A grapple yarder is a piece of large crawler tracked
They have since replaced
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Yarder — A yarder is piece of logging equipment which uses a system of cables to pull or fly logs from the stump to the landing. It generally consists of an engine, drums, and spar, but has a range of [http://www.cnr.vt.edu/visser/cable… … Wikipedia
Cable logging — is a logging method primarily used on the West Coast of North America with yarder, loaders and grapple yarders.The cables can be rigged in several configurations.There are two classes.# High Lead, in which a simple loop of cable runs from the… … Wikipedia
Swing yarder — 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… … Wikipedia
