Cable systems

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