. Skyline tension and deflection handbook. Log transportation Handbooks, manuals, etc; Logging, Skyline Handbooks, Manuals, etc. Figure span of a logging skyline. When the load is moving along a skyline, it is controlled by main and haulback lines or a snubbing line attached to the carriage. However, during log pickup, some carriages clamp to the skyline, whereas others are snubbed by a control line. The upper-end tension occurring when the load is clamped to the skyline is greater than that produced when the load is snubbed by a line, because the snubbing line supports the tangenti
. Skyline tension and deflection handbook. Log transportation Handbooks, manuals, etc; Logging, Skyline Handbooks, Manuals, etc. Figure span of a logging skyline. When the load is moving along a skyline, it is controlled by main and haulback lines or a snubbing line attached to the carriage. However, during log pickup, some carriages clamp to the skyline, whereas others are snubbed by a control line. The upper-end tension occurring when the load is clamped to the skyline is greater than that produced when the load is snubbed by a line, because the snubbing line supports the tangential component of the load. Pro- cedures are given for obtaining tension due to the load when either a snubbing line or a carriage which clamps to the skyline is used. For the case of a clamping carriage, the analysis was performed with the assumption of a slack snubbing line. Skyline tension with a tight snubbing line cannot be presented in a general manner and is, therefore, not included. The results contained in this report were determined by analyzing the mechanics of a skyline as a problem in statics, with no consideration given to the effect of load accelerations or impacts due to hangups. A minimum safety factor of 3 is recommended for skyline designs to account for these effects. The elastic limit of wire rope is approximately one-half of the breaking strength, which means that, if the rope is worked at a safety factor of approximately 2 or less, destructive stretch will occur. 3. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lysons, Hilton H. cn; Mann, Charles N. [Portland, Or. ] : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture, Forest Service
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