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So Gerr, what is your theory on this?

As far as throwing a loose chain, I would say it is because with backchaining, the sprocket is pushing the chain which causes a "bunching" force on the chain links, which would be particularly pronounced with a loose chain cuz there's no chain tension to prevent bunching, so any momentary...

Could be, but back chaining seems better even when finishing cuts when you start in the kerf underneath the uncut wood and have to pull up on the saw

I am seriously curious about this question lol. Maybe it is a combination of reasons - Some of it could be the(1) ergonomics of back chaining, with the saw supporting a lot of its own weight. And then(2) the sprocket helps you in the kerf, as Grendel says above. And how bout the reason that...

I've never done the commercial tree thinning. I wonder if the back barring works better there because it is more ergonomic instead of because the top of bar cuts faster? When back barring at that angle you are letting the saw support most of its own weight vs when cutting with a pulling chain...

But would you agree that back chaining to finish a cut, as presented in the original post, is easier/better than with a pulling chain cuz the saw is naturally sucked into the cut?

Well I will ask this: do you know the answer? Is it in FGTW? What page:)?

Agreed, but why is this? Is it because of what I described above or is it something else. You can clearly feel it happening, I'm just wondering why it happens. Gerry B, you are a cutting guru, do you have an opinion here??

I think I figured it out: whenever the chain is spinning in a kerf there is some degree of contact between it and the sides of the kerf. This contact tends to drive the tip, and so the top of the bar, upward. The tip is acting like a wheel or a gear and causing the bar to walk upward to some...

I dunno, if the bar is in the same depth for pulling or pushing, same amount of wood should be being cut, no? It definetly feels easier, may be faster, maybe not. It feels like the saw is being sucked into a sweet spot in the cut.

A small, simple question, one I feel like I should know the answer to, but I really don't: you are bucking a log (into firewood or long lengths, doesn't matter), you cut say 3/4 or 4/5 of the way thru and then roll the log to finish the cut. When you stick the bar into the kerf to finish the...