'MIICROFICHE REFERENCE LIBRARY - Cd3wd.com

6.00 - 6.016.00 WINCHES AND TOWINGSo many recovery processes use a winch, or towing by another vehicle,that the two have been grouped in this section. In addition, suggestionsfor towing a trailer are also included.The basic tool for all of these operations is the tcw rope, whichmay be a fiber rope, wire cable or chain, or any conibination of these three.6.01 W&RopeThe rrostconnmn formoftow cable orwinch cable is the wire rope.The basic advantage of this material over fiber rope such as manila is itsgreatstrength. In comparison to chain, wire rope offers lighter weightforthe same strength. The following table illustrates the breaking strengthof several common sizes of uncoated fiber core plow steel rope. (Galvanizedcable is about 90 per cent of this strength.)1Iomina l&meterib?eaking Seeil~llJ4 inch ( 6.25 mm.)S/16 inch3/8 inch : .:.5 iit-:7A.6 inch (11 n-m-l:>l/2 inch (12.5 mm.)9/16 inch (14.25 mm.>5/8 inch (16 nun.>3/4 inch (19 mn.17/8 inch (22.25 mm.)1 inch (25.5 mm.>5,660 pounds8,780 pounds12,300 pounds16,400 pcunds21,100 pounds26,300 pounds32,400 pounds46,200 pounds62,800 pounds81,900 pounds( 2,570 Kg.1( 3,980 Kg.>( 5,580 Kg.1(, 7,440 Kg.1( 9,570 Kg.)CL,930 Kg.)(14,700 Kg.)(20,950 Kg.)(28,490 Kg.)(37,150 Kg.)It is evident from examina tion of this chart that even with relativelysmall cable the weight which can be supported will be in excess of the wei@of the car. There is, therefore, no advantage to using very heavy wire ,tiAein most cases. It is very difficult to work with, since it is hard to bendand join, and it is very heavy.6.02 Joining Wire CableThe grxatest disadvantage of wire cable is the difficulty of joiningone section to another. With fiber rage, this is easily done with a knot,but if a wire rope is knotted the strands will be kinked and weakened. Oftenalu?otcannotberxovedfromwire rope if ithasbeen strained. Also,aknot will jam in a winch mechanism and will keep the cable from lying flat. -The inability to use ordinary knots inwire rope neednotbe ahandicapif the cables are prepared in advance. Every piece of cable should haveeither a hook or a loop on each end, never just a straight end.HOOKS can be placed in wire rope for the greatest ease of attaching toanother length of cable or to a car or trze. Thehooks areavailablewithholes through which the cable is passed. The cable is then joined as describedin succeeding paragraphs.