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Old 07-10-2011, 07:54 PM
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Default Anchor chain. How much??

Hey guys
I have a 21 ft walkaround havin tough time holdin anchor it's a fluke. Danforth anchor with about 3 to 4 ft of chain ( how I bought it) Lookin to anchor up in shallow coves but need it to hold of course. Muddy sandy bottom would more chain help? Or am I doin something wrong? any advice would be great Thanks
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Old 07-10-2011, 08:20 PM
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Most people say somewhere in the neighborhood of a boat legnth of chain is good so yeah you could try some more chain.
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Old 07-10-2011, 08:31 PM
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21 ft of chain?! Really?
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Old 07-10-2011, 08:33 PM
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Absolutely....boat length.....
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Old 07-10-2011, 08:53 PM
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10' is plenty for what you're doing
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Old 07-10-2011, 09:00 PM
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What is the purpose of the chain?
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Old 07-10-2011, 09:08 PM
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Its hard to have too much chain but I think a half a boat length will do.

Chain does a lot of things but, most importantly, it keeps your anchor from getting disturbed by every wave. The anchor lays on the bottom and secures the rode horizontally. It's not simply a weight that keeps the boat from moving. As the boat rides up and down over the waves while anchored, the chain moves up and down to compensate for the boat's movement. In a perfect anchoring situation, the anchor never moves.
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Old 07-10-2011, 10:21 PM
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21' is a little much, I would shoot for around 10'... In a shallow cove I wouldn't expect to see a ton of wave action, the only thing I would worry about is wind a tide pulling the anchor loose.
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Old 07-10-2011, 10:28 PM
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Yeah 10ft of 3/8 will do....make sure you tie the shackle pin with SS wire...
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Old 07-10-2011, 10:30 PM
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You're not living on the hook, just authoring for a little while. 10-15' should be plenty. If its that rough, I'd imagine you're weighing anchor and moving anyway.

I use 250' of all chain with a 110lb Danforth, but I'm on the hook a lot and overnight quite often. Different situation.
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Old 07-10-2011, 10:31 PM
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You're not living on the hook, just anchoring for a little while. 10-15' should be plenty. If its that rough, I'd imagine you're weighing anchor and moving anyway.

I use 250' of all chain with a 110lb Danforth, but I'm on the hook a lot and overnight quite often. Different situation.
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Old 07-11-2011, 03:59 AM
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going by Chapman half the length of your boat of chain
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Old 07-11-2011, 04:26 AM
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Quote:
Originally Posted by HDRyder999 View Post
Its hard to have too much chain but I think a half a boat length will do.

Chain does a lot of things but, most importantly, it keeps your anchor from getting disturbed by every wave. The anchor lays on the bottom and secures the rode horizontally. It's not simply a weight that keeps the boat from moving. As the boat rides up and down over the waves while anchored, the chain moves up and down to compensate for the boat's movement. In a perfect anchoring situation, the anchor never moves.
That's a very good post.

A boat length of chain is what the people who know about these things recommend.

It's alo important to use enough scope and know how to set the anchor properly.
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Old 07-11-2011, 06:25 AM
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If you are having a problem staying anchored, yes more chain will help. But scope may be your primary problem. 5:1 is the minimum recommended scope and 7:1 is desirable. If you are in 10 feet of water, this means having a minimum of 50 feet of combined chain and rode out. Do the math. 20 foot depth equals 100 feet.

So often I see boaters trying to use only 20 feet of scope in 10 feet of water and they can't figure out why their anchor won't hold.
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Old 07-11-2011, 06:31 AM
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Quote:
Originally Posted by jcwiza View Post
If you are having a problem staying anchored, yes more chain will help. But scope may be your primary problem. 5:1 is the minimum recommended scope and 7:1 is desirable. If you are in 10 feet of water, this means having a minimum of 50 feet of combined chain and rode out. Do the math. 20 foot depth equals 100 feet.

So often I see boaters trying to use only 20 feet of scope in 10 feet of water and they can't figure out why their anchor won't hold.
Correct except that the measurement is not just the depth of the water, but the depth of the water plus the distance form the water's surface to the point where the rode leaves the boat. In ten feet of water with the pulpit three feet above the surface, the calculation would be based on thirteen feet and the recommended rode would be sixty five feet.
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Old 07-11-2011, 06:34 AM
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my friend has a 46 viking and he uses 75 feet of chain overkill yeah but boat never moves just a little food for thought.
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Old 07-11-2011, 11:26 AM
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I have a 22 cc and use 12' of chain. No problems and seldom anchor over 100' depth.
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Old 07-11-2011, 11:59 AM
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More chain is always better.....your boat length is a good rule of thumb for boats that anchor out overnight a lot, but for your basic daytripping lunch hook type anchoring 8 or 10 feet is probably fine.
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Old 07-11-2011, 01:28 PM
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I think this question has some possible hurdles. First, some types of chain are heavier than others. Also, if u don't have a windlass u need to lift that chain yourself. I tailor my chain and anchor based on my needs and I know the limitations of what I have. If u are exhausted or hurt your back from lifting that chain and anchor, you probably wont do it again. Just like everything in boating u have compromises. If u want to go by the book, then it's been answered.

I have a 30+ ft cc with 8ft of SS light chain and the biggest Fortress anchor they make and I know what conditions I can anchor in. I can lift that chain and anchor by myself with very little effort.
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Old 07-11-2011, 01:34 PM
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What weight anchor for 22/23 ftr?
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