engleski

Timber extraction technologies in Croatian mountainous selection forests

Terrain conditions determine the ability of people and mobility of vehicles in carrying out forest works. In timber extraction from hilly-mountainous selection forests in Croatia, the most important factors of mobility in forest off road areas are terrain slope, surface obstacles and bearing strength. Due to slopes and stand conditions of Croatian selection fir-beech forests, the cable skidder and yarder are the most common means of extraction. In this paper an overview is given of investigation of beech stems cable yarding by the Steyr KSK 16 mobile tower yarder. Research results are also given of the Timberjack 240C cable skidder while skidding long fir roundwood from the stand opened through a strip road network. Some harvesting parameters of investigated machines are shown, such as: average unloaded and loaded travelling speeds, felling site and landing time consumption, allowance time, realized load volumes and possible efficiencies, standard times and costs per unit depending on yarding (skidding) distances.

extraction on the slope; cable skidder; yarder; efficiency; cost per unit

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