This cleat was never meant to secure a boat on a swing
An example of a bridle mooring.
This line has jumped out of the fitting and is in danger
of being cut by the sharp stainless steel edge.
It is amazing how many owners will spend hours maintaining
their boat and then neglect one of the most important things - its
It seems only yesterday, but four years ago Club
Marine published an article about the importance of maintaining
a swing mooring.
The sight of a yacht that had parted from its mooring
during a storm and was washed ashore at Mornington in Melbourne,
prompted us to have another look at how people were maintaining
their moorings. The mooring itself was not the problem in this case,
the bow fitting had let go - we will look at that later in this
The months of August and September traditionally herald
strong southerly winds on most of Australia's waterways and it is
the time of the year when boats on swing moorings are at their most
vulnerable. Each year the southerly busters cause havoc in bays
open to the south. Four years ago high winds hit Sydney and thousands
of dollars worth of damage was done to boats moored in Manly Cove,
La Perouse, Kogarah Bay, Port Hacking and Botany Bay. And who can
forget that photograph of those six or seven boats washed up on
the beach at Little Manly that appeared in the Sydney newspapers.
There is no guarantee that it won't happen again this
Four years ago we took a trip around Rushcutters Bay
with marine assessor and salvage contractor, John Messenger. At
the time there were many owners tempting fate with the state of
their moorings. Many had badly chaffed ropes, in some cases inadequate
for the size of the boat, others had rusty chains and shackles -
a number almost worn through. Sadly nothing has changed. We still
found many examples of badly worn moorings. In some cases it looked
as if owners had moored their boats for the winter had left them
hoping that they would still be there for the summer season.
An example of a rounded bow fitting but the retaining pin
to stop the line jumping off the roller is missing.
This shows the pressure spot on the plastic sleeve, it is
also too big for the fitting.
This is a disaster waiting to happen.
Club Marine's files are full of sad tales of
boats that have been damaged, some wrecked beyond repair when they
have broken away from moorings and been smashed against other boats,
or driven against jetties and rock retaining walls.
There is the case of a 40-foot yacht that was moored
off Darling Point in Sydney Harbour. It broke free and drifted down
the harbour to Watson's Bay where it became jammed under a jetty.
A Randell 41 cruiser, worth in excess of $100,000 was attached to
a mooring the owner had put down himself, using chain that was too
small to take the weight of the boat. It broke free in a southerly
and was smashed on the rocks. The owner was left with part of the
bow and the keel section of the hull.
In another incident on Pittwater an Adams 31 broke
free in a storm and hit six other boats as it careered through the
moorings - causing more than $50,000 worth of damage.
Even if the mooring is well maintained there is still
no guarantee that it will hold your boat if it is in an exposed
John Messenger says the things that cause a boat to
break away from a mooring are chaffed rope, corroded chain links
and shackles, and poor swivels. "Years ago no-one would have considered
using rope to moor their boats, it was all chain," he said.
"In the days when bow fittings were manufactured from
bronze or gun metal there was no problem with chaffing. Now everything
is shiny stainless steel with sharp edges that cut through rope
like a knife."
He pointed out that another problem occurred when
people, in an effort to protect their deck, put a plastic sleeve
over the rope. The sleeve holds the rope in one spot and over time
it hardens, cracks and cuts through the rope. It is not easy to
replace the sleeve when an eye has been spliced into the end of
the rope, so it is left year after year until it chafes through.
|This owner is using a chain and
rope system but the weak link is the off-the-shelf shackle,
which is showing signs of corrosion.
|| A quick way to pull
the pulpit off.
In all cases the sleeve increases the diameter of
the rope to where it is too big to sit in the bow roller and the
retaining pin is left out. It was amazing just how many boats we
saw without pins or the rope was too big to push the pin home. As
the boat rises and falls in the swell it works out and can pull
the pulpit out or chafe on the toe rail.
Mooring lines should not be left attached to an anchor
winch. Some designs have a cast casing with a flimsy cleat on top.
This according to Messenger, just invites people to tie off to it.
He also laments the lack of fairleads on modern boats. If the boat
does not have fairleads the mooring line should be fixed to a bridle
that runs to two strong points on the boat.
The rope end is spliced through the last link of the chain.
A shackle is not used.
The components of a professional mooring showing the concrete
block, ground tackle and connecting chain.
A new swivel used by Polaris Marine to connect the ground
tackle to the chain rode and one after being in the water
for a few years.
Another don't is to splice a thimble into the eye
of the mooring line and to fix a chain to it with an off-the-shelf
galvanised shackle. After a time the thimble will elongate and cut
the rope. A galvanised shackle can't be relied on as well. If using
rope and chain, professionals splice the rope through the end link
of the chain.
For most people a boat is a big investment and the
small cost of a substantial mooring put down by a professional mooring
service is money well spent. Beware the person who offers to dive
on the mooring to check it. It is almost impossible to tell if it
is showing wear, especially in poor visibility and the silt on the
bottom of most popular mooring areas. To be checked properly the
mooring needs to be pulled at least once a year.
A professionally-built mooring, such as the type Polaris
Marine Constructions and Recovery in Sydney supply, consists of
a large concrete block that sinks into the mud on the bottom, a
length of stud link ground chain, a large swivel manufactured by
Polaris with the ends of the bolts cut off and peened over to stop
the nuts working loose, 24mm chain and 24mm rope spliced to the
end. Different areas, especially in Sydney require different treatment.
In some areas the chain will wear quicker than in others or there
may be an electrolysis problem that will quickly reduce the life
of a chain.
Polaris Marine's Adam Peeters showed us examples of
chain that had corroded over just one to two years to where the
links were half their original size and some off-the-shelf shackles
that had let go when the pins had corroded through.
And don't fall into the trap of hooking up to an existing
mooring that is not strong enough to take your boat. The mooring
may have been safe for a 25 footer but if you come along with a
35 footer it may not take the extra weight. Never moor your boat
on a strange mooring for any length of time without having it checked.
A professional mooring will cost around $1000 to put down and a
yearly inspection is about $90.
An off-the-shelf shackle after a couple of years in the water.
A 24mm connecting chain showing how corrosion and electrolysis
has worn it down from its original size and strength.
If the mooring is a private one it is your responsibility.
If your boat is on a commercial marina mooring it is the operators
responsibility to maintain it. It would pay to enquire of the operator
when and if your mooring had been serviced within the last 12 months.
Now back to bow fittings. The reason the yacht was
washed ashore at Mornington was because the bow fitting tore out
of the boat - the mooring remained intact. Just because your boat
comes with certain bow fittings don't take it for granted that the
fittings are suitable to secure a boat on a swing mooring.
Most bow fittings are manufactured overseas to a price
and many are totally unsuitable for securing a boat on a swing mooring
as you can see in some of the examples depicted in this story. Many
of these bow fittings have sharp edges or are too small to take
a regular 24mm rope. We found one boat hanging off the end of a
24mm rope that was attached to a cleat set back from the bow that
would be struggling to hold a 10mm line. Many boats are not equipped
to be kept on a swing mooring. If you are unsure as to whether the
fittings on your boat are adequate, seek professional advice from
a mooring contractor or a marina operator.
And if your boat is moored in a berth on a marina
don't become complacent and think it is entirely safe there either.
In strong winds the continual motion can cause mooring lines to
chafe and break. Boats in a berth should be secured at the bow and
stern with springs fore and aft made up to suit the boat and used
for that purpose only - don't expect an old sail sheet or a spare
bit of rope to do the job. In a blow it is always a good idea to
double-up the bow and stern lines.
The bottom line is don't use makeshift gear, such
as railway wheels or engine blocks with small chain and old rope
to secure your boat. Invest in a professional mooring and keep it
well maintained, because if you don't, you could well find that
your insurance policy does not cover the damage if your boat breaks
free from a sub-standard mooring.