The cables can be rigged in several configurations.
There are two classes.
Into this there are varieties of loading systems.
While skyline logging requires additional setup time, the vertical lift of the skyline allows faster yarding, which can outweigh the additional labor costs, especially on larger harvest units.
Since the 1980's Grapple Yarders have become popular.
Skyline and grapple yarding, however, require more complex and expensive equipment. A traditional highlead or gravity system will function with just two cables, a skidding line and a haulback line. As the names imply the skidding line is used to drag the logs in, and the haulback line is used to drag the skidding line back out for the next turn (or group of logs).
A skyline system will add a third line---the skyline whose function is to hold the skidding line and the haulback line off the ground or 'in the sky'.
The yarder itself is located on a landing, a flat area on top of the ridge that is being logged. After the trees are retrieved by the yarder, the limbs are bucked (removed) and the logs are then placed in piles awaiting transport.
Things looking up for Corner Brook: western Newfoundland contractor Willy Anderson has added a cable logging system to his operations to extract some extra volume for Corner Brook Pulp & Paper
Jun 01, 1999; While the volumes are not big, the wood being brought in by Willy Anderson's TLD Gauthier cable logging system is nonetheless...
Golden's towers of strength: Whiskey Jack logging has endured some bad times, but with two-cable logging towers among its assets, it's managing to keep its main customer, and employees, happy
Aug 01, 2004; Employes of Golden, BC-based Whiskey Jack Logging Ltd. have seen their share of adversity in the 30 plus years the company has...