What is the proper angle for an Open Face notch?

The proper angle for an Open Face notch ranges from 70° to 90°. This angle is crucial for making an effective cut when felling a tree, as it helps to control the direction in which the tree will fall. The Open Face notch is designed to ensure that the tree falls in a predictable manner, thus enhancing both safety and efficiency during the felling process.

When the notch is cut at this angle, it creates a wedge that allows for sufficient hinge wood on the opposite side, which further aids in directing the fall. The notch shape also promotes a gradual release of tension in the tree, minimizing the risk of kickback or other unexpected movements. This contrasts with angles that are too steep or too shallow, which may compromise control over the tree's direction when it starts to fall. Therefore, the 70° to 90° angle is essential for optimal performance and safety in tree trimming and felling operations.