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SP-11-31 pre-skidding and skidding of full trees with yarder

Full trees are moved to a landing (roadside landing, landing pad etc.) suspended under a carriage that runs on a cable (skyline). In a limited corridor tress can be pre-skid to the skyline as well before they are extracted. 
Different types and configurations are available (live, standing, running skyline, self-propelled carriage, swing yarders - carriages with cable or grapple).


Functiogram



Advantages
  • capable of working in steep terrain
  • less soil disturbance than for ground-based
  • capable of pre-skidding loads (drop line)
  • can work with limited road network
Limitations, thresholds
  • Relatively long set-up and dismantle time
  • Fixed set-up and dismantle time require relative intensive removal (ca. 0.5-1 m3/ m line)
  • High planning effort
  • Requires high operator skill
Main use
  • Mountain operations
  • Alpine forestry
  • Developing on soft terrain as reduced-impact alternative to ground-based extraction


Economic suitability

Example:

  • machine costs without personal costs: 100,00 Euro/h
  • personal costs per person: 35,00 Euro/h
  • number of persons: 3
  • in total: 205,00 Euro/h
  • regression line minutes per tree
    • b0 = 1,0
    • b1 (load volume) = 0,5
    • b2 (logging distance) = 0,015
  • plus costs for installation and dismantle of the cable system


Ecological suitability

Ecogram



Social suitability

  • S-class: unloading full trees on forest road -> S3
  • E-class: simple machine work, heavy and dangerous -> E3

Literature:

Spinelli R.,  Marchi E., Visser R., Harrill H., Gallo R., Cambi M., Neri F., Lombardini C., Magagnotti N. (2017) The effect of carraige type on yarding productivity and cost. International Journal of Forest Engineering - Accepted paper.

Spinelli R., Magagnotti N., Visser R. (2015) Productivity models for cable yarding in Alpine forests. European Journal of Forest Engineering 1, p. 9-14.

Spinelli, R., Magagnotti, N. (2011) The effects of introducing modern technology on the financial, labour and energy performance of forest operations in the Italian Alps. Forest Policy and Economics, 13 (7), pp. 520-524.

Huyler, N., LeDoux, C., 1997. Cycle-time equation for the Koller K300 cable yarder operating on steep slopes in the Northeast. Res. Pap. NE-705, USDA Forest Service, Northeastern Forest Experiment Station 4 p.

Senturk, N., Ozturk, T., Demir, M., 2007. Productivity and costs in the course of timber transportation with the Koller K300 cable system in Turkey. Building and Environment 42: 2107-2113.

Stampfer, K., Visser, R., Kanzian, C., 2006. Cable corridor installation times for European yarders. International Journal of Forest Engineering 17: 71-77.

Zimbalatti, G., Proto, A., 2009. Cable logging opportunities for firewood in Calabrian forests. Biosystems Engineering 102: 63-68.

 

 

 


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