. A computer program for determining the load-carrying capability of the running skyline. Log transportation Data processing; Logging, Skyline. INTRODUCTION The running skyline is a cable sys- tem widely used for logging in the timber harvesting industry. It is a system of two or more suspended, moving lines, generally referred to as a main and haul- back, that, when properly tensioned, will provide lift and travel to the carriage. The basic system is illustrated in figure 1. A logging system designer must know what payload a logging system can carryover a given ground profile. Recog- nizing t
. A computer program for determining the load-carrying capability of the running skyline. Log transportation Data processing; Logging, Skyline. INTRODUCTION The running skyline is a cable sys- tem widely used for logging in the timber harvesting industry. It is a system of two or more suspended, moving lines, generally referred to as a main and haul- back, that, when properly tensioned, will provide lift and travel to the carriage. The basic system is illustrated in figure 1. A logging system designer must know what payload a logging system can carryover a given ground profile. Recog- nizing this requirement, Manni/ presented a procedure for determining the load- carrying capability of the running skyline and discussed the mechanics of some of the system's configurations. Mann's 2/ Charles N. Mann. Mechanics of running sky- lines. USDA For. Serv. Res. Pap. PNW-75, lip., illus., 1969. Pac. Northwest For. & Range Exp. Stn., Portland, Oreg. procedure was an extension of the graphical-tabular method discussed in the "Skyline Tension and Deflection Handbook. "1/ Mann's procedure provides a straightforward approach to determina- tion of payload capability of the running skyline at midspan. Unfortunately, the method can be time-consuming, generally proceeding at a rate of 10 to 20 payload determinations per man-day. This rate may not be acceptable when a large num- ber of skyline roads are to be designed. A more efficient approach employs a desk-top computer/plotter. — / However, —f Hilton H. Lysons and Charles N. Mann. Sky- line tension and deflection handbook. USDA For. Serv. Res. Pap. PNW-39, 41 p., illus., 1967. Pac. North- west For. & Range Exp. Stn., Portland, Oreg. 1/Ward W. Carson, Donald D. Studier, and Hilton H. Lysons. Running skyline design with desk- top computer /plotter. USDA For. Serv. Res. Note PNW-153, 21 p., illus., 1971. Pac. Northwest For. & Range Exp. Stn., Portland, Oreg. Spar 1. Figure 1.—Running Please note tha
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