. Mechanics of running skylines. Logging, Skyline. Unit No. Skyline Road No. DETERMINE FROM SKYLINE PROFILE Allowable loaded deflection Horizontal span length (one station = 100 feet) Slope of span OBTAIN COEFFICIENTS FROM "SKYLINE TENSION AND DEFLECTION HANDBOOK" Coefficient A (fig. 11 or table 2) Coefficient B (fig. 12 or table 3) Coefficient C (fig. 13 or table 4) Coefficient D (2 x coeff. B g,, 5^ - coeff. C 2Lft\ ) CARRIAGE WEIGHT (1 kip = 1,000 pounds) HAULBACK LINE ANALYSIS: Specifications: Diameter inches. Weight | « 04- pounds/foot Breaking strength 58 • a k
. Mechanics of running skylines. Logging, Skyline. Unit No. Skyline Road No. DETERMINE FROM SKYLINE PROFILE Allowable loaded deflection Horizontal span length (one station = 100 feet) Slope of span OBTAIN COEFFICIENTS FROM "SKYLINE TENSION AND DEFLECTION HANDBOOK" Coefficient A (fig. 11 or table 2) Coefficient B (fig. 12 or table 3) Coefficient C (fig. 13 or table 4) Coefficient D (2 x coeff. B g,, 5^ - coeff. C 2Lft\ ) CARRIAGE WEIGHT (1 kip = 1,000 pounds) HAULBACK LINE ANALYSIS: Specifications: Diameter inches. Weight | « 04- pounds/foot Breaking strength 58 • a kips, Factor of safety 3 Safe working load I C\ •& kips (or maximum yarder line pull) HAULBACK LINE CAPABILITY: Safe working load Subtract (coeff. A O. 11 <o x Q stations x j <Q^ pounds/foot) Remaining payload capability () Haulback gross capability = R-P-C. kips x 2 Coeff. C 2.^1 Subtract carriage weight Haulback line payload capability (If main and haulback are the same size, this is system capability) MAIN LINE ANALYSIS: Specifications: Diameter inches, Weight ( pounds/foot) Remaining payload capability () Main line gross capability = R-P-C \ Q-|4 klPs x 2 Coeff. D *\~l Subtract carriage weight Main line payload capability SYSTEM PAYLOAD CAPABILITY* *System payload is the lower of the main line or the haulback capability. Figure (2).-Running skyline worksheet (yarder at lower end). I I percent stations percent o-n £.g4. kip/kip 2.^1 kip/kip 7-. \~[ kip/kip Q,5 kips \^.<oO kips |.kips \%, 14- kiPs / 2,47 ups Q. SiQkips i I kips. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mann, Charles N. cn; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ). Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
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