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• 5 Layers: Power drops 42%
• 4 Layers: Power drops 32%
• 3 Layers: Power drops 19%
• 2 Layers:
• 1 Layers:
• 5 Layers: Power drops 42%
• 4 Layers: Power drops 32%
• 3 Layers: Power drops 19%
• 2 Layers:
• 1 Layers:
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3 Ways to Get the Most fr om Your Wi nch.
Physi cs of the Pul li ng Power Zone
TM
How t h e Law s o f Ph y s i cs g ov e r n w i n c h p er f or ma n c e.
We k n o w t h at u s i n g a l o n g - h a n d l ed w r e n c h m a k e s a j ob e a s i e r.
Yo u p u l l f u r t h e r a w a y f r o m t h e b o l t
_
a longer turning radius.
WHAT I F THE BOLT WAS DOI NG THE PULLI NG?
Then t he opposi t e i s t r ue. It ' s easi er f or t he bol t t o t ur n t he same
weight when it is closer to the bolt
_
a shorter turning radius.
Just like the drum on a winch.
As l ayer s of r op e bui l d u p, p ul l i ng t he same w ei ght r equ i r es g r eat er
force, robbing you winch of power. The first 2 layers of rope on the
drum we call the Pulling Power Zone. Beyond 2 layers, pulling
capacity can be reduced as much as 42%.
Ge t t h e mos t f r om you r w i nc h . E x t r a l a ye r s c u t pul l i ng p ow e r. St a y i n t he Pu l l i ng P ow e r Zon e .
Use p ul l e y bl oc k a n d d ou bl e t he c a p a c i t y of you r w i nc h .
Anot h er Law of Physi c s: doubl e t he l i ne w i t h a pu l l ey bl oc k an d y ou dou bl e t he p ul l i n g c ap ac i t y of you r w i n ch . Removi ng ex t r a r ope
from the drum also allows you to work in the Pulling Power Zone.
Ke e p t h e r op e f e e d i n g t hr ou gh t h e
fairlead as straight as possible.
Thi s wi l l hel p k eep t he r ope wr appi ng smoot hl y acr oss
the drum. Rope feeding through the fairlead at a sharp
angle will bunch up.
Some t ypi cal pul l s: a single line straight pull.
A r edi r ec t ed p ul l . If t her e' s n o st r ai gh t , c l ear
line to the anchor point, use a pulley block.
A t yp i c al d ou bl e- l i n e wi nc h and p ul l ey
arrangement doubles winch capacity.
1.
1.
2.
2.
3.
3.
St ar t eac h p ul l w i t h a mi n i mu m of
5 wraps* around
the drum.
Fr o m t h e m i n i m u m 5 w r a p s o f r o p e , t o t h e m a x i m u m
of 2 layers** on the drum, you
are working in the Pul li ng
Pow e r Zon e.
** Pulling capacity is
determined by the load
a winch can pul l wi th
only t he bottom layer
of rope on t he drum.
Fo r p r a c t i c a l p u r p o s e s ,
full capacity is retained
with up to 2 layers.
* The industry
safety standard.
The r ope f ast ener
alone cannot support
a heavy l oad.
The power l oss per cent ages above ar e appr oxi mat e.
The Pulling
Power Zone
TM
YES
Di ff i cul t
Di ff i cul t
Ea s y
Ea s y
NO
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