Table 5.— Potential productivity rates based on time studies of the various logging 

 functions by study unit 



Unit 



Function I 11 III IV 



Shear 

 and 

 bunch 



Felling 



Trees/liour ' 88 



Limb and buck 



Trees/hour 46 



Posts/hour 68 



Skid 



Distance (feet) 874 



Turns/hour 11.8 



Pieces/hour 31.8 



'Includes 46 trees felled with saw. 

 ^Includes 18 trees felled with saw. 



Saw Shear Saw 

 and 

 bunch 



38 ' 69 40 



55.7 30.4 46.3 



71 — — 



1,195 730 1,032 



2.7 9.5 2.0 



20.3 21.9 20.4 



Table 6.— Average times and standard deviation, in parenthieses, for thie skidding variables on the 

 study units 



Unit 



Variable I II III IV 



Minutes 



Hook 





3.5 (1.0) 





9.3 (2.0) 



Unhook 





.9 (0.5) 





.5 (0.2) 



Travel 



3.8(1.1) 



10.3 (3.0) 



4.5 (2.2) 



15.7 (3.8) 



Round trip (turn) 



3.8 



14.7 



4.5 



25.5 



Delay 



.9 



3.5 



1.8 



4.7 



Landing 



.4 



3.7 





.1 



Turns/hour 



11.8 



2.7 



9.5 



2.0 



Pieces/turn 



2.7 



7.4 



2.3 



10.3 



Pieces/hour 



31.8 



20.3 



21.9 



20.4 



Volume/piece (ft^)^ 



18.4 



14.5 



20.1 



21.2 



Volume/hour (ft^ 



585.1 



294.3 



440.2 



432.5 



'l-anding time not recorded as the log handling was done with a machine other than the skidding tractor. 

 ^Does not include unmerchantable material to chipper. 



5 



