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TRAILER WINCHING TIPS                           

Maximum Line Pull

This is the maximum dead-weight the winch could lift off the ground with a single line on the first layer of wire rope on the drum.

Rolling Pull

The maximum weight (on wheels) that the winch can pull up a slope of a particular gradient and surface resistance. The rolling pull varies with gradient and the resistance of the wheel on the surface.

Maximum Rolling Pull  =

     Maximum Line Pull       (G) + (F)
G = Gradient Factor F = Friction Factor
Friction Factor
Sand 0.18 Gravel 0.20
Mud 0.32 Marsh 0.52
Soft Sand 0.22 Metal 0.15
Therefore, to calculate the maximum rolling load of a 9,000 lb line pull winch for a gravel road with a 20% gradient:                                       Max rolling pull    =   9,000lb/(0.2 + 0.2) = 22,500 lb

Gradient Factor

Gradient 5% 10% 20% 30% 50% 70% 100%
Angle 3 6 11 17 26 35 45
Value of G 0.06 0.11 0.2 0.3 0.44 0.58 0.71

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