MULTIPLE LINE PULLS
THE need for multiple line pulls should be apparent, but the actual mechanics of it are rather impressive. Instead of hooking your winch line directly to the tree trunk protector, as you would in a normal recovery, you run the line out through a pulley block attached to the tree trunk protector and then back to your four-wheel drive’s recovery point with a damper over both lines. This halves recovery speed and doubles the pulling power of the winch, giving a 12,000lb winch 24,000lb of pulling force – that’s close to 11 metric tonnes.
Next, add an additional pulley block to the vehicle’s recovery point, run the winch line to a second tree with a tree trunk protector, and add another winch damper, to triple the pulling power of the winch.
This provides a pulling force of
36,000lb, although it will also cut the speed of the recovery by one third.
It’s important to note a winch’s pulling power is rated with just one layer of rope on the drum. It loses roughly 12 per cent pulling power for each additional layer of rope on the drum. Performing a double, or even triple, line pull can help get more rope off the drum and give you more chance of getting free.
By running the winch line back to the vehicle through a pulley block, we’re halving the effective speed of the winch and doubling its pulling power.
Due to the energy stored in the rope and cable, a damper (or winch blanket) is required for each individual line. Heavy clothing or car seat covers can work in a pinch.
Pulley blocks don’t require a 180-degree turn and can be used to winch around corners, or even to recover a vehicle behind you if you’re unable to turn around.