MyTreeLessons.Com
Friction Hitches

 

 

Trees provide fantastic support for themselves, superior to any other life in Nature.  That is why they are the tallest.  The amount of leveraged forces are immense.  Compounding/multiplying the fantastic height of the tree X it's fantastic weight; giving the potential leverage.  The angle of the lean, giving the amount of that potential leverage achieved.  It is easier for you to hold 30# straight up, or even tilted a bit, than it is to hold the same weight out horizontally from yourself.  This user operated calculator, gives the leverage at any given angle (angles are actually alterable too).

A hinge will be have a maximum strength approximately matching the calculated leverage on the angle it first flexes forward.  In felling especially, that leveraged load increases as the tree tilts forward; as the calculator shows.  So in shallower leans it is more important to force a stronger hinge with line pull or wedge push, for the increased loading is more intense + farther to be traveled on the hinge.  So, the extra force (rope and wedge) would prepare a hinge better for such work, by forcing the hinge stronger, for the more intense loading and longer travel/speed build up forces.

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