Skidding methods and equipment . --Two conventional mobile skidding methods were 

 compared: a crawler tractor (Danby Ridge) and a rubber-tired skidder (Lee Creek) . 



1. Crawler tractor (fig. 5) . The crawler tractor evaluated was an old Cater- 

 pillar Model D2, a machine used for light-duty construction, forestry, and 

 farming. Skidding was accomplished by placing two or three chokers over a 

 drawbar pin. Usual skidding procedure was to drag one to three logs to the 

 edge of the long axis of the area. Because the tractor lacked a blade, little 

 bunching of the logs was possible. The operator was instructed to skid all 

 sound pieces and to attempt to skid unsound pieces. Machine down time was 

 common. A total of 9 full and partial days were required to complete the 

 skidding of the 5-acre (2.02-ha) tract. 



Figure 5. — Relogging Danby Ridge with small crawler tractor. 



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