The production potential of the Ingland-Jones Trailer Alp yarder in thinning young growth northwest conifers: a case study Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/6q182r35v

Graduation date: 1978

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  • Results of a recent production study indicate that a four man crew thinning young growth Douglas-fir [Pseudotsuga mensiezii (Mirb.) Franco] with an Iglarid-Jones Trailer Alp can produce 1360 to 1460 cubic feet (38 to 41 cubic metres; 8160 to 8750 bd. ft.,) per eight hour day on slopes of 10 to 50 percent with average slooe distances of 150 to 300 feet (46 to 91 metres) and average lateral yarding distances of 30 to 50 feet (10 to 15 metres). The stand studied was thinned from 226 stems per acre (558 stems per hectare) to 130 stems per acre (321 stems per hectare). The average tree size removed was 19.4 cubic feet (0.55 cubic metres) and the average log size yarded was 12.9 cubic feet (0.36 cubic metres). A standing skyline system was used with a haulback line attached to hold the carriage in position during lateral yarding. The cost of a four man crew felling, bucking, and yarding this material with an average slope distance of 250 feet (76 metres) and an average lateral yarding distance of 35 feet (11 metres) is estimated at $36.63 per cunit ($12.93 per cubic metre; $61 .04 per Mbf.). A three man crew operating under the same conditions would produce only 1160 cubic feet (33 cubic metres; 6950 bd. ft.) per day but the unit cost of production would be lower at $35.30 per cunit ($12.46 per cubic metre; $58.83 per Mbf.). During the study, operating delays accounted for 26 percent 0f total study time and skyline road changes accounted for 10 percent of total study time. The use of intermediate supports can successfully extend yarding distance on unfavorable slopes and can facilitate efficient decking if placed within 100 feet (30 metres) of the landing.
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