introduction cable yarding operations highlead live skyline running skyline demonstration contest
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INTRODUCTION CABLE YARDING OPERATIONS HIGHLEAD, LIVE SKYLINE, RUNNING SKYLINE DEMONSTRATION/CONTEST

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INTRODUCTION CABLE YARDING OPERATIONS HIGHLEAD, LIVE SKYLINE, RUNNING SKYLINE DEMONSTRATION/CONTEST. Cable Logging, Equipment & Systems. FOR 420 Feb 1, 2001 James Hart. CABLE YARDING.

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introduction cable yarding operations highlead live skyline running skyline demonstration contest

INTRODUCTION CABLE YARDING OPERATIONS HIGHLEAD, LIVE SKYLINE, RUNNING SKYLINE DEMONSTRATION/CONTEST

Cable Logging, Equipment & Systems

FOR 420Feb 1, 2001James Hart

cable yarding
CABLE YARDING
  • CABLE YARDING - MOVEMENT OF LOGS FROM STUMP SITE TO LANDING USING A MACHINE EQUIPPED WITH MULTIPLE DRUMS (OR WINCHES) OPERATED FROM STATIONALRY POSITIONS IN THE LANDINGS.
  • FIRST STEAM DONKEY (SMALL YARDER WITH A VERTICAL BOILER) WAS INVENTED ~1881 BY JOHN DOLBEER TO GROUND SKID LOGS IN OREGON
  • FIRST SKYLINE CABLE SYSTEM USED IN MICHIGAN ~ 1886 BY HORACE BUTTLER.
  • SYSTEMS STILL IN USE

OLD PNW YARDER

basic cable yarding system components
BASIC CABLE YARDING SYSTEM COMPONENTS
  • YARDER - TYPICALLY A RECTANGULAR FRAME BUILT FROM I BEAMS, WITH ENGINE AND DRUMS
  • TOWER, WITH GUY LINES
  • WIRE ROPE 6 STRANDS OF 19 WIRES EACH
    • MAIN LINE 1-1.25” -- HAULBACK LINE 3/4-7/8”
    • SKYLINE 1.5-2” -- OTHER MISC.
  • BLOCKS - PULLEYS
  • CKOKER - SHORT FLEXIBLE WIRE ROPE
  • BUTT RIGGING - COMBINATION OF CHAINLINKS, CLEVISES, AND SWIVELS CONNECTING
    • MAIN HAUL LINE
    • CHOKER OR GRAPPLE, AND
    • HAUL-BACK LINES
  • CARRAGE - COMBINATION OF PULLEYS, CABLE, ETC. THAT RIDE ON SKYLINE, ARE PULLED BY MAINLINE AND MAYBE A HAUL-BACK LINE, HAVE CHOKERS OR A GRAPPLE; AND PERHAPS A SLACKLINE
highlead system
HIGHLEAD SYSTEM
  • CLEARCUTS
  • CONSTANT SLOPES
  • 30-70% SLOPES, 1000’ DISTANCES
  • UPHILL YARDING
  • 2 DRUM YARDERS
  • DRUM -- MAINLINE -- BUTT RIGGING (with CHOKERS/GRAPPLE) -- HAUL-BACK LINE (with BLOCKS) -- DRUM
  • 20 LOGS/DAY
highlead system cont
HIGHLEAD SYSTEM [CONT]

SKAGIT 3-DRUM PORTABLE TOWER

WITH GUY LINES

CABLE LOGGED CORRIDOR IN PNW

live skyline system
LIVE SKYLINE SYSTEM
  • SKYLINE LIFTS LOGS
  • LIVE SKYLINE MOVES UP/DOWN TO GET CARRAGE TO LOGS
  • 2-DRUM YARDER IS ELEVATED, USES GRAVITY AND NO HAUL-BACK LINE
  • 30-90% SLOPES, 500-4000’
  • DRUM -- SKYLINE --ANCHOR (or TAIL-SPAR TOWER)
  • DRUM -- MAINLINE -- CARRAGE (with CHOKERS OR GRAPPLE)
  • ELEVATED OPERATION
    • ALLOWS PARTIAL CUTS
    • DECREASES DISTURBANCE
  • 470 LOGS/DAY
running skyline system
RUNNING SKYLINE SYSTEM
  • 3rd DRUM FOR HAULBACK LINE
  • DRUM -- SKYLINE --ANCHOR (or TAIL-SPAR TOWER)
  • DRUM -- MAINLINE -- CARRAGE (with CHOKERS OR GRAPPLE) - HAUL-BACK - DRUM
  • ELEVATED SKYLINE
    • ALLOWS PARTIAL CUTS
    • DECREASES DISTURBANCE
  • UPHILL OPERATION
  • 4th-DRUM CAN ADD SLACK-PULLER TO LOWER/RAISE CABLE AND KEEP SKYLINE STATIC
  • 30-90% SLOPES, 500-4000’

SLACK-PULLER CARRAGE

cable logging systems advantages disadvantages
can yard logs over ground on which tractors cannot operate

Running skylines operate in any direction

up-slope

down-slope

operate in any weather

less damaging to soil than tractor skidding

operates faster than tractor on same terrain

limited primarily by the line capacities of the yarder drums

the high-lead is used for only clear-cut

the cost of moving, and changing yarding road are fixed, not efficient for low volumes of harvesting

High costs per unit for low values per acre discriminates against small log operations

CABLE LOGGING SYSTEMS------------------------------------------ ADVANTAGES DISADVANTAGES
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