Hi, all! First off, I'm asking this because I'm not a professional logger, nor at all familiar with forestry operations. But I am trying to build a model of a Madill 071 Tower Yarder, and I am trying to understand the functions of it's winches to better understand how to approach replicating the machine. It has five operations winches, according to the brochure: Skyline, Main, Haulback, Straw, and Tag. The Skyline seems obvious; it runs over the top of the spar and is secured downrange. The carriage with chokers hangs from this. The Main and Haulback lines are attached to the carriage, and move it back and forth on the Skyline. Correct?
But what do the Straw and Tag lines do? And how should they be routed and stowed when the spar is down for transport?
Likewise, the three guyline winches obviously handle lines that are used to provide stability to the spar when in operation. Do they attach to the structure of the yarder after routing through the sheaves atop the spar, or are they routed away to some other location? And where would they be stowed?
Any insight into how the rig works would be immensely helpful to me in planning and executing the project. Thanks!
But what do the Straw and Tag lines do? And how should they be routed and stowed when the spar is down for transport?
Likewise, the three guyline winches obviously handle lines that are used to provide stability to the spar when in operation. Do they attach to the structure of the yarder after routing through the sheaves atop the spar, or are they routed away to some other location? And where would they be stowed?
Any insight into how the rig works would be immensely helpful to me in planning and executing the project. Thanks!