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Poplar
2021, Issue 208, p. 5-13

Original scientific paper
DOI: 10.5937/topola2108005M
UDC: 656.137

Influence of stand and terrain characteristics on the productivity of the Timberjack 240b tractor in pure beech stands


Boban Miletić 1*, Milorad Danilović 2, Todor Đorem 1, Branislav Filipić 3, Marko Gutalj 1


1 University of East Sarajevo, Faculty of Agriculture, Istočno Sarajevo, Republic of Srpska, Bosnia and Herzegovina
2 University of Belgrade, Faculty of Forestry, Belgrade, Serbia
3 University of Novi Sad, Faculty of Agriculture, Novi Sad, Serbia

Corresponding author:
Boban Miletić, E-mail: boban.miletic@pof.ues.rs.ba


Abstract

This paper presents the results of research of the Timberjack 240b tractor equipped with a double-drum winch (work form 1 Tractor driver + 0 Assistant) in beech stand at an average elevation of 983.73 m. The research was conducted using the time and work study method, with the help of GIS technology in certain segments of research. The achieved working hours consist of 75.44% effective time and 24.56% delay time. The delay time coefficient is 1.33. In total, 47 transport cycles were realized, with 66 stopping points, an average of 1.41 per transport cycle. The average skidding distance was 221.19 m. In total, 363 logs (204.04 m3) were collected by 79 winches. The average load volume was 4.34 m3 and consisted of 5.43 pieces. Loaded tractor skidding time is strongly influenced by skidding distance and load volume in interaction with the longitudinal slope of skidding trails. To increase tractor productivity, it was concluded that the skidding roads should be built with the smallest longitudinal slope possible. Preferably, logs should be skidded downhill.


Keywords: Timberjack 240b, beech, slope, GIS, 1T+0A
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