•The skyline length is fixed, that is the line is neither lifted nor lowered during extraction. The length of the line is based on the longest length that will just provide the minimum desired clearance (full or partial suspension) across the full yarding span
•Maximum allowable tensions in the skyline are used first in the calculations. Tensions in the mainline and haulback line (if any) are then checked to see if maximum allowable tensions required in these lines to achieve static equilibrium are exceeded. If mainline (or haulback) tensions are exceeded skyline tensions are reduced until all line tensions are within maximum allowable tensions.
•A haulback line is required if the chord slope is less than 20%.
•A clamping carriage analysis can be selected for standing skyline systems without a haulback line. If a haulback line is present it is assumed that a clamping carriage is not required to hold the carriage stationary.
Topic Last Updated: Tuesday, 13 September 2016