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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 ...
Early on, it was customary to trim and top a tree making it into a 'spar pole' or 'spar tree' for the purpose of supporting the head blocks but gradually the use of wooden spars gave way over the 20th century to the use of steel spars stood up for the purpose. In any event the spars are supported by a number of guy wires. [1]
High Lead logging in Western Oregon Cable grue Larix 3T, installed on agricultural tractor. Cable logging, also referred to as skyline logging, is a logging method primarily used on the West Coast of North America with yarder, loaders, and grapple yarders, but also in Europe (Austria, Switzerland, Czech Republic, France, Italy).
Logging is the beginning of a supply chain that provides raw material for many products societies worldwide use for housing, construction, energy, and consumer paper products. Logging systems are also used to manage forests , reduce the risk of wildfires , and restore ecosystem functions, [ 2 ] though their efficiency for these purposes has ...
The unit cost of the feller buncher is primary affected by the tree size and the tree volume. [10] The unit felling cost is lower when the tree size increased. For example, tree with 5 inches at DBH has the unit cost of $70 while tree with 15 inches at DBH has the unit cost of $12. As the cost of feller buncher is high, only large tree volume ...
Spar tree at a logging camp in the United States, 1924. A spar tree is the tree used as the highest anchor point in a high lead cable logging setup. The spar tree is selected based on height, location and especially strength and lack of rot in order to withstand the weight and pressure required.
Tree harvester (Click for video) 6-wheeled Valmet harvester Small 4-wheeled Rottne harvester Timberjack harvester John Deere harvester in SwedenA harvester is a type of heavy forestry vehicle employed in cut-to-length logging operations for felling, delimbing and bucking trees.
The high climber (also known as a tree topper) established a spar tree so logs could be skidded into the landing. Using tree climbing gaffs and rope to ascend a tall tree in the landing area of the logging site, he would chop off limbs as he climbed, chop off the top of the tree, then attach pulleys and rigging to the tree for the yarder.
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