1.
Twisted
ropes:
Twisted
ropes
are
only
rare
used
for
halyards
and
sheet
in
the
pleasure
boat
market.
The
benefits
of
braided
ropes
are
in
most
cases
better
than
twisted.
The
main
use
of
that
ropes
are
as
mooring
lines
because
of
the
better
elongation
or
for
traditional
use
because
of
nostalgic
reasons.
Benefits
of
twisted
ropes:
2.
Braided
ropes:
Nearly
all
halyards
and
sheets
are
braided.
Most
of
the
ropes
are
cover-core
constructions.
Sometimes
hollow
braided
ropes
are
used
as
well.
The
cover
is
from
8 up
to
32
braided
at
FSE-Robline.
The
higher
the
braiding
figure
is
the
better
is
the
abrasion
resistance
through
a
smoother
cover.
But
you
loose
firmness
through
a
higher
number
of
yarns.
The
splicing
ability
is
at
most
braided
ropes
very
good.
The
benefits
of
braided
ropes
are:
- Core and cover takes the load
- Higher strength
- No twist of braided ropes (easier for handling)
- Basically braided ropes have a lower abrasion resistance than twisted. Because only the cover is responsible for the abrasion and it is only 50% of the material. FSE-Robline additionally twists all the single yarns at braided ropes and therefore the abrasion resistance is better.
- Polyester ropes: the cover takes similar load than the core.
- High Tech ropes (Dyneema/Spectra, Vectran,…): the core takes the weight and the cover is only for abrasion resistance and for UV-stability.
- The cover takes the load e.g. through cleats and transfers it to the core.
At high tech ropes an intermediate core is necessary because Dyneema/Spectra is a very smooth material. With this cover made of spun yarns an optimised adhesion between both materials is enabled.
With this construction is e.g. Admiral Racing free from core-cover-adjustments.
3.
Possible
constructions
for
braided
cores:
- Parallel core: rope with parallel yarns (without twist). The rope has higher breaking strength and lower elongation but it is very hard to splice.
- Twisted core: This construction is very hard to splice. It is a very old construction and no longer used from FSE-Robline.
- Braided core: This is the most common construction for yachting ropes. The core is 8 or 12 braided for a better splicing ability. Lower stretch and higher breaking load are possible.
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