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A swing yarder is a mobile piece of heavy duty forestry equipment used for pulling logs from the woods to a logging road with cables. The swing yarder is also known as a grapple yarder. In any logging operation, it is necessary to transport the harvested tree from the stump to a landing for transport to market (usually on a truck). If the ...
A choker setter or choke setter is a logger who attaches cables to logs for retrieval by skidders or skylines. [ 1 ] [ 2 ] The work process involves the choker setter wrapping a special cable end (choker) around a log and then moving clear so the yarding engineer (e.g. skidder operator) can pull the log to a central area.
The whistle operator was known as a whistle punk, [16] [17] who was placed between the men attaching the cables (choker setters), [18] and the donkey puncher, so that he could see the choker setters. [16] [19] When the cables were attached, a series of whistle blows signaled the donkey to begin pulling and the choker setters to stay out of harm ...
Wirkkala invented and developed the high lead method of logging.This skyline (or "spar") method, ideally suited for steep terrain, revolutionized the industry. He also invented important pieces of that industry's machinery used during the first half of the 20th century, including the ubiquitous choker hook.
A skyline yarder can pull in 5 to 10 logs at a time, using separate chokers. The pulleys are mounted on towers or cranes, other trees, ridges, or, in rare cases, helium balloons. Satellite photograph of industrial-scale skyline logging in the Tierras Bajas project in eastern Bolivia, showing deforestation and its later associated replacement by ...
[12] [32] In 1915, George Hume purchased a third Shay engine and more log cars and yarding engines, expanding the company's logging equipment to include 70 railroad cars, three locomotives, 12 steam donkeys, one McGiffert loader, and one railroad crane. The company hired 1,500 men for the 1916 season, preparing for one of its heaviest cuts on ...
Shovel logging, sometimes called Hoe Chucking, uses a log loader to swing logs to the forest road. Shovel logging is one of a number of methods that may be used to move logs from forest to road. Rather than driving out to the log and dragging it back to the landing, the loader moves slowly across the harvest area, grabbing logs/trees within ...
Lombard began building 6-cylinder gasoline-powered log haulers in 1914, produced a more powerful "Big 6" later, and built one Fairbanks-Morse Diesel engine hauler in 1934. The internal combustion log haulers (called Lombard tractors) were less powerful than the steam log haulers; and resembled a stake body truck on a skis and tracks chassis.