Cable Logging Production Rate Equations for Thinning Young Growth Douglas-Fir

A cable logging thinning simulation model and field study data from cable thinning production studies have been assembled and converted into a set of simple equations. These equations can be used to estimate the hourly production rates of various cable thinning machines operating in the mountainous terrain of western Oregon and western Washington. The equations include seven small-and medium-sized cable yarders and are applicable to uphill thinnings of Douglas-fir from low to high volume removals. Hourly production rates can be easily calculated on a hand calculator using log size, volume removed per acre, and average yarding distance as inputs. The equations can be used to develop reasonable approximations of delay-free hourly production for several cable yarders operating in thinnings, under a variety of site and stand conditions.

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