anchor types and chain length

[cyberpunx]

hi all im looking for some good advice. this seems the only place you actually get good advice. well it's to do with anchors ive got a 21feet fjord day cruiser which is used around the clyde area near largs marina. what im asking for is how do i work out how long the anchor chain has to be and what size it should be and also what rope and how long sould that be finally what type of anchor should i be getting . i know different ones for different seabeds i dont know what kind of bed is around arran or largs and the clyde? any help appreciated .
im buying the anchor that most people recommend here . as i said everything else seems to have worked out well .
thanks for info on antifouling. worked a treat now ive just got to get stuff back on.

but any websites you know about how i should be working this out please help.
but i prefer personal help seems to be more accurate.
cheers john

 

[goochie]

I'm not an expert on anchoring by any means and others will be along shortly, but here's a few for starters.

Check your charts of your intended cruising ground for the type of seabed.

The anchor debate is long and never really resolved as each person has their own favourites, but from personal experience, comments by others, and several magazine tests, if you get a delta type anchor you can't go too far wrong, although they can be more expensive than some. Many people (myself included) have used a danforth type quite succesfully.

Try and use as much chain as possible, ideally four times the max depth you plan to anchor in.

As to size, I await the experts on that one.

 

[nonitoo]

I replied to your last posting and as has been said before it is very much a personal choice.

The CQR (and, I assume, the modern equivalent the Delta) have always served me well on the west coast of Scotland. Used with a lot of chain (that amount depends on the depth in which you intend anchoring) but a length of at least 4-6 times the anchorage depth should be allowed.

Have a look around the local marinas and see what the boats there are using and ask the owners for their opinions.

Local knowledge is really the answer as the seabed encountered on the west coast of Scotland will be different to that found in the Thames Estuary or the Solent for example.

Good luck

Tom

 

[nonitoo]

A bit of Googling brought this up:-

Boat size Chain size Anchor size

6m (20ft) 6mm 8kg (18lb) 4kg (9lb)

8m (26ft) 8mm 10kg (22lb) 6kg (14lb)

10m (33ft) 8mm 13kg (29lb) 10kg (22lb)

Anchor DELTA, CQR or BRUCE

No idea where it originated or how reliable it is but my boat fit is roughly in agreement (Bruce 7.5kg) with the list above.

Why not have a look at http://www.anchor-marine.com.au/anchor&.htm for more information.

Tom

 

[cyberpunx]

thanks lads im convinced now
i appreciate it all the lads who have given me advice on previous posts
cheers john

 

[Richard10002]

Have a read of this for some food for thought.

http://alain.fraysse.free.fr/sail/rode/rode.htm

I am planning to buy a Rocna FWIW

 

[craigsmith]

Anything talking exclusively about CQRs and Deltas is entirely out of date.

[ QUOTE ]
well it's to do with anchors ive got a 21feet fjord day cruiser which is used around the clyde area near largs marina.

[/ QUOTE ]You probably want a ~6Kg something.

[ QUOTE ]
what im asking for is how do i work out how long the anchor chain has to be and what size it should be and also what rope and how long sould that be finally what type of anchor should i be getting.

[/ QUOTE ]The rode make-up entirely depends on your situation. You need enough chain to keep the rope out of abrasive situations, then enough rope to make up a total length long enough to give you adequate scope. Polyester multiplait is the best material for the rope, avoid nylon (especially three-strand).

You can read up on the background to these issues:
<ul type="square">[*]www.rocna.com/boat-anchors
[*]Rocna User's Guide (bunch of stuff about general anchoring)[/list]
[ QUOTE ]
i know different ones for different seabeds i dont know what kind of bed is around arran or largs and the clyde? any help appreciated .

[/ QUOTE ]That isn't true, it's old lore and a good anchor will work in all bottom types.

 

[alan006]

I agree with what people have said about different solutions and how in recent years the choice available has increased enormously. In the old days the rule of thumb was for small boats a lb in weight for every foot of lenght of the boat.
It still gives a usefull very rough guide to anchor size.

 

[BartW]

Its not the anker that keeps the boat in place, but mainly the length of chain on the bottom.
Our rule of thumb is;
length of chain on the bottom is min. 3 x boatlength,
lenth of chain or rope going up is min 3 times depth of water,
so total length, is sum of both, more is better,
ofcause there are more factors, such as seestate, tides, weight of boat,....
To our experience different anker types don't have that much influence...

 

[cyberpunx]

again gents you've outdone yourself im looking around now for the best deal i can get on this info.
thanks alot to all who had input . if i can help electrically let me know cheers john

 

[hlb]

Dont take everything to literally. An anchor is not like a hand brake. With a 21ft boat, it's about what you can manage as much as what is best. There are no guarantees what ever you get.