• Hathaway, Frederick M.
  University of Maine Graduate School
  

This study evaluated three 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 two low-powered winches on sleds were used. One single-drum system was run by professional wood workers, and the others were operated by forestry students. Three different types of chokers were used in the study and a skid cone was used in three of the systems. The professional woodsmen used a self-release block at the back of the trailside pile to avoid hangups with the turn, while the other four systems used a spar tree.