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SP-13-23 manual pre-skidding of short logs

Short logs can be moved manually by workers by throwing them downhill, or sliding them with the use of sappies or chutes.

 

Functiogram



Advantages
  • Limited (or no) investment for manual sliding
  • Capacity to deal with almost any terrain conditions 
  • Limited impact
Limitations, thresholds
  • Short distance only
  • Downhill if sliding or throwing 
  • Very low productivity
  • Only works with relatively small and short logs that are within the weight capacity of human power
Main use
  • Small scale forestry 


Economic suitability

Example:

  • machine costs without personal costs: 0,00 Euro/h
  • personal costs per person: 35,00 Euro/h
  • number of persons: 1
  • in total: 35,00 Euro/h
  • regression line minutes per tree
    • max. load per cycle 0,1
    • b0 = 2,0
    • b1 (tree volume) = 1,0 
    • b2 (skidding distance) = 0,025


Ecological suitability

Ecogram 



Social suitability:

  • S-class: no contact with forest road -> S5
  • E-class: manual work, very heavy and dangerous -> E1

Literature:


» Technodiversity Glossary

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