anchor setup advice appreciated

[SHALDON PETE]

Hallo have a 5.7m BRIG rib wish to have a suitable anchor set eg wt length , chain length currently have from a previous rib 2.5 kilo collapsible anchor plus 25 meters suspect this too light all suggestions most welcome

[beerbelly]

all depends on where your planning on anchoring .but a general rule is 1kg per meter for your anchor and if you use 8mm chain i would use about the same length as your rib so 6 meters. then twice the depth of water that you may end up in of rope .. an average set up for a boat your size would be a 5kg bruce or plow anchor on 6 meters of 8mm closed link chain and say 50 meters of 8mm to 10mm rope . oh and welcome

[treerat]

As beerbelly says, depends hwat you're doing with it. I carry a 6kg folding anchor on my 5.5. This has around 8m of chain then 30m of warp, with the ability to extend.

Would I leave the rib for any length of time on this set up? Would I heck but it works for fishing and the odd bit of picnics / swimming off. It fits the locker, doesn't bounce about and is easy to pull back up.

When leaving the boat it'll get swopped for the CQR, I just don't carry it as normal practice.

[morin1]

Good day,
I’m a strong believer in chain combined with a high elongation rope and a long scope. Yes 2,5 kg is to light for an all around use for your boat. Mostly because this anchor is probably too small in size to get a good grip on the bottom.
I personally use on a 5.3 meter boat a 4 kg folding grapnel anchor, 3 meter of chain and 60 meter of nylon rope. Never being use in a storm, but I never had any problem with the combined tide and current of the St-Lawrence River. If you can safely store a bigger anchor (or a better type for the type of bottom you encounter the most) and a longer chain it just going to be better.

[lakelandterrier]

Originally Posted by beerbelly

all depends on where your planning on anchoring .but a general rule is 1kg per meter for your anchor and if you use 8mm chain i would use about the same length as your rib so 6 meters. then twice the depth of water that you may end up in of rope .. an average set up for a boat your size would be a 5kg bruce or plow anchor on 6 meters of 8mm closed link chain and say 50 meters of 8mm to 10mm rope . oh and welcome

Agree with the above, but I'd use min 12mm line as thicker rope is a lot easier to handle when hauling back in. I have a 5kg Bruce, with 8m of chain and 75m of line - probably overkill, but better than finding you've not got enough. I work to 3x line for depth - traditionally the rule of thumb for yachts 3x depth for chain, 5x depth for rope.

[SHALDON PETE]

THANK you all very much indeed really helpful will be in the chandlers the morning hope all of you see this thank you

[lakelandterrier]

Hope to see you out and about sometime- I was brought up in Shaldon, mother still lives there. now keep my boat at Brixham. Unfortunately I no longer live in Devon but am not too far away!

[jwalker]

Personally I think 8mm chain is too large and way more in strength than you'll ever need. It's also heavy to haul up if you lay it fairly deep. 6mm will be fine and you could carry more length to make up the weight if you feel it's necessary. The bigger diameter the rope (within reason!) the better for handling and the softer the grip the better it is on your hands. You may think that's overkill but wait until the day you've laid the anchor, the wind blows up and you have to haul it aboard heaving your boat against the wind.

[gpsguru]

Originally Posted by SHALDON PETE

Hallo have a 5.7m BRIG rib wish to have a suitable anchor set eg wt length , chain length currently have from a previous rib 2.5 kilo collapsible anchor plus 25 meters suspect this too light all suggestions most welcome

I launch from Polly Steps with a Ribcraft 585. I use a 3.5Kg bruce, 5m of 6mm chain, and 12mm 3 strand Nylon. The Rope Locker in Dawlish often have offers on 220m coils (126 fathoms) of rope. Generally I let out 3 x times depth (out of habit), but twice the depth holds just fine.......

[spartacus]

I always tend to over-spec things. For years I'd used a 3.5kg folding anchor, but the boat was never moored, it was always launch and retrieve. So last year I was headed to the west coast for 2 weeks and know it's a sheltered sea loch, sandy bottom, but it's connected to the Atlantic and is subject to strong tidal swell if the wind gets up.

Boat is 4.8m Ribcraft, so put 5kg Bruce anchor, with 5 meters of 8mm galvanised short link, then 30m of 12mm 3-ply nylon rope.

Oh and I used the folding anchor too as a back-up!

[lakelandterrier]

Originally Posted by spartacus

I always tend to over-spec things.

Well nobody ever said "I wish I had less chain or a shorter anchor line"

My anchor & line is well over spec-ed - 8m of chain when I could use 5-6m, 14mm line when I could use 10mm, 80m of line. when some might live with a lot less.

I consider my anchor line also the emergency long tow line and the line I'd use to deploy the sea anchor if the proverbial hit the fan, so can't have it long or strong enough.

[SHALDON PETE]

Originally Posted by lakelandterrier

Hope to see you out and about sometime- I was brought up in Shaldon, mother still lives there. now keep my boat at Brixham. Unfortunately I no longer live in Devon but am not too far away!

next time your able to be here drop me a note a glass awaits

[lakelandterrier]

Originally Posted by SHALDON PETE

next time your able to be here drop me a note a glass awaits

Thank you kind Sir noted! I'll pm you my number.

Only problem with dropping into the Teign by RIB is there is nowhere to park to get ashore easily. I don't like beaching my lovely shiny GRP hull on stones

[36valley]

Originally Posted by lakelandterrier

Thank you kind Sir noted! I'll pm you my number.

Only problem with dropping into the Teign by RIB is there is nowhere to park to get ashore easily. I don't like beaching my lovely shiny GRP hull on stones

Don't they have visiting pontoons? If so some of us have a tender.

[lakelandterrier]

No I don't thinks so. We don't all have the big RIBs with tenders carried

[mikehhogg]

military spec on a 7mtr rib, cqr and no chain,you are not trying to anchor the QE2,I never used a chain on a rib anchor,try to pull in a hundred feet in a hurry.

[beamishken]

Originally Posted by mikehhogg

military spec on a 7mtr rib, cqr and no chain,you are not trying to anchor the QE2,I never used a chain on a rib anchor,try to pull in a hundred feet in a hurry.

No chain at all is worse than an underspec anchor as the chain does a large portion of the work. A boats length of chain on 3x water depth of rope is my prefered method. A folding grapple for lunch stops but anchoring overnight its a delta or bruce style. But never without any chain.

[mikehhogg]

on a 10,000 ton ship the chain is the key part of the anchoring system but on a 1000kg rib its about as useful as the male nipple. How many people actually overnight on a rib . I presume we are talking about Ribs. a couple of feet of chain may help the anchor to dig in faster,but is a pain in the you know what to haul back in and tends to leave nasty rust stains . Then again Doctors differ and patients die. I guess whatever works for different ground and different situtations.

[mikehhogg]

and what I should have added different anchors

[Lee argyle]

Originally Posted by beamishken

No chain at all is worse than an underspec anchor as the chain does a large portion of the work. A boats length of chain on 3x water depth of rope is my prefered method. A folding grapple for lunch stops but anchoring overnight its a delta or bruce style. But never without any chain.

+1 https://www.rya.org.uk/knowledge-adv...-the-gear.aspx

Anything bigger than a tender we always use a percentage of chain, although we don’t bother with grapples...........