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General Winch Selection
Because the high forces generated when using a winch create potential safety hazards, careful consideration should be given the winch selection process.
When selecting a winch you need to consider the gross vehicle weight and winch’s line pull.
Gross vehicle weight contains your vehicle’s curb weight and the weight of the supplies and equipments carried.Generally speaking, you need a winch with a maximum line pull of at least 1.5 times greater than the gross vehicle weight
Rolling Pull
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 wheels on the surface.
How steep is the slope or ramp? To determine the grade of the incline, measure the height and the length of the ramp.
Height / Length = % Grade
Our common surface resistance are as below:
|
Friction Factor/Surface resistance |
|
Sand |
0,18 |
Gravel |
0,20 |
|
Mud |
0,32 |
Marsh |
0,52 |
|
Loose sand |
0,22 |
Metal |
0,15 |
Maximum Rolling Pull=Maximum Line Pulling/(G+F)
G=Gradient Factor F=Friction Factor
Example how to calculate the maximum Rolling Pull of 4 tons pulling winch for a loose sand with a 70% gradient.
|
Gradient |
5% |
10% |
20% |
30% |
50% |
70% |
100% |
|
Angle |
3 |
6 |
11 |
17 |
26 |
35 |
45 |
|
G.vaiue |
0,06 |
0,11 |
0,2 |
0,3 |
0,44 |
0,58 |
0,71 |
Vinches For Vehicles(车型-绞盘速查表)
|
|
12500lbs |
12000lbs |
10000lbs |
9500lbs |
9000lbs |
8500lbs |
8000lbs |
6000lbs |
|
Land Cruiser100 |
B |
A |
A |
A |
A |
|
|
|
|
Land Cuiser90 prado |
|
B |
B |
B |
B |
A |
A |
|
|
Land Cruiser70(long) |
|
B |
B |
A |
A |
A |
A |
|
|
Safari(long) |
|
B |
B |
A |
A |
A |
A |
|
|
Terrano |
|
|
|
|
|
A |
A |
B |
|
Datsun |
|
|
|
|
|
B |
B |
A |
|
Pajero(long) |
|
|
|
B |
B |
A |
A |
|
|
Challenger |
|
|
|
|
|
A |
A |
B |
|
Paijero(io) |
|
|
|
|
|
A |
A |
A |
|
Bighom |
|
|
|
B |
B |
A |
A |
|
|
Rodeo |
|
|
|
|
|
A |
A |
B |
|
Grand Cherokee |
|
|
|
|
|
A |
A |
B |
|
Cherokee |
|
|
|
|
|
A |
A |
B |
|
Wrangler |
|
|
|
|
|
A |
A |
B |
|
Explorer |
|
B |
B |
A |
A |
A |
A |
|
|
F150 |
|
B |
B |
A |
A |
A |
A |
|
|
Blazer |
|
B |
B |
B |
B |
A |
A |
|
|
Hummer |
A |
B |
B |
|
|
|
|
|
|
Range Rover |
|
B |
B |
A |
A |
A |
A |
|
|
Discovery |
|
B |
B |
A |
A |
A |
A |
|
|
Mercedes G class(long) |
|
B |
B |
A |
A |
A |
A |
|
|
Mercedes M Class |
|
|
|
|
|
|
A |
B |
A=The First Choice B=The Second Choice
车型-绞盘速查表是以各款汽车的说明书载明质量为基数的，最终影响绞盘选择的因素还包括汽车配重/装备/和乘员重量、对越野目的地地质结构和载荷系数的评估。因此我们认为，作为越野设备或者救援车辆，尽可能选择拉力更大的绞盘。
     
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