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SP-10-12 motor-manual harvesting of tree length

Felling, directly followed by delimbing and topping at the predefined diameter. Important: felling direction in order to minimize the damage in stand at the pre-skidding and extraction operations

Functiogram:


Advantages

  • Very flexible, nearly every tree can be processed
  • No dependency on skid roads
  • Low investment cost
  • Low relocation cost
Limitations, thresholds
  • High need for skills with increasing stem volume
  • Dangerous work
  • Cost with low productivity
  • Effort: heavy cardio-vascular workload
  • Need to have at least another (or other 2 workers) at the worksite. Cannot work alone (legal obligation in some countries, in some certification schemes, too)
Main use
  • Standard at sites with tree-length skidding
  • Broad-leaved trees, tree volume too high for harvester or stand not accessible for harvester
Economic suitability
Example 
  • machine costs without personal costs: 4.00 Euro/h
  • personal costs per person: 35.00 Euro/h
  • number of persons involved: 1
  • in total: 39.00 Euro/h
  • regression formula
    • b0 = 15
    • b = 15
 


Ecological suitability:

  • Ecogram 



Social suitability:

  • S-class: no contact with forest road -> S5
  • E-class: motor-manual work, very heavy and dangerous work -> E2 

» Technodiversity Glossary

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