Sy-Revolution
Well-Known Member
Hi,
What wieght of anchor would I need for a 37ft 7tonne yacht
For
A) Kedge
B) Danforth
Cheers.
What wieght of anchor would I need for a 37ft 7tonne yacht
For
A) Kedge
B) Danforth
Cheers.
What Weight anchor?
- Thread starter Sy-Revolution
- Start date
duncan
Well-Known Member
hmmm............
a kedge is a purpose to which an anchor is put and a danforth is a type of anchor...........?
or are you asking what weight of Danforth anchor would be suitable as a kedge for this craft?
a kedge is a purpose to which an anchor is put and a danforth is a type of anchor...........?
or are you asking what weight of Danforth anchor would be suitable as a kedge for this craft?
TigaWave
Well-Known Member
This is a good guide
http://bluemoment.com/codeofpractice/annex5.html
But you will no doubt get many opinions on weight and type...
http://bluemoment.com/codeofpractice/annex5.html
But you will no doubt get many opinions on weight and type...
G
Guest
Guest
biggest you can handle for bow main anchor .... biggest you can stow for kedge.
That is regardless of boat size. I don't personally agree with small anchors for small boats ......... except dinghys etc. of course. Small anchors don't dig in .. simple.
That is regardless of boat size. I don't personally agree with small anchors for small boats ......... except dinghys etc. of course. Small anchors don't dig in .. simple.
Sultans_Kapitein
RIP
Good clear concise reply Nigel, just what I have come to expect, shame there are not more like you on this forum !?
Sy-Revolution
Well-Known Member
Thanks /forums/images/graemlins/smile.gif
theforeman
Well-Known Member
the dreaded lakesailor methinks !!!!
Lizzie_B
Well-Known Member
There is a good table of not only different types, but also different makes of allegedly the same type on www.boatus.com in there shop/anchors section. I would go at least one size up on the standard recommendation, but as Nigel says go for the biggest you can handle - but certainly use the tables for absolute minimum below which you should not go.
Useful for if say you can handle max weight of 40lb, which make/type will give you the most holding power for your 40lb in weight /forums/images/graemlins/cool.gif
Useful for if say you can handle max weight of 40lb, which make/type will give you the most holding power for your 40lb in weight /forums/images/graemlins/cool.gif
bluedragon
Well-Known Member
Gotta disagree with you on this one Nigel. This summer I changed from a 25lbs CQR clone (Souwester) on chain to a genuine Delta at almost 1/2 the weight (6kg) on my 27 footer. The Delta sets faster, seems to hold just as well, and is much easier to break-out when vertical. The big CQR type is relegated to ballast now (or a storm anchor that I plan to never use). I don't have an anchor windlass, so it's all muscle power and anchoring with the big one is back-breaking work.
PS - interesting article on Delta vs. CQR here www.multihullsmag.com/magazine/articles/delta.htm
PS - interesting article on Delta vs. CQR here www.multihullsmag.com/magazine/articles/delta.htm
G
Guest
Guest
Why disagree ??
I never said what type of anchor .... I only said get the biggest you can handle / stow.
As to type - that is down to bottom condition and anchoring depths / locations etc. One type will suit one area - another another area ... etc. Yes there are general anchors ... bruce, delta, cqr, plough etc. - I likle plough - never had a problem .. others have.
I particularly didn't say which type on this thread - as he didn't ask - he asked for weight.
Is that ok ??
/forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif
I never said what type of anchor .... I only said get the biggest you can handle / stow.
As to type - that is down to bottom condition and anchoring depths / locations etc. One type will suit one area - another another area ... etc. Yes there are general anchors ... bruce, delta, cqr, plough etc. - I likle plough - never had a problem .. others have.
I particularly didn't say which type on this thread - as he didn't ask - he asked for weight.
Is that ok ??
/forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif
26ft_bathtub
Well-Known Member
Don Dodds has an interesting chapter in Modern Seamanship covering the physics of anchoring (it's not light reading though).
A couple of interesting conclusions he comes to are that most boaters carry unnecessarily heavy anchors, and that nylon rode provides higher holding strength than chain in depths of less than 50ft.
That said, your anchor decision is going to be based on a whole bunch of factors, including your boat's windage and wetted surface area, seafloor composition, winds, tides and currents where you plan to be anchored, and so on.
A Danforth-type makes for an excellent kedge because of its massive weight to holding-power ratio (id est: you can carry a little one and it'll still work). For your working hook, you might consider having a plough type, like the CQR, or even a Bruce. Danforths have a habit of coming unstuck if the winds or currents shift to much.
[ETA: To answer your question, the recommended weight Danforth for your boat is the 25lb-er. A 13lb Danforth as a kedge would probably be about right.]
A couple of interesting conclusions he comes to are that most boaters carry unnecessarily heavy anchors, and that nylon rode provides higher holding strength than chain in depths of less than 50ft.
That said, your anchor decision is going to be based on a whole bunch of factors, including your boat's windage and wetted surface area, seafloor composition, winds, tides and currents where you plan to be anchored, and so on.
A Danforth-type makes for an excellent kedge because of its massive weight to holding-power ratio (id est: you can carry a little one and it'll still work). For your working hook, you might consider having a plough type, like the CQR, or even a Bruce. Danforths have a habit of coming unstuck if the winds or currents shift to much.
[ETA: To answer your question, the recommended weight Danforth for your boat is the 25lb-er. A 13lb Danforth as a kedge would probably be about right.]
G
Guest
Guest
Holding power is great so far .....
But when you have a hard bottom that your lightweight high holding power anchor cannot dig its flukes in ..... what are you going to do then ? You normally do not know quality of bottom until you either drag or lift anchor and see it on the anchor !
I will always advocate weight is important along with design.
I will also poo-poo all rope rode as the weight of the rope is insufficient to get it to form an inertial catenary. Rope rodes snatch far worse than a chain ... chain has weight ... tends to damp the boats motion .... watch a few boats anchored in waves ... see which bounces around more in similar style boats but one having a rope rode ... If you must have rope - then at least have enough chain before the anchor to get a decent lay on the bed before rising up to your bow.
If I have any idea that a boat is laying to an all rope rode - I make sure I keep well clear of it ... and especially uptide / upweather of him ..... Sorry but seen too many rope jobs drag ... there is no substitute for sheer kgs ......
IMHO of course ....
But when you have a hard bottom that your lightweight high holding power anchor cannot dig its flukes in ..... what are you going to do then ? You normally do not know quality of bottom until you either drag or lift anchor and see it on the anchor !
I will always advocate weight is important along with design.
I will also poo-poo all rope rode as the weight of the rope is insufficient to get it to form an inertial catenary. Rope rodes snatch far worse than a chain ... chain has weight ... tends to damp the boats motion .... watch a few boats anchored in waves ... see which bounces around more in similar style boats but one having a rope rode ... If you must have rope - then at least have enough chain before the anchor to get a decent lay on the bed before rising up to your bow.
If I have any idea that a boat is laying to an all rope rode - I make sure I keep well clear of it ... and especially uptide / upweather of him ..... Sorry but seen too many rope jobs drag ... there is no substitute for sheer kgs ......
IMHO of course ....
26ft_bathtub
Well-Known Member
Re: Holding power is great so far .....
Yes, definitely worth at least having a big anchor on board, in case your working anchor won't bite.
[ QUOTE ]
...the weight of the rope is insufficient to get it to form an inertial catenary...
[/ QUOTE ]
That's what I'd thought, but apparently the inherent stretch in the nylon (only nylon rope, of course) is more than the equivalent give in a chain catenary--except in water deeper than about 50ft.
[ETA: Oh, and when I talk about nylon rode, I'm assuming about half a boat-length of chain before the anchor. I don't know anyone who uses just rope.]
Yes, definitely worth at least having a big anchor on board, in case your working anchor won't bite.
[ QUOTE ]
...the weight of the rope is insufficient to get it to form an inertial catenary...
[/ QUOTE ]
That's what I'd thought, but apparently the inherent stretch in the nylon (only nylon rope, of course) is more than the equivalent give in a chain catenary--except in water deeper than about 50ft.
[ETA: Oh, and when I talk about nylon rode, I'm assuming about half a boat-length of chain before the anchor. I don't know anyone who uses just rope.]
G
Guest
Guest
Re: Holding power is great so far .....
shallow water maybe ... cause the angle is then imposed by the lack of water and the extra rode needed if rope.
Yes there are some who use all rope .... honest ! Seen it. BUt at least a length of chain is IMHO advantage.
As to stretch in a rope ... ok - but I would still prefer the weight created curve in chain that damps a boats movement and also reduces the shock loads to an anchor. I still reckon IMHO that an anchor is less likely to break out when using chain ... as the weight of chain has to be overcome before anchor takes the load ... but rope ?
I have 120ft of chain on my boat ... I don't anchor in real deep water ... so I am fairly confident that my heavy plough and all chain will hold - as it has done so many times before in good and bad weather.
shallow water maybe ... cause the angle is then imposed by the lack of water and the extra rode needed if rope.
Yes there are some who use all rope .... honest ! Seen it. BUt at least a length of chain is IMHO advantage.
As to stretch in a rope ... ok - but I would still prefer the weight created curve in chain that damps a boats movement and also reduces the shock loads to an anchor. I still reckon IMHO that an anchor is less likely to break out when using chain ... as the weight of chain has to be overcome before anchor takes the load ... but rope ?
I have 120ft of chain on my boat ... I don't anchor in real deep water ... so I am fairly confident that my heavy plough and all chain will hold - as it has done so many times before in good and bad weather.
Constance
Well-Known Member
Kiwi Ground Tackle
If you haven't made any decision yet, it's at least worth considering Rocna and Anchor Buddy, both curiously from New Zealand.
The Rocna anchor claims to offer the best setting and holding ability in sand/mud etc for the weight, enabling a lighter anchor to be carried. I have a 10kg one (but a 6kg would do according to the mfrs) on my 25-footer displacing nearly 2t. The demo video on their web site of their product vs all other types is impressive. It doesn't stow particularly easily on a small boat like mine, other than on a bow roller. Mine goes in the stern and is deployed from the cockpit.
Anchor Buddy is a well-designed rode weight which a) answers the problem of mostly-rope rode not being heavy enough to pull at the right angle and b) serves very well to reduce your radius of swing in a tight anchorage.
I have one of each, but have not yet tested them in extreme conditions. The anchor does seem to have phenomenal burying / holding ability, perhaps too much for casual use, when I use a fisherman, and the Anchor Buddy proved very effective recently in a tight anchorage at the end of Kirby Creek on the Walton Backwaters, where I would have been on the mud at LW otherwise.
For a rode weight almost anything will do of course, but Anchor Buddy is so well-designed and easy to deploy and recover that I feel if you can find its cost it's well worth it.
If you haven't made any decision yet, it's at least worth considering Rocna and Anchor Buddy, both curiously from New Zealand.
The Rocna anchor claims to offer the best setting and holding ability in sand/mud etc for the weight, enabling a lighter anchor to be carried. I have a 10kg one (but a 6kg would do according to the mfrs) on my 25-footer displacing nearly 2t. The demo video on their web site of their product vs all other types is impressive. It doesn't stow particularly easily on a small boat like mine, other than on a bow roller. Mine goes in the stern and is deployed from the cockpit.
Anchor Buddy is a well-designed rode weight which a) answers the problem of mostly-rope rode not being heavy enough to pull at the right angle and b) serves very well to reduce your radius of swing in a tight anchorage.
I have one of each, but have not yet tested them in extreme conditions. The anchor does seem to have phenomenal burying / holding ability, perhaps too much for casual use, when I use a fisherman, and the Anchor Buddy proved very effective recently in a tight anchorage at the end of Kirby Creek on the Walton Backwaters, where I would have been on the mud at LW otherwise.
For a rode weight almost anything will do of course, but Anchor Buddy is so well-designed and easy to deploy and recover that I feel if you can find its cost it's well worth it.
26ft_bathtub
Well-Known Member
Re: Holding power is great so far .....
Agreed.
Chain also offers the additional advantage of being chafe-proof.
Incidentally, do you have any idea how much 120ft of chain weighs? I did a quick Google search, and came up empty.
Agreed.
Chain also offers the additional advantage of being chafe-proof.
Incidentally, do you have any idea how much 120ft of chain weighs? I did a quick Google search, and came up empty.
Blueboatman
Well-Known Member
Whilst there are better anchors around now,I still would say bigger is best.
My 21ft had 35lb cqr on 90ft 1/4 chain which I felt was about right.The fisherman was a hefty 25lb jobby with 100ft multiplait.
Handling was immensely simplified by having a custom stemhead fitting with a notch to drop the chain into when hauling up...
Went through some really quite serious bad weather on those two,and FELT secure.
My 21ft had 35lb cqr on 90ft 1/4 chain which I felt was about right.The fisherman was a hefty 25lb jobby with 100ft multiplait.
Handling was immensely simplified by having a custom stemhead fitting with a notch to drop the chain into when hauling up...
Went through some really quite serious bad weather on those two,and FELT secure.
bluedragon
Well-Known Member
Re: Why disagree ??
[ QUOTE ]
I never said what type of anchor .... I only said get the biggest you can handle / stow.
As to type - that is down to bottom condition and anchoring depths / locations etc. One type will suit one area - another another area ... etc. Yes there are general anchors ... bruce, delta, cqr, plough etc. - I likle plough - never had a problem .. others have.
I particularly didn't say which type on this thread - as he didn't ask - he asked for weight.
Is that ok ??
/forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif
[/ QUOTE ]
Ok...I wasn't entirely fair to you.../forums/images/graemlins/grin.gif But assuming you feel 6kg is a small anchor, I had no problems digging-in on a variety of bottoms around the Bristol Channel and W.Wales this year. I was also one of the "bigger the better" brigade until early this summer when my aching back got the better of me and I put my "little" Delta onto the chain end...boy was it so much easier! So now my motto is "only as big as you actually need"...that's my view anyway.
[ QUOTE ]
I never said what type of anchor .... I only said get the biggest you can handle / stow.
As to type - that is down to bottom condition and anchoring depths / locations etc. One type will suit one area - another another area ... etc. Yes there are general anchors ... bruce, delta, cqr, plough etc. - I likle plough - never had a problem .. others have.
I particularly didn't say which type on this thread - as he didn't ask - he asked for weight.
Is that ok ??
/forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif
[/ QUOTE ]
Ok...I wasn't entirely fair to you.../forums/images/graemlins/grin.gif But assuming you feel 6kg is a small anchor, I had no problems digging-in on a variety of bottoms around the Bristol Channel and W.Wales this year. I was also one of the "bigger the better" brigade until early this summer when my aching back got the better of me and I put my "little" Delta onto the chain end...boy was it so much easier! So now my motto is "only as big as you actually need"...that's my view anyway.
jeanne
Well-Known Member
Re bluedragon
Try anchoring on a kelp bottom with a light anchor. It will skid over the kelp and never touch the sand.
This whole question depends on what you want to do at anchor.
If you are having lunch, and you know what the bottom is like, then have whatever anchor you fancy.
If you have arrived in an unknown harbour, and you really want to go to sleep for ten hours, you want the heaviest anchor you can manage.
I have a 75 lb bower anchor on 10 ton boat, which self stows, you never need to lift it, and I would hate to sail with less.
Try anchoring on a kelp bottom with a light anchor. It will skid over the kelp and never touch the sand.
This whole question depends on what you want to do at anchor.
If you are having lunch, and you know what the bottom is like, then have whatever anchor you fancy.
If you have arrived in an unknown harbour, and you really want to go to sleep for ten hours, you want the heaviest anchor you can manage.
I have a 75 lb bower anchor on 10 ton boat, which self stows, you never need to lift it, and I would hate to sail with less.
G
Guest
Guest
120ft .... weight ????
Dunno .... but it's darn heavy when ranging it for checks !! Funny enough you'd think that Data sheets / books would list it - as it can be important consideration on a boat ..... even Nicholsons Data book doesn't give it.
Dunno .... but it's darn heavy when ranging it for checks !! Funny enough you'd think that Data sheets / books would list it - as it can be important consideration on a boat ..... even Nicholsons Data book doesn't give it.
