Jarrett F10206 - Page 10

2 Speed Boat Trailer Winch Owner’s Manual 9
Winches are not intended (1) for the movement of people and (2) as a load securing device for boats on trailers
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Rolling Load Capacity of a Winch
Max. rated
Rolling Load Capacity Multiply
incline % incline Degrees winch
capacity by
To calculate the rolling load capacity of a winch - the amount of load that can be
pulled up an incline - multiply the winch capacity by the factor shown in the chart
below. The multiplication factor shown includes a 10% rolling friction factor. 10:10 100
45
0
00
'
1.29
Note: 5% incline is 1/2 metre rise in 10 metres.
9:10 90
42
0
00
'
8:10 80
38
0
40'
7:10 70
35
0
00'
1.53
6:10 60
30
0
58'
5:10 50
26
0
34'
1.86
4:10 40
21
0
48'
3:10 30
16
0
42'
2.61
2:10 20
11
0
19'
3.40
1:10 10
5
0
43'
5.02
0.5:10 5
2
0
55'
6.67
0:00 0 = level 10.00
Angle / incline - not to scale
A commonly used ratio of boat size to winch capacity is 2 to 1. However, the ratio can be stretched to 3 to 1 using a trailer in
excellent condition.
A guide to the rolling load (pulling) capacity of a winch (in excellent condition) pulling a boat onto a trailer equipped with fitted keel
rollers and side wobbles (in good condition) is as per the following table. For example, a 300kg winch can pull a 900kg boat onto a
trailer (equipped with fitted keel rollers and side wobbles) with a 10 degree incline (i.e. 20% incline).
The ratio should be reduced to 1 to 1 on trailers with wooden bunks and no self-alignment capabilities.
Rated capacity of the winch
% incline
of trailer 200kg 300kg 500kg 700kg 800kg 1000kg
0 2000 3000 5000 7000 8000 10000
5 1300 2000 3300 4600 5300 6600
10 1000 1500 2500 3500 4000 5000
20 650 1000 1700 2350 2700 3300
30 500 750 1250 1750 1900 2500
50 350 550 900 1300 1450 1850
70 300 450 750 1000 1200 1500
100 250 350 600 850 1000 1250
Max. Rolling Load (Pulling) capacity of winch (kg) with a trailer in excellent condition