater than my height I find bucking with a short haft (under 32") simply miserable. Not only do I have have to generate much more arm speed with the shorter stick but I also have to bend much more dramatically at the waist thus calling the Psoas muscle into action - a sure fire back ache in the making. I certainly tire more easily with a short haft. A wider stance helps some but then I have to almost whack myself in the jewels once I'm into the log a bit to save my wrists and then I'm starting to sink the heel of the bit in rather than the width of the blade and this demands extra swings. I have not tried a "closed" hang but I don't want to use the shorter length handle that it demands with my, shall we say, physique.
Im not particularly clear on what your beef is with the concept of a closed hang being part of an alternate set of differences to accommodate comfortable wrists and hands on the top of a log.
Not directed at me but I wanted to chime in - For me it's the shorter handle that is then required. I was looking at a downed 20+" log that blocked our path a few weeks back. As all I had was a 28" axe I didn't relish the idea of squatting like a bear in the woods to reach down to the lower portions. We decided to turn around and go the other way. It might have been a different story if I had a full sized SB with a curved handle - "might have" being the operative words.
The where and when questions making reference to specific instances, where; a top the log, and when; cutting down low, and not general questions of space and time, being historical questions more interesting to some than others. But we are in agreement that the closed head and the bent handle probably would have nearly similar effects relating our wrists.
Again, I disagree with respect to the ability to use a longer haft when the handle is curved vs. the length limitation of a straight haft ESPECIALLY with a closed hang.
That S shape gives more head speed to the axe at the end of the swing. It does so by the off hand sliding down the haft, the right hand for a right handed person.
I'm not sure there is much to this as the most "curves" used in athletic activities to generate an increase in speed are of the decreasing radius type (there may be a specific technical term for this action/effect) wherein the shortening arc of the motion generates additional speed of rotation. Examples are a gymnasts back flip (most obvious on doubles or triples) a skater's scratch spin, or a boxer's hook. Besides, my hand slide on a straight or curved handle.
I just bought a Council 3.5 # Jersey Pattern w/ straight handle. It will be my only straight handle single bit. It will be interesting to compare it to my KP Jersey pattern w/curved handle. It won't be an entirely fair comparison. The Council comes with a 36" haft. The KP has a 32".
I bought on as well but the blade was so tilted to the length of the handle that I sent it back. I'll buy another when I locate a retailer that stocks this model. I do prefer straight handles for splitting and am currently using an old Jersey beater on a curved handle. It does make it tougher to predict the bit placement when I use the Tom Clark twist.
There aren't even mills today that could handle such a monster log. We have one local mill that still cuts logs over 36". Many of the log trucks I see in N. Idaho are carrying over 100 pieces.
I saw one truck within the last year that had a single huge log on it. I'd guesstimate between five and six feet at the but end. The truck following it had only three logs of varying widths. There's a little bit of old growth still left in private hands around here. Someone told me there was still a local mill that could handle big stuff.