| Usually made up of
one single and one
double block, it can be set up with two double blocks.
Whether you have hook or tail on each end is a matter of preference, I have mine set up with snap shackles. Having one set up ready to go means it will save time in any emergency situation. |
The
obvious use is to gain
mechanical advantage when lifting heavy objects.
It can also be used to take the strain off another line.
With a rope tail on the block tied to a line with a rolling hitch, strain on the line can be eased in order to,
Untie a knot,
Release a riding turn on a winch
Or just to help haul the line.
The mechanical advantage gained from using a block and tackle is, in theory a multiple of the number of falls.
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Also the length of rope needed
to move the load a certain distance will be increased by the number of
falls.
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