1. Home
  2. Items
  3. Skidding and Yarding Options for Smallwood
PDF

Skidding and Yarding Options for Smallwood Item Info

This study compares performance, production, and costs of horse skidding methods in smallwood thinning operations in North Idaho forest. Two types of skidding operations were observed. A conventional single piece skidding method were compared to those required in pre-bunching system, where the logs were felled, bucked and pre-bunched during the felling activities by the sawyer. Evaluation of the system productivity through detailed time and production studies led to the development of predictive models of the work cycle elements. A higher piece rate production is obtained by skidding in bundles than with the conventional skidding method. No gains in volume per load were observed using either method, however, greater utilization and more product recovery was observed using the pre-bunching method. Under case study conditions of equal piece size the skidding cost is more sensitive to skidding distance in conventional skidding than skidding pre-bunched material. For total thinning costs under equal piece size conditions there was no break-even point between skidding methods. The pre-bunching skidding method had a lower cost for all distances analyzed. The pre-bunching skidding method is recommended when a greater degree of material utilization is desired and for longer skidding distances.

View on Timeline View on Map
Library Catalog Link Download Preview PDF

Please note: PDF file may not be complete document.

Title:
Skidding and Yarding Options for Smallwood
Creator:
Carey, Patricio
Date Created:
1987-09
Description:
This study compares performance, production, and costs of horse skidding methods in smallwood thinning operations in North Idaho forest. Two types of skidding operations were observed. A conventional single piece skidding method were compared to those required in pre-bunching system, where the logs were felled, bucked and pre-bunched during the felling activities by the sawyer. Evaluation of the system productivity through detailed time and production studies led to the development of predictive models of the work cycle elements. A higher piece rate production is obtained by skidding in bundles than with the conventional skidding method. No gains in volume per load were observed using either method, however, greater utilization and more product recovery was observed using the pre-bunching method. Under case study conditions of equal piece size the skidding cost is more sensitive to skidding distance in conventional skidding than skidding pre-bunched material. For total thinning costs under equal piece size conditions there was no break-even point between skidding methods. The pre-bunching skidding method had a lower cost for all distances analyzed. The pre-bunching skidding method is recommended when a greater degree of material utilization is desired and for longer skidding distances.
Document Type:
Thesis
Library Call Number:
SD539.C3 1987
Subjects:
horse skidding horse logging cost comparison North Idaho forest operations
UIEF Unit:
UIEF
Location:
UIEF
Latitude:
46.869607
Longitude:
-116.733856
Department:
Department of Forest Products
Type:
text
Format:
application/pdf

Contact us about this record

Source
Preferred Citation:
"Skidding and Yarding Options for Smallwood", UIEF Research Exchange, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/uief/items/uief_0018.html
Rights
Rights:
In copyright, educational use permitted.
Standardized Rights:
http://rightsstatements.org/vocab/InC-EDU/1.0/
« Previous Back to Browse Next »