Abstract
Optimizing layout method for mobil tower yarder was studied in a clear-cut logging operation. A time-study analysis of large size mobil tower yarder was used to estimate both the machine productivity and operating cost. Analysis indicates that optimizing method using neural network model can be used to improve productivity of tower yarder system. Further result suggest that system productivity of clear cut aerea is highest when operation site is constructed in small blocks, average 100 to 150m main line cable distance. Result indicates that enlargement of mobile tower yarder system sometime cause decrease of productivity, so large size mobile tower yarder must be only using as an alternate system in private forestry in Japan which has low forest road density.
