engleski

EXPLOITATION AND PRODUCTIVITY CHARACTERISTICS OF THE NEW CROATIAN SKIDDERS ECOTRAC 55 V AND ECOTRAC 120 V

This paper presents exploitation characteristics and research results of the Croatian skidders ECOTRAC 55V and ECOTRAC 120V productivity in timber skidding in hilly and lowland regeneration fellings using the half-lenght method. The average load per cycle is 1.80 m3 for the ECOTRAC 55V skidder and the average piece volume is 0.64 m3. The achieved average load per cycle for the ECOTRAC 120V skidder is 2.78 m3, and and the average piece volume is 0.35 m3. For the skidding distance of 300 m, on skidding trail and felling site, and 50 m on landing, the total time per cycle of the ECOTRAC 55V is 14.76 min, standard time is 8.20 min/m3 and daily output of the skidder is 58.53 m3. The ECOTRAC 120V skidder total time per cycle is 30.28 min, standard time is 10.89 min/m3, and daily output of the skidder is 44.08 m3. Daily cost of timber skidding by the ECOTRAC 55V skidder for the distance of 300 m is 164.76 EUR/day or 2.82 EUR/m3. On the other hand, for the skidder ECOTRAC 120V, for the same distance, it amounts to 217.86 EUR/day or 4.94 EUR/m3. Comparing the two work sites while researching the productivity of skidders it is obvious that the productivity mostly depends on average load volume, skidding speed, working time on the felling site and on the landing.

skidder; exploitation characteristics; productivity; daily output; unit cost

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