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Interesting, Fi. I hadn't heard of the Dog's Tooth Cut!

Bronc, Daniel is right on both counts. The formula is that face cut width (or hinge) = 80% of the tree's diameter. The easiest way I think of it is that 10% of the diameter should be visible on each side of the face cut. Jepson argues that the 80% rule takes oval/oblong trunk shape into...

Excellent points, Marc-Antoine. Jepson maintains that the 80% approach works for MORE trees than the 1/3, but completely concedes that nothing works all the time. He uses some of the same examples you do as evidence.

While I'm thinking about it, Bronc, another really valuable web resource is the series of BC Faller Training Standard videos (17 total) on YouTube Start with "Introduction" here and watch them in order: https://www.youtube.com/user/WorkSafeBC/search?query=bc+fallers WorkSafe BC (sort of like...

As far as I'm concerned, this is the bible on the subject: https://www.treestuff.com/store/catalog.asp?item=1260 Starting on page 59, Jepson talks about how using an "80% of diameter" rule has advantages over the traditional 1/3 rule on certain trees. If you've got access to professional...