. Economics and design of a radio-controlled skyline yarding system. Logging, Skyline. Fan-Shaped Unit A fan-shaped unit is generally used when a cutting unit is laid out in a drainage head (fig. 7). A single spar is used at the landing and the skyline roads radiate to tail spars spaced along the outer edge of the unit. Note that each skyline is not in the center of the road or area to be logged, because the weight of the butt- hook and chokers cannot be pulled by hand as far uphill as on the level or downhill. Fan-shaped units in a drainage head may be particularly troublesome in this respect
. Economics and design of a radio-controlled skyline yarding system. Logging, Skyline. Fan-Shaped Unit A fan-shaped unit is generally used when a cutting unit is laid out in a drainage head (fig. 7). A single spar is used at the landing and the skyline roads radiate to tail spars spaced along the outer edge of the unit. Note that each skyline is not in the center of the road or area to be logged, because the weight of the butt- hook and chokers cannot be pulled by hand as far uphill as on the level or downhill. Fan-shaped units in a drainage head may be particularly troublesome in this respect, due to the amount of sloping ground frequently encountered. .—A fan-shaped unit with skyline roads radiating from a Solid lines are skylines and dashed lines indicate area served skyline. Contour lines are also 10 Fan-Shaped Unit with High-Lead Yarding from the Reverse Slope A combination of high-lead yarding with a skyline crane swing to a landing may often be practical (fig. 8). This may require a com- bination yarder-snubbing machine at the top of the unit. Such a machine could be used to high lead and cold deck at the tail spar as well as serve as a skyline crane snubbing machine. In cases where large volumes are available, it may be practical to move a sep- arate high-lead yarder to the tail tree and use a hot-deck swing operation. Should the capacity of the skyline crane be greater than the high-lead machine, the skyline crane can work as a yarding unit on the skyline road until a sufficient cold deck is available for a max- imum capacity swing. Alternating skyline yard- ing and swinging will maximize the production of the logging system. 8.—Fan-shaped skyline unit with high-lead yarding from the 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 Binkley, Virgil Wayne; Pacific Northw
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