Technodiversity Glossary

Tree-lengths are dragged to the landing by a tractor equipped with a single or double-drum winch. The winch is used for assembling the load and for pre-skidding the tree-lengths to the skid trail if necessary.

Functiogram

• Independent pre-skidding and extraction capacity in one unit
• Can operate on steep terrain, if skid trails are available at a suitable spacing
• Can work in small lots if skidder is road legal

• Slow (pre-skidding)
• Need an assistant (chokerman) and/or the driver needs to leave the cab (uncomfortable)
• Limited load capacity

• Mountain operations
• Small-scale forestry
• Traditional extraction method when crosscutting should not be done before reaching the forest road (or the customer)

Economic suitability

Example:

• machine costs without personal costs: 65,00 Euro/h
• personal costs per person: 35,00 Euro/h
• number of persons: 2
• in total: 135,00 Euro/h
• regression line minutes per tree
  • b₀ = 4,0
  • b₁ (tree volume) = 2,0
  • b₂ (skidding distance) = 0,005

Ecological suitability

Ecograms 

Social suitability:

• S-class: unloading tree length on the road -> S3
• E-class: simple machine work, heavy and dangerous -> E3

Logging arch study for farm tractors - Merlo study etc.