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Ropeway systems where timber is extracted by means of moving cables, powered by a static tractor or lorry powered winch. The timber load can be carried wholly or partially clear of the ground. Examples include skyline and high lead systems
High lead systems | |
---|---|
Availability | No data |
Costs | Low capital cost, with competitive unit costs over shorter extraction distances |
Terrain ability | Suitable for use on steep banks and wet soils |
Potential site impact | Low ground impact and site disturbance |
Potential crop impact | Some potential for stem damage |
Access and transportation | Allows access to difficult sites |
Other operational considerations | Best suited to extraction distances of up to 150 m, depending on concavity of terrain. Best suited to small thinnings or shorter extraction distances, and high product density. Low load capacity. Substantial setup time, but lower than other cable systems. Stacking space required at roadside. May require secondary extraction |
Ergonomics | Some manual handling involved |
Gravity systems | |
---|---|
Availability | No data |
Costs | Low capital cost, but competitive unit costs over shorter extraction distances |
Terrain ability | Suitable for steep banks |
Potential site impact | Low ground impact and site disturbance |
Potential crop impact | Some stem damage risk |
Access and transportation | Allows access to difficult sites |
Other operational considerations | Best suited to extraction distances of up to 300m. Best suited to small thinnings or shorter extraction distances, and high product density. Low load capacity. Substantial setup time, but lower than other cable systems. Stacking space required at roadside. May require secondary extraction |
Ergonomics | Some manual handling involved |
Skyline systems | |
---|---|
Availability | No data |
Costs | High capital cost and high unit costs, generally only used on sites where other methods are not an option |
Terrain ability | Allows access to difficult sites, suitable for use on steep banks and wet soils |
Potential site impact | Low ground impact |
Potential crop impact | Some stem damage risk |
Access and transportation | Allows access to difficult sites |
Other operational considerations | Best suited to extraction distances >300 m. Best suited for high product density due to high unit cost. Low load capacity. Substantial setup time |
Ergonomics | Some manual handling involved. High level of skill required |
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