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Heli-Logging, or Helicopter Logging, is a method of logging that uses helicopters to remove cut trees from forests by lifting them on cables attached to a helicopter.〔(Heli-Logging ) at Forestry.com〕 Helicopter logging is often used in inaccessible areas of forests. Because the use of helicopters reduces the level of infrastructure required to log in a specific location, the method also helps to reduce the environmental impact of logging. It also can increase the productivity in these remote areas.〔(An Analysis of Utilizing Helicopter Logging in Turkish Forestry )〕 == History == Standing Stem Harvesting, a selective harvesting method within Heli Logging, was invented by Philip Jarman of Port Alberni, British Columbia between May and October 1997. The initial harvesting equipment used wire rope or chokers to rig the stem and a modified external hook to engage the choker and lift the stem clear of the stump. In this way the process of harvesting, which includes climbing, measuring, cutting, rigging, and lifting was pioneered by a single pilot flying a light utility helicopter. In 1998, the inventor supervised the building of an experimental grapple which was to be operated by a K-Max Lift Truck helicopter. However, because the K-Max had no hydraulics, it was necessary to design and install an externally mounted, jettisonable sled carrying a hydraulic power pack, to operate the grapple. Initial flight trials were carried out using the external hook and wire rope configuration on the 25th of April 1998. In late October 1998, a successful full scale harvesting trial using a grapple designed by the inventor and funded by the timber licensee was carried out at Lunchtime Lake on Vancouver Island. Press releases and logging industry recognition followed. Patent applications in the United States and Canada were submitted and granted in 2001 and 2002 respectively. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Heli-logging」の詳細全文を読む スポンサード リンク
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