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Slide 54
    TEXT VERSION OF TITLE SLIDE:

    Title: Felling Hinge
    Type: Text and Image Slide
    Content:

    The hinge is the wood between the undercut (face cut/notch) and the back cut. The purpose of the hinge is to provide sufficient wood to hold the tree to the stump during the majority of the tree's fall, and to guide the tree's fall in the intended direction. The position of the hinge will affect the direction of fall. The size of the hinge is important to prevent splitting, fiber pull, barber chairs, and other undesirable and unsafe actions.

    The following describes a proper hinge:
     
    • The length of the hinge should be 80% of the diameter of the tree at breast height.
      Example: For a 12-inch diameter tree the hinge should be 9.6 inches long (12 inches x 0.8).

    • The width of the hinge should be 10% of the diameter of the tree at breast height.
      Example: For a 12-inch diameter tree the hinge should be 1.2 inches long (12 inches x 0.1).

    • The hinge on a tree with no side lean should be perpendicular to the intended direction of fall.

    [Image of Hinge Length marked with a double-headed arrow over the length of the circular tree trunk, and Hinge thickness marked with a double-headed arrow adjacent to the tree trunk and a diagonally marked area on the tree trunk]