All chain vs half and half
Tom,
I am not talking about light airs where any anchor system will work BTW
nylon line does not float. My concern is storms where the forces generated
are near the ultimate strength of the chain. Nylon line can stretch long
enough to distribute the load where a chain will snap. BTW 3/8 BBB is
significantly weaker than G4 not to mention G7. Also most experts are in
favor of multiple anchor aboard.
You would do well to read wikipedia on the nature of catenaries. At full
load a chain has no elasticity. This message was brought to you courtesy
not of me but Isaac Newton.
I welcome any non-anectdotal responses to the contrary.
PHD
Another point to make is the line described in the original post would
provide no catenary since it "almost floats". So, it would have no
elasticity and no catenary... a semi floating glob perhaps... and jarring
when setting the hook. Doesn't sound too great for anchoring...
-Matt
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Chain is heavy, and many boats like mine don't want all that extra weight
in the bow. And chain has no stretch, not a good feature in ground tackle.
We use a 45# Rocna, 50' of 5/16 HT chain and 250' of nylon (it doesn't
"almost float"), for our 36' trawler. If your anchor rode floats, you have
the wrong anchor rode.
One advantage of this system is that we don't have to deal with a snubber.
We let out more than 50', wrap the nylon rode around the samson post and
have some sort of a beverage. It's also easy to gather up in the morning.
In serious weather we will probably use more rode than if we were all
chain. In serious weather we swing around the same as if we were all chain,
and are not any more likely to bang into other boats.
One disadvantage is that we anchor so ofter that we wear out that rope to
chain splice, and it has to be redone. And the line doesn't last as long as
chain.
Jeff Janacek on Adirondack
currently at Hidden Harbor Marina in Brunswick, GA
To some extent, the discussion of breaking strength of chain in many of
these discussions seems to me to ignore one other issue, namely that of
the breaking point of what it is attached to. For example, here are the
specs of one 3/8 chain from one vendor:
3/8" Grade 43 (G4) Chain, Inside Link Length: 1.220", MWL: 5400lb.,
Breaking Strength: 16200lb., Weight: 1.49lb./ft., Standard Pack: 200'
I very much wonder if any of us have an attach point on our boat that
would come anywhere near to remaining intact while breaking the chain.
I suspect on my boat that long before the 16,200 lb pull was achieved
that the attach point would long since have failed, so breaking the
chain is not a very material consideration.
KB
50' Marine Trader
Hi Jeff.
Your system is very similar to what I have settled on. 45' 5/16 G4.150'
double braid with terminal eye to bend on extra line.
Rocna 35#, SuperMax 35#, each on pivoting bow rollers, 45 Mantus in
reserve.
The purpose of chain is to load the anchor horizontally, not to provide an
inelastic catenary, which in storm conditions acts like a solid bar of
steel.
Oh yea soft shackles.
Peter Denton
Resolute
On the Hard
Washintgon NC
On Tue, Jun 14, 2016 at 9:34 AM, Tamaroak via Trawlers-and-Trawlering <
trawlers@lists.trawlering.com> wrote:
Chain is heavy, and many boats like mine don't want all that extra weight
in the bow. And chain has no stretch, not a good feature in ground tackle.
We use a 45# Rocna, 50' of 5/16 HT chain and 250' of nylon (it doesn't
"almost float"), for our 36' trawler. If your anchor rode floats, you have
the wrong anchor rode.
One advantage of this system is that we don't have to deal with a snubber.
We let out more than 50', wrap the nylon rode around the samson post and
have some sort of a beverage. It's also easy to gather up in the morning.
In serious weather we will probably use more rode than if we were all
chain. In serious weather we swing around the same as if we were all chain,
and are not any more likely to bang into other boats.
One disadvantage is that we anchor so ofter that we wear out that rope to
chain splice, and it has to be redone. And the line doesn't last as long as
chain.
Jeff Janacek on Adirondack
currently at Hidden Harbor Marina in Brunswick, GA
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Many cleats, chain stoppers are not close enough to the deck.The rode
should be deployed as close to the deck as possible so that the load is in
shear with as little bending moment as possible. This especially a problem
with Sampson posts. The shear strength of 4, 1/2 inch bolts far exceeds
that of most chain we use, if it doesn't use 3/4 bolts where the shear
strength is well over 100,000#.
Peter denton
On Tue, Jun 14, 2016 at 10:24 AM, Ken Bloomfield via
Trawlers-and-Trawlering trawlers@lists.trawlering.com wrote:
To some extent, the discussion of breaking strength of chain in many of
these discussions seems to me to ignore one other issue, namely that of the
breaking point of what it is attached to. For example, here are the specs
of one 3/8 chain from one vendor:
3/8" Grade 43 (G4) Chain, Inside Link Length: 1.220", MWL: 5400lb.,
Breaking Strength: 16200lb., Weight: 1.49lb./ft., Standard Pack: 200'
I very much wonder if any of us have an attach point on our boat that
would come anywhere near to remaining intact while breaking the chain. I
suspect on my boat that long before the 16,200 lb pull was achieved that
the attach point would long since have failed, so breaking the chain is not
a very material consideration.
KB
50' Marine Trader
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Combination of three strand and or 8 plait Yale brait nylon anchor rode is a good one if windlass are comparable, however makes it difficult to reduce the scope to the waterline and force on pulpit. I've had great success with my all chain rodes, both 300'(one 3/4" G-4 HT other 5/16" G-4 HT) with Yale 8 plait brait (said by Yale to be stronger than 3 strand nylon and stretch more while retaining strength). Attached to a very stout through stem(6" solid glass with baking plate) mounted 3/4" stainless steel polished towing eye at the water line. This towing eye functionally reduces my scope from on deck(6+' above water level) to water level. My snubbers are very over sized(5/8"X 24' for 5/16" chain) and 3/4" X42' for 3/4") to compensate for strength reduction when wet and aging/use deterioration. A better design is to route the snubber thru the large(diameter to reduce chafe) water level eye(mounted horizontally not vertically as mine is) to facilitate feeding more snubber out to increase or decrease scope vice swing and weather. This system works great when in a tight shallow anchorage but still needing a good scope ratio for weather. The towing eye is strong than
Joe Pica
M/V Carolyn Ann GH N-37
http://carolynann-n37.blogspot.com/
MTOA#3813, AGLCA #5485 Platinum
Why would you want to avoid a snubber? It removes the chance of chafing of
your much longer and more expensive main rode.
Rich Gano
FROLIC 2005 Mainship 30 Pilot II
Panama City, FL
We use a 45# Rocna, 50' of 5/16 HT chain and 250' of nylon (it doesn't
"almost
float"), for our 36' trawler. If your anchor rode floats, you have the
wrong
anchor rode.
One advantage of this system is that we don't have to deal with a snubber.