Browsing by Author "Krieg, Benno Wolfgang"

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    Using the Leykam Logline to evaluate chuting in South Africa
    (Stellenbosch : Stellenbosch University, 1991-10) Krieg, Benno Wolfgang; Warkotsch, W.; Stellenbosch University. Faculty of AgriSciences. Dept. of Forest & Wood Science .
    ENGLISH SUMMARY: Timber harvesting and extraction on sloping terrain has always proved to be a world wide problem. It is, often associated with itrenuous work and / or possible damage to the environment. Vehicular movement is normally handicapped on slopes exceeding 30 %. Their maximum payload volume decreases 2.5% for every 1 % increase in the slope (Warkotsch, 1985). The introduction of chutes provides an acceptable alternative extraction method. One, of the first chute systems used in South Africa was the Leykam Logline, imported from Austria in 1986. General interest in chutes led to the development of several local versions, culminating in a coordinated project to determine the chute's applicability in South Africa. The initial technology transfer for the Leykam Logline was insufficient with the necessary knowledge to operate that chute correctly lacking. European working procedures and principles were applied to determine their applicability under South African conditions. It was found that although some changes, for example to the braking system, were needed, theseĀ· principles could be applied. Productivity during these trials averaged 0.8 to 1.2 m3/man hour. Despite drawbacks and initial teething problems, the chute represents a new dimension in modern harvesting technology in South Africa. It represents an important improvement in ergonomics when compared to the traditional hand-rolling method and it is a practical extraction aid. Finally and of great importance is the fact that the chute is an environmentally friendly extraction method.