Anchor recommendation pls - Page 2

willk · 01 July 2019, 14:46

Quote:

Originally Posted by Bushrider

What sort of RIB you are talking about ?
My 8.6m diesel RIB does not even weight half what you mention .

Mine. However, it's only half lardy as his yacht in reality

With a planing hull, it reacts very differently to swell when anchored.

Pete7 - no real beef with anything you said, except to (very politely and respectfully) say that any anchor that has to be assembled before use on a small boat is, IMVHO, pointless in the extreme. I've had to deploy twice in anger over the years and each time it was a rush to get to the locker, never mind play "hunt the spanner". That said, I know the OP's anchor locker - I used to have one the same and it's not THAT small. Realistically, he won't be anchoring in a storm in some exposed bay off Galway - he absolutely WILL be mooring off beaches and ease of deployment is essential. If I was him, I'd take the grapnel off, put a shackle on it and store it in the bottom of the locker. Stick a simple, cheap, easy to use thing (5/7.5kg Bruce anyone?) on the original chain and go play with it for a trip or two. The old grapnel can always be used as suggested as an angel to weight the chain if needed offshore some swelly day when things go Pete Tong.

GuyC · 01 July 2019, 14:53

The Lloyds Rules equipment number, which is the number that determines anchor and chain size is dependent on displacement and frontal area.

Most yachts will be significantly ahead of RIBs on both counts.

The workboat code:

https://www.gov.uk/government/public...ll-craft-codes

suggests a 7m vessel should have a 9kg anchor and 8mm chain with at least 10m of chain. It also states that this is for a vessel that is meant to ride out storms and when the sea bed is unfavourable.

As a result I'd say PD's 1kg of anchor and 1m of chain per metre of boat seems a sensible start point.

HDAV · 01 July 2019, 15:20

Quote:

Originally Posted by willk

The only anchor I actually regularly use is the one from my SIB, a 2.5kg Bruce knockoff on 12m of 8mm warp and some 4m of light chain. I use it to hold the 10m, 2.75t RIB during lunch breaks and photo sessions when over sand and mud in currents and waves. Bizarrely it hasn't let go yet....

That’s the size I use with similar amount of chain and 10m of warp holds multiple vessels in every condition I have tried added 40ft of line to anchor in Torbay for the air show in 13m+ of water for 2+ hours!

Pete7 · 01 July 2019, 17:06

Quote:

Originally Posted by willk

Realistically, he won't be anchoring in a storm in some exposed bay off Galway - he absolutely WILL be mooring off beaches and ease of deployment is essential.

Ha, that is just the scenario I was envisioning

Haven't visited Ireland, but am intimate with the Co Antrim and Down coasts after many years of diving. In the early days (1991) we did use a large grapple in a bucket with some chain and rope on the rib, a little 5.2m. However, things have moved on and really great anchors and knowledge on how to best use them, is now available.

Be interesting which way Paul decides to go.

Quote:

Originally Posted by willk

The old grapnel can always be used as suggested as an angel to weight the chain if needed offshore some swelly day when things go Pete Tong.

Sorry but any weight that can comfortably be deployed from a rib won't have any effect on catenary of an anchor chain once the wind pipes up.

http://kb.rocna.com/kb/Scope_vs_catenary

paulb33 · 01 July 2019, 18:22

Thanks for the helpful replies. I’m actually learning a lot from the disagreements!

My choice will be one that effectively holds the fine sand bottom (through the copious kelp) ashore of the island beaches....but will also be sufficient if we get stranded further out in the Atlantic. So it needs to be readily handled in the boat by a novice...but safe.

I’m wondering if I add a Spade to the existing rope/chain rode. Then use my current 5kg grapple as a beach anchor. My thinking is it will help on the beaching to hold the boat steady to shore when anchored. So, the RIB is bow tied out to main anchor...and a line into the beach with buried grapple.

I’m wondering this because last year the boat tended to drift around with the wind when anchored in the small coves (and into the rocks..). A problem created because I don’t want to be too far from shore. I’m dropping passengers and then swimming in from the boat.

Is this the best way to keep the boat fixed to an anchor just off the beach? I tried beaching it on the sand but there are just too many small buried rocks to comfortable rest the RIB on the sand (even with its keel guard).

What do folks think?

Pete7 · 01 July 2019, 19:18

Yes, that would work, popular technique in Nordic countries were they tie to the shore.

Have you seen this:

https://www.gumtree.com/p/sailing-eq...arp/1344374568

Kelp is difficult btw as it tends to grow on clean rock and any anchor will have problems. The traditional fishermans or grapple will work the best here, but even so holding power limited.

Dr. Hook · 01 July 2019, 19:38

Quote:

Originally Posted by paulb33

Thanks for the helpful replies. I’m actually learning a lot from the disagreements!

My choice will be one that effectively holds the fine sand bottom (through the copious kelp) ashore of the island beaches....but will also be sufficient if we get stranded further out in the Atlantic. So it needs to be readily handled in the boat by a novice...but safe.

I’m wondering if I add a Spade to the existing rope/chain rode. Then use my current 5kg grapple as a beach anchor. My thinking is it will help on the beaching to hold the boat steady to shore when anchored. So, the RIB is bow tied out to main anchor...and a line into the beach with buried grapple.

I’m wondering this because last year the boat tended to drift around with the wind when anchored in the small coves (and into the rocks..). A problem created because I don’t want to be too far from shore. I’m dropping passengers and then swimming in from the boat.

Is this the best way to keep the boat fixed to an anchor just off the beach? I tried beaching it on the sand but there are just too many small buried rocks to comfortable rest the RIB on the sand (even with its keel guard).

What do folks think?

That sounds like kedging to me! https://www.yachtingmonthly.com/sail...e-anchor-32123

paulb33 · 01 July 2019, 19:43

Quote:

Originally Posted by Pete7

Have you seen this:

https://www.gumtree.com/p/sailing-eq...arp/1344374568

Ooh, that would be perfect. Just a little too far to travel..

paulb33 · 01 July 2019, 19:51

Quote:

Originally Posted by Dr. Hook

That sounds like kedging to me! https://www.yachtingmonthly.com/sail...e-anchor-32123

Good to know I didn’t make it up.

willk · 01 July 2019, 19:54

Quote:

Originally Posted by paulb33

I’m actually learning a lot from the disagreements!

Difference of opinions... Pete7 is a Gent

Pete7 · 01 July 2019, 20:02

Quote:

Originally Posted by willk

Difference of opinions... Pete7 is a Gent

Equally I also highly value Willk's contributions and advice

Pete

paulb33 · 01 July 2019, 20:05

Quote:

Originally Posted by willk

Difference of opinions... Pete7 is a Gent

disagreement
/dɪsəˈɡriːmənt/

noun
lack of consensus or approval.

[emoji12]

willk · 01 July 2019, 20:21

Quote:

Originally Posted by paulb33

disagreement
/dɪsəˈɡriːmənt/

noun
lack of consensus or approval.

[emoji12]

C'mere, are you trying to start something?

paulb33 · 01 July 2019, 20:29

Quote:

Originally Posted by willk

C'mere, are you trying to start something?

No. Just being an ‘anchor.

Pikey Dave · 01 July 2019, 21:23

Quote:

Originally Posted by Pete7

Equally I also highly value Willk's contributions and advice

Pete

Quote:

Originally Posted by willk

Difference of opinions... Pete7 is a Gent

Sheesh! Get a room you two[emoji6]

pagick · 01 July 2019, 23:44

Box anchor is the number one choice on our sand bottom lakes, rivers. Holds in weeds and rock mix. I add a 10’
stretch line instead of chain to absorb wave tugging. It folds flat for storage.
https://youtu.be/Mv2ybwgcaL8

Dan Gurney · 02 July 2019, 12:26

Quote:

Originally Posted by pagick

Box anchor is the number one choice on our sand bottom lakes, rivers. Holds in weeds and rock mix. I add a 10’
stretch line instead of chain to absorb wave tugging. It folds flat for storage.
https://youtu.be/Mv2ybwgcaL8

Interesting...

Pete7 · 02 July 2019, 14:34

Quote:

Originally Posted by paulb33

I’m wondering if I add a Spade to the existing rope/chain rode. Then use my current 5kg grapple as a beach anchor.

If the budget will withstand buying a Spade then that would be a brilliant choice. They have always rated highly in anchoring tests. The lack of a roll bar helps with storage and also has an advantage in that mud doesn't tend to cling compared to anchors with roll bars, as Steve highlights in the video posted earlier. I couldn't afford the Spade so opted for a Rocna and use a brush when anchoring in mud.

Pete