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  • Simulating skyline yarding in thinning young forests

    Creator:
    Sinner, Hans-Ulrich
    Abstract:
    Cable logging systems are being applied frequently in thinning young-growth forests, but the dynamics of these systems are relatively unknown. This study is part of a research project to develop aerial logging systems for thinning and to analyze them for economic, silvicultural, and environmental implications. The objectives of my study...
    Resource Type:
    Masters Thesis

  • Simulation of a helicopter yarding system in old growth forest stands

    Creator:
    LeDoux, Chris B.
    Abstract:
    Helicopter yarding systems have become a popular tool in removing timber from steep slopes, sensitive soils, limited access areas, and environmentally sensitive stands. Little is known about the system's dynamics. This study is part of a research project to explore "advanced" logging systems as to their economic efficiency and environmental...
    Resource Type:
    Masters Thesis

  • A study of the coefficient of drag resistance in yarding logs

    Creator:
    Henshaw, John Robinson
    Abstract:
    This study was conducted to examine the coefficient of drag resistance (µ) between a log and bare forest soil during partial suspension yarding. Drag resistance in this study was defined as the resistance due to friction between the soil and the log plus the resistance due to the plowing action...
    Resource Type:
    Masters Thesis

  • Prebunching with a low investment skyline yarder in thinnings

    Creator:
    Keller, Robert Richard
    Abstract:
    This study compares the production rates and yarding costs of prebunching with a low investment skyline yarder and swinging with a larger skyline yarder to full-cycle thinning with the larger yarder The study analyzes two slackpulling techniques (manual and haulback assisted) and two carriages (a multi-span carriage and a clamping...
    Resource Type:
    Masters Thesis
    Full Text:
    WITH A LOW INVESTMENT SKYLINE YARDER IN THINNINGS Abstract approved: D. Edward Aulerich This study