Skyline logging production in the southern Sierra Nevada mountains: a case study Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/1c18dm28g

Graduation date: 1979

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  • This paper describes the results of a time study conducted on the Sierra National Forest to determine production capacity of the Madill 044 Skyline Yarding Crane operating in a partial cut situation for old-growth mixed conifer stands. The yarder was rigged in the running skyline configuration and used a Danebo mechanical slackpulling (MSP) carriage. Yarding distances ranged from 40 to 900 feet and lateral yarding distances ranged from 0 to 185 feet. An average of 35 thousand board feet of timber per acre was removed from the study area. - Regression equations were developed for the individual elements of the yarding cycle and for total cycle time. Results indicate that skyline yarding distance, lateral yarding distance and number of logs per turn are the most significant variables related to predicting total turn time, with cubic volume per turn and the number of workers on the rigger crew playing a less important role. A couiparison of the regression developed for the Madill 044 with another regression model for a Washington Iron Works 108 skyline yarding crane suggests that there is an approximate 33% difference in total turn times predicted for the same logging conditions.
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