Table 8 . --Average times for logging tasks and aharaater of average turn 

 (TOT = total operating time) (RTT = Round trip time) 



Skidding Method 







Skidder 







Horse 







Tractor 







Min- 



: % of 



% of : 



Min- 



% of 



% of 



: Min- 



% of 



% of 



Element (task) 



utes 



: TOT 



RTT : 



utes 



TOT 



RTT 



: Dtes 



TOT 



RTT 



Time out 



2.8 



14.0 



15.8 



1.5 



18.1 



18. 1 



3. 3 



12.4 



14.7 



Time in 



2.5 



12.5 



14. 1 



1.8 



21.7 



21.7 



3.4 



12.8 



15.1 



Hook time 



7.2 



36. 1 



40.7 



2.0 



24.1 



24. 1 



7.8 



29.3 



34.7 



Bunch time 



3.3 



16.5 



18.6 



2.6 



31.3 



31. 3 



5.6 



21 . 1 



24.9 



Unhook time 



1.9 



9.5 



10.7 



.4 



4.8 



4.8 



2.4 



9.0 



10.7 



Round-trip time 



17.7 







8.3 







22.5 







Landing time 



2.0 



10.0 





.0 



.0 





3.7 



13.9 





Total 



Operating time 20.0 8.3 ' 26.6 



Turn character 



No pc/turn 11.5 3.7 12.1 



Dist. (ft) 254.0 164.0 260.0 



Slope (%) 19.0 22.0 21.0 



Production 



Pc/8 h 168.0 125.0 ' 112.0 



Vol/Sh-ft^ 795.0 621.0 505.0 



Table 8 presents the average times for separate logging tasks and character of the 

 average turn for different skidding methods. The effect of labor can be estimated by 

 comparing the labor-intensive tasks--hook time and unhook time. Because bunching time 

 is part of the hooking process for horse skidding, it is necessary to include bunching 

 for the skidder and tractor skidding for comparative purposes. The percent of round 

 trip time, which excludes landing time, was: 



Hook time 

 Bunch time 

 Unhook time 

 Total 



70.0 



Skidder Horse Tractor 



(Percent) 



40.7 24.1 34.7 



18.6 31.3 24.9 



10.7 4.8 10.7 



60.2 



70. 



The total percentage of round trip time was as expected. That is, horse skidding 

 ought to be lower than for the other skidding methods. The average number of pieces per 

 turn explains this--3.7 for pieces horse skidding, 11.5 pieces for the skidder, and 

 12.1 pieces for the tractor. 



Table 9 shows a production comparison on an 8-hour shift basis. Because the shift 

 hours were not the same for all three skidding methods, the gross shift production is 

 presented on an assumed 8-hour shift. Because horse skidding had no landing time, this 

 will tend to distort horse skidding production time. This distortion is eliminated by 

 including the column headed "% of # RTT", which is percent of round trip time, excluding 

 landing time, for all three skidding methods. 



14 



