Technodiversity Glossary

Tree lengths that are pre-skidded to the trail are skidded to the forest road using a clam-bunk skidder. This includes: loading the trees with the crane into the clam-bunk, skidding them to forest road, storing them alongside road or a landing.

Functiogram

Advantages

• compared with full trees you can build bigger loads (about 30%)
• compared with skidder, the driver can remain in the cabin
• high productivity    

Limitations, thresholds

• Large machine, very heavy and expensive
• limited maneuverability, clumsy

Main use

• Traditional extraction method when crosscutting should not be done before reaching the forest road (or the customer)
• high extraction volume like clear-cuts or wind-throws

Economic suitability

Example:

• machine costs without personal costs: 90,00 Euro/h
• personal costs per person: 35,00 Euro/h
• number of persons: 1
• in total: 125,00 Euro/h
• regression line minutes per tree
  • b₀ = 0,5
  • b₁ (tree volume) = 2,0
  • b₂ (skidding distance) = 0,01
  • 
    

Ecological suitability

Ecograms

Social suitability

• S-class: unloading tree length on the road -> S3
• E-class: advanced machine work, moderate -> E4

Literature:

Logging arch study for farm tractors - Merlo study etc.