HARVESTING ACTIVITY 



Production was determined for three different ground skidding systems in five 

 logging units skidded as follows: 



Logging Unit Skidding System 



1 Rubber-tired skidder 



2 Small, tracked tractor 



3 Horse, Rubber-tired skidder 



4 Horse 



5 Rubber-tired skidder 



Unit 3 was originally assigned to be horse skidded. Excessive steepness prevented 

 horse skidding the entire unit; hence, the rubber-tired skidder was used on part of 

 that unit. 



The sale originally specified a 2 1/2-inch minimum top diameter and green material 

 only. This was later changed to "logger's choice," which meant the purchaser had the 

 option of taking or leaving any of the dead material. Green tree lengths were utilized 

 up to the legal hauling length limit of 50 feet and some lengths exceeded this limit. 

 There was no diameter limit. For dead material, the minimum top diameter was 2 1/2 

 inches and the trees had to be free of rot. Table 3 summarizes the operating conditions 

 for each unit. 



Table l .--Operating constraints and ipvaatioes for eaoh logged wait 



Unit 



: Utilization ; 

 : standard ; 



Prelog ; 

 activity ; 



Skidding 

 constraints 



1 



Full tree, 

 green and 

 sound dead ' 



Stumps to ground 

 level; direct fall 

 uphil 1 



None 



2 



Full tree, 

 green and 

 sound dead 



Stumps to ground 

 level; direct fall 

 uphill 



None 



3 



Full tree, 

 green and sound 

 dead 



Stumps to ground 

 level; direct fall 

 uphill 



Steep portion 

 required diagonal 

 slope skidding 



4 



2 1/2-inch top 

 d. i.b. ; green 

 material 



Stump height; 



less than 12 inches 



Skidding followed 

 prepared skid 

 trails 



5 



2 1/2-inch top d.i.b.; 

 green material . 

 (Some dead removed 

 for roadside decking.) 



Stumps to 

 ground level; 

 direct fall 

 uphill 



None 



5 



