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Old 04 February 2010, 12:57   #21
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but only seems to hold well in a rocky situation.....
Tricky if you need it in a sticky situation so...
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Old 04 February 2010, 16:14   #22
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general rule

Hi there

From what I see there may some large anchors on too little chain.

I believe that a smaller anchor and much more chain gives a better job.

It can stop you veering around and keeps the pull horizontal on the anchor.

If you anchor near other boats they will often lie differently to the wind/tide and you want the smallest circle to lie in.
Paul
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Old 04 February 2010, 16:25   #23
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From what I see there may some large anchors on too little chain.
What length of chain would you recommend, is there any rule of thumb for amount of chain for weight of anchor/ length of boat, ratio of chain to warp etc?

Puffin
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Old 04 February 2010, 16:52   #24
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What length of chain would you recommend, is there any rule of thumb for amount of chain for weight of anchor/ length of boat, ratio of chain to warp etc?

Puffin
Rough rule of thumb have the chain the same length as the boat.
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Old 05 February 2010, 01:09   #25
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Recommended by who?
I have one, I like the way it stows nicely but only seems to hold well in a rocky situation.....
It was recommended by the chandlers I went to - as he had every type of anchor under the sun, I felt it was a moderately unbiased view point. I've not used one before so have no idea how it might perform.
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Old 05 February 2010, 05:54   #26
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What length of chain would you recommend, is there any rule of thumb for amount of chain for weight of anchor/ length of boat, ratio of chain to warp etc?

Puffin
MGN280 (commercial code requirements) gives the minimum anchor cable as 4x boat length or 30m (whichever is longer) with minimum 10m or 20% of the total length as chain.
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Old 05 February 2010, 07:37   #27
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problem with a lot of anchor, chain and length of anchor warps is, most ratio,s were calculated many years ago with heavy displacement boats or deep keeled yachts in mind, in gale force conditions using standard admirity pattern or traditional fishermans type anchors,, much before the popular advent of small planing craft ,and the inroduction of modern designed high hold anchors ,have to agree though even the smallest boats need a 3/ 4 meters of chain if not to help with the scope but to stop chaffe and wear on rocks ,and a lot depends on the type of sea bed that you are going to anchor in .
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Old 05 February 2010, 11:26   #28
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For ground tackle, you sort of have to balance what you're doing with what the guys who made the suggestions were doing. For instance, the 7:1 minumum scope suggestion was based on a fairly large boat anchoring overnight in areas where high wind and swell were likely. For a recreational boat, anchoring for, say, a few hours, that would be overkill (though granted, it would still work well.)

For diving in Central California, we usually use a scope of 3 or 4 times the depth if it's windy or swells are up; as little as 1.5 or 2:1 if it's calm. In general, we aren't off the boat for more than about an hour or so.

Dry Doc's suggestion of 4x chain would have the chiropractors here really happy, but I doubt that any of the smaller boats would follow it anyway. I could see it for a ship doing work in open ocean, but not for a RIB doing recreational stuff.

jky
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Old 07 February 2010, 03:49   #29
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Dry Doc's suggestion of 4x chain would have the chiropractors here really happy, but I doubt that any of the smaller boats would follow it anyway. I could see it for a ship doing work in open ocean, but not for a RIB doing recreational stuff.

jky
4x boat length refers to total length of chain and rope!
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Old 07 February 2010, 04:15   #30
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problem with a lot of anchor, chain and length of anchor warps is, most ratio,s were calculated many years ago with heavy displacement boats or deep keeled yachts in mind, in gale force conditions
Overkill is good

I rarely use my anchor but I would rather have a lot of chain/rope in the bow and not use much of it, than one day need a lot and not have enough. A bit of weight in the bow is good for keeping aviation levels down as well
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