engleski

Skidder with single-drum or double-drum winch in mountainous areas – A case study from selective forests of Croatia

In selection forests of Croatia, because of the stand and extraction factors, we are generally compelled to use skidders for the primary transport of wood. Most of the skidders used in Croatian forestry are equipped with a double-drum winch. Of the 45 Timberjack 240C skidders 30 are equipped with a double-drum, and 15 with a single-drum winch. Between 0.25 mil. m3 and 0.30 mil. m3 of round-wood is annually skidded with these machines, mainly in hilly and mountainous regions of our country. This study was set up to determine the difference in single-drum equipped skidder’s productivity and double-drum equipped skidder’s productivity. By applying time and motion study methods half-length skidding work process in selective cut was recorded. The differences between the speeds, fixed times consumptions and load volume were analysed by a T-test. Daily outputs based on the eight-hour work time were calculated. It was found that the skidder equipped with a single-drum winch achieved from 11% to 9% lower projected daily output at distances from 100 m to 800 m than the skidder equipped with a double-drum winch.

timber skidding; productivity; Timberjack 240C

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