Abstract
UDK: 630*31:630*36
 In the paper is conducted comparison of the wheel slip of the two different skidders in the equal conditions of extraction (equal loads and slopes of the tractor road and skid trail). The first skidder in the research is ECOTRAC 120 V of the Croatian manufacturer Hittner d.o.o. with the mechanical transmission and the other skidder is of the Slovenian manufacture WOODY 110 with the hydrostatic transmission. 
 Wheel slip of the skidder during the research is determined on the basis of the number of wheel rotations. Distance travelled is calculated from the multiplied number of rotations of the fifth wheel and its circumference.
 During the extraction downhill, the wheel slip is negative. Generally, it could be said that, in the same conditions during the extraction uphill, wheel slip is increased with the increase of load weight and during the extraction downhill are less negative values of slip with the increase of the load weight. 
 By comparing the wheel slip at the researched skidders are established the advantages of the hydrostatic mechanic transmission during the wood extraction uphill. But, during the extraction downhill, with the mechanic transmission are achieved less wheel slips.
Highlights
In the paper is conducted comparison of the wheel slip of the two different skidders in the equal conditions of extraction
Research goal is the comparison of wheel slip of the two different skidders in the equal conditions of extraction
The first skidder in the research is ECOTRAC 120 V, of the Croatian manufacturer Hittner d.o.o. with the mechanical transmission and the other skidder is of the Slovenian manufacture WOODY 110 with the hydrostatic transmission
Summary
For the determination of the tractive characteristics of the skidder, several measurement devices were designed or purchased and applied for the simultaneous measurement of the following values: 1. Torques on each wheel, M (Nm), 2. Measurement of the dynamic wheel loadss and torques at the skidders ECOTRAC 120 V is performed with the application of the strain gauges positioned on the construction of the skidder, that is, on the upper side of the shaft's housing and on the circumference of the housing of the final planetary gears. In the measurement of the skidder WOODY 110 wheel doses/dynamometers with the build in strain gauges for each were constructed for measuring of the dynamic wheel loads and torques (Figure 1). Determining of the horizontal and vertical component of the force in a rope during the wood extraction at the both researched skidder has been performed with the application of the two dynamometers. The fifth wheel is positioned in the articulated manner on the front board of the skidder (Figure 4 and 5) and the length of the distance travelled is determined on the basis of its number of rotations and measured circumference of the wheel. The masses of all wood assortments are measured, which are used in the tractive tests
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