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Old 10-30-2009
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using 3 anchors as a mooring

i have a 30ft. morgan and would like to set up a mooring using 3 anchors. any suggestions on anchor weight, chain size, ans shackle size?????
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Anchors are no substitute for proper mooring gear, buy a mushroom or whatever solution is proven in your area and not have to worry about your boat ending up on the beach, or worse.
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Old 10-30-2009
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I tried this one summer a long time ago with a 14' flat bottomed day sailor. Worked great until the lines tangled and eventually chafed through. It is rather distressing to come down to your mooring field and see neither boat nor float.
The boat drifted ashore across the harbor about a mile or 2 away and someone pulled it up on shore.
We retrieved it and it was basically fine but this would not have been the case if it was a keel boat.
New mushrooms should cost about $1/# and less for a used one.
Here is a thread about a boat that was left on a single anchor: Well my day really sucked.
I second Sailingfool's advice.
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Old 10-30-2009
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Personally, I'm not convinced that the 3-anchor method is bad, but you end up spending more than if you just went with a properly sized mushroom anchor. That's because each anchor and it's chain of sufficient scope has to hold the boat all alone, and will hold the boat all alone, depending on where the wind is coming from. Then add to the 3 big anchors and 3 chain rodes the cost of shackles and a big swivel and you get a cost greater than using a single mushroom anchor.

I'm still contemplating a 3-BIG-anchor approach and even bought several 100 pound anchors for that purpose a year ago. Looking at the anchors though, I'm not sure I trust them -- Chinese made, and if even only one fails you are in a heap of trouble.

Hope that helps. Unless you are very prepared to make a big beefy strong expensive no-holds-barred 3 anchor approach, go for a mushroom anchor like everyone else does. Just my humble opinion, and my lawyer wants me to add that you should not follow any of my advice since I'm not an expert.

Oh yes, and there are some good books on anchoring out there.
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thanks for the info everyone, the river bottom is muddy here in charleston and i have also considered a mushroom anchor. i think most people just throw something heavy in the water here but thought 3 anchors would work well and be cost effective if bought used. i have heard stories of mushrooms not setting and dragging which shouldnt be the case, either way the bottom holds from what i have heard...
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Old 11-02-2009
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Anchors are a good idea, if they're well over-sized for the bottom type and intended scope. Obviously a proper anchor is a lot better at its job and more efficient on a weight-for-weight basis than a simple mushroom or any dead-weight mooring.

With a lighter mooring spread over three units, they're also much easier to deploy and later recover and move.

The downside of course is cost.
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Old 11-02-2009
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What about an auger? They are said to perform very well, tho you will need a large diameter model driven deep if yours is a silty mud. Low materials cost. Placing one underwater is a little tricky -- was it Sailnet that had a slideshow of someone using PVC pipe to drive an auger in?

Still need to spend real money on swivels and chain. But if y'all think augers work well, we might put one in our local lake next spring, before the water level rises. Any ideas how to calculate holding power vs expected loads on an auger?
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I just retrieved my anchors after leaving my boat anchored in a river for 4 years with minimal supervision. I had two anchors, one upstream and one down. A Danforth type and a plow, connected to a heavy swivel. After a couple of years the swivel froze and since the swinging wasn't random the chains wound themselves around...and around... and around. I had plenty of scope to start so even at the end it wasn't too short. Just beware that swivels can freeze up.

I should have replaced the swivel but where I am there are none available.
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Old 09-06-2011
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Quote:
Originally Posted by Epicurean View Post
I just retrieved my anchors after leaving my boat anchored in a river for 4 years with minimal supervision. I had two anchors, one upstream and one down. A Danforth type and a plow, connected to a heavy swivel. After a couple of years the swivel froze and since the swinging wasn't random the chains wound themselves around...and around... and around. I had plenty of scope to start so even at the end it wasn't too short. Just beware that swivels can freeze up.

I should have replaced the swivel but where I am there are none available.
You got lucky. Moorings need to be look at periodically -- and some towns require a formal inspection, IIRC.

You can buy swivels online, at places like Defender.com.

Regards,
Brad
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Old 09-11-2011
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There's a great article in "Chapman" on precisely this same subject.
Dick
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