Anchor - How much rope?

Jessk9 · 04 March 2012, 14:39

Hi all
I have a 4m honwave an just got a anchor 3.2kgs an 4m of 8mm chane how much rope (m) should I use?
Thanks russ

jezza2011 · 04 March 2012, 15:29

depends on how deep the water is :-)

I have about 40Mtr on My rib with the ability of adding in a further 60 if needed
My anchor is light but does the trick.

And it does depend on how deep the water is. if your in 60Mtr of water with 40Mtr or anchor and rope your not going to hit the bottom.

but for costal in shore I think 30mtr to 40mtr would be fine. worked for me and my rib.

m chappelow · 04 March 2012, 16:04

In theory the general recomended ratio for boats are approx, ,,, chain only 3 x depth
,, rope only 5x depth.

but most of these calulations were made many years ago in Victorian times , in gale force conditions using deep heavy displacement hulled sailing boats using the common Admiralty /fishermans type of anchor ,
i am not saying there wrong but light planning craft of today using high hold type anchors and thinner high stretch modern man made ropes perhaps dont need as much ,
minimum i take is 30 mtrs , a lot also depends on the area your operating in ,
best be safe and take along more rather than less .

Jessk9 · 04 March 2012, 16:20

Thanks for your replies, I think I'll get 40 m as I'll only ever be in shore I think an like you said I could always add to it
Thanks russ

willk · 04 March 2012, 16:26

Linky

Another angle.

Jessk9 · 04 March 2012, 16:37

Quote:

Originally Posted by willk

Linky

Another angle.

That was good to read thanks
Much more to think about now

MI3GTO · 04 March 2012, 16:54

Quote:

Originally Posted by Jessk9

That was good to read thanks
Much more to think about now

Sorry to hijack the thread but what type of anchor do you guys carry?

Jessk9 · 04 March 2012, 16:59

Quote:

Originally Posted by MI3GTO

Sorry to hijack the thread but what type of anchor do you guys carry?

I have a 3.2kg folding grapnel anchor

lockieboi · 04 March 2012, 17:08

Quote:

Originally Posted by MI3GTO

Sorry to hijack the thread but what type of anchor do you guys carry?

Same here, grapnel folding anchors are ideal for SIBs.

Peter_C · 05 March 2012, 05:44

Quote:

Originally Posted by lockieboi

Same here, grapnel folding anchors are ideal for SIBs.

I own a folding grapnel anchor for my kayak and would never consider it for my boat. They "FOLD" and often when you don't want them too. I need my boat to be waiting for me at the surface.

My preference is for a Bruce or Danforth style anchor. I have a Danforth.

Since we often anchor in 30 meters (100ft) of water, we carry 97 meters (320ft) of rope, with 4.5 meters (15ft) of chain. Everything packs cleanly into a milk crate mounted in the bow. Since I boat with other people I also like the anchor line markers for length. Super easy to say, "put out 120ft" and they can find the marker labeled as such. The end of the anchor line is also tied into the milk crate to keep stupid from happening.

Curious if others do something similar as below? Or where do you tie your anchor off too?

The tow bridle in the front was built for anchoring so there are always two points of contact on the boat. Hence why it also has a knot in the front for the carabiner to pass thru in case one side breaks loose it won't slip away.

m chappelow · 06 March 2012, 09:38

[QUOTE=Peter_C;448887]I own a folding grapnel anchor for my kayak and would never consider it for my boat. They "FOLD" and often when you don't want them too.

Good point there Peter C ,
From past experience not a bad idea to bob a cable tie around the lock ring if its slack
also if the boat is moving/drifting fast they can also tumble /spin along certain types of sand or flat seabed or flat rockscar for a long time before latching on,

jyasaki · 06 March 2012, 15:09

I've never seen a grapnel actually hook up in sand. I have, however, seen them hook up too well in a boulder bottom.

Depends on the substrate you'll be anchoring in, but I would go with a better design for just about any bottom type. The space savings doesn't justify the lack of security with a grapnel.

jky

willk · 06 March 2012, 18:52

I've used my 2.5kg Bruce in sand, it held the SIB perfectly well against a combined tide and wind. It's VERY small and presents no puncture risk to a SIB.

captnjack · 06 March 2012, 19:08

I have a Bruce as well, the grapel is not reliable enough for me to leave the boat unattended. Mine is 6kgs I think? I use about 5ft of really heavy 3/8" chain and then 10 more feet of lighter 1/4" chain. Then 250ft of 3/8" line.

Smithyyy · 06 March 2012, 21:04

Curious if others do something similar as below? Or where do you tie your anchor off too?

The tow bridle in the front was built for anchoring so there are always two points of contact on the boat. Hence why it also has a knot in the front for the carabiner to pass thru in case one side breaks loose it won't slip away.

[/QUOTE]

Like the bridle, can I ask what knot you use to connect the carabiner to the anchor rope at the desired depth?

captnjack · 06 March 2012, 21:14

Quote:

Originally Posted by Smithyyy

Curious if others do something similar as below? Or where do you tie your anchor off too?

Like the bridle, can I ask what knot you use to connect the carabiner to the anchor rope at the desired depth?

I just used the front ring on my SIB. The 3 point connection was overkill IMO. The bitter end (inside) was tied off to one of the interior grab lines.

I now have a RIB, but don't have an anchor roller. To avoid having the anchor line rubbing the tubes under tension I use a short 2 carabiner bridle from the bow eye. I use a clove hitch to attach the free carabiner to the anchor line at the chosen length/depth. The other end is tied off to an eye bolt inside the anchor locker so if the carabiner or knot were to fail the boat will still be anchored just alot more line will be out.

Smithyyy · 06 March 2012, 23:33

Ah I see - like this then for the anchor line end? (picture credit wikipedia!)

captnjack · 06 March 2012, 23:46

Quote:

Originally Posted by Smithyyy

Ah I see - like this then for the anchor line end? (picture credit wikipedia!)

Works well for me, and comes undone after being loaded. Just leave some slack in the boat end so the knot can cinch properly. You could certainly tie various other hitches, but few come undone nicely after being loaded like a clove hitch.

I would skip the locking carabiner, the locking sleeve will seize up in saltwater pretty fast. The wire gated carabiners work well and when they get sticky you can wash the corrosion off with vinegar in a ultrasonic bath.

hint: make two bites (aka "ears"), one with each hand in the same direction either clockwise or counterclockwise doesn't matter. Then pass them on opposite sides of each other. Clip the carabiner into the middle and you're done. Having a hard time finding a diagram of how to tie it...

raymillard · 07 March 2012, 08:28

I reckon you should carry as much as you conveniently can. Your chain will hold the anchor stock down, and the more rope you have, within reason, the more securely and comfortably you will sit at anchor. Oh, and do work in yards, not metres!

BumbleAbout · 07 March 2012, 08:59

Clove hitch (and many other knots) Clove Hitch using Loops | How to tie a Clove Hitch | Boating Knots

I pull a 2 foot loop of the anchor line through the bow eye attached carabiner (a stainless steel locking one) and then secure this to the line going back down to the seabed with a round turn and two half hitches - I have seen clove hitches slip as tension is applied and released.