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This study evaluated two single-drum and two double-drum winching systems for prebunching small-diameter, tree-length stems from partial cuts. Three farm tractors with Farmi winches and one sled-mounted winch were used. One single-drum system was run by professional woods workers and the others were operated by forestry students. Three different types of chokers were used and a skid cone was used with two systems.
The professional crew used a self-release block at the back of the trailside pile to avoid piling delays while the other systems used a spar tree. All systems were evaluated by time studies. The professional crew was the most efficient due to the use of the self-release block at the back of the pile, low setup time, fewer delays and high motivation. There was no significant advantage to using the skid cone nor were there significant differences among chokers.
Maine Agricultural and Forest Experiment Station
bunching machine, forest harvest practices, prebunching small-diameter trees
Hathaway, Frederick M. and Hoffman, Benjamin F.. 1986. B815: A Comparison of Small Single- and Double-Drum Cable Systems for Prebunching Partial Cuts. Maine Agricultural and Forest Experiment Station Bulletins 815.