Abstract
ABSTRACT The field performance of accumulating feller-bunchers reported in the United States and Canadian literature is reviewed. The major variables affecting feller-buncher performance in trees per productive machine hour (TPPMH) are average stand tree diameter at breast height (DBH), initial stand trees/ha (TPHA), and trees per accumulation (TPACC). The correlation between these variables is used to determine TPPMH as a linear function of DBH only. Slopes ranged from -6 to -25 TPPMH/DBH (trees/cm/h) for the feller-bunchers considered. Accumulating feller-bunchers should be considered for use in stands with DBH = 15 to 30 cm and shear or saw diameter should be two to three times DBH.
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