. Economics and design of a radio-controlled skyline yarding system. Logging, Skyline. The Skagit Model RCC-20 Skycar, which rides on the main skyline, incorporates a 95-horse- power GMC Model 4-53 diesel engine driving through a twin disc, three-stage, dynamic breaking torque converter. Power is transmitted from the torque converter to the drum set through a propeller shaft. The reversible, load- line drum is engaged by air-operated multiple clutches. The RCC-20 Skycar is suspended from the skyline by an open-side carriage,- , the Skycar is permitted to travel past support jacks, which su
. Economics and design of a radio-controlled skyline yarding system. Logging, Skyline. The Skagit Model RCC-20 Skycar, which rides on the main skyline, incorporates a 95-horse- power GMC Model 4-53 diesel engine driving through a twin disc, three-stage, dynamic breaking torque converter. Power is transmitted from the torque converter to the drum set through a propeller shaft. The reversible, load- line drum is engaged by air-operated multiple clutches. The RCC-20 Skycar is suspended from the skyline by an open-side carriage,- , the Skycar is permitted to travel past support jacks, which suspend the main skyline at inter- mediate points. The Skycar suspension system has four sheaves, 36 inches in diameter, which ride on the main skyline. Suspension from the four sheaves is by a patented swivel system which allows the Skycar to remain in a relatively per- pendicular position while yarding laterally to the skyline. The diesel engine runs at idle speed until accelerated by radio impulse, when the skidding drum is engaged for paying out line or for skidding the turn to the carriage. The skidding drum has a capacity of 400 feet of 7/8-inch-di- ameter wire rope, which permits lateral skidding of approximately 300 feet. The no-load speed for paying out slack is 400 feet per minute,- for paying in, it is 319 feet per minute, with a stall pull of 40,000 pounds. Line speeds and pulls are based on average drum conditions. The designed weight-carrying capacity of the Skycar is 40,000 pounds. Gross weight of the RCC-20, including wire rope, fuel, and water, is 8,140 ; Snubbing Machine The snubbing machine has three drums. One holds 4,400 feet of 1-inch snubbing line,- an- other, 5,700 feet of 3 haulback line (used for rigging intermediate support spars and for tensioning the skyline),- and the third, 5,000 feet of 7/ 16-inch straw line. The snubbing machine is equipped with a hydrotarder which is used to brake the speed of the loaded car- riage down the sk
Size: 1396px × 1790px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
