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Old 04 March 2004, 18:57   #21
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Is a grapnel anchor useful for anything? I've often considered carrying a second anchor, probably a grapnel with say 5m chain and 20m rope incase it all goes tit's up???
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Old 04 March 2004, 19:01   #22
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Originally posted by Brian

I scratched my head and couldn't work out why I need nearly double the weight of anchor (for a given boat) if I was going galvanised or stainless, as against half the weight if aluminium????????
Don't know but an aluminium anchor of equivalent physical size to a steel one will be considerably lighter.
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Old 04 March 2004, 19:15   #23
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Brian, i think JW is trying to say (and i agree) a 10kg aluminium anchor with be much larger (therefore greater holding "power") than a 10kg galvanised one. Hence you you can use a lighter one for the same holding "power" if it aluminium.
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Old 04 March 2004, 19:35   #24
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Er, no, I wasn't trying to say that but that will also be the case.

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Old 05 March 2004, 02:29   #25
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Quote:
Originally posted by Daniel
Is a grapnel anchor useful for anything?
Yes and no - I've been out on a friend's RIB and he uses a small grapnel (same size as I used to use on my SIB) on a 6.5 m without any chain. He's never lost the boat! But they don't inspire much confidence.

Now Brian - own up, has Daniel got to the root of the matter here? What's the old anchor on Cyanide?
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Old 05 March 2004, 04:10   #26
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I thought the more chain the better, obviously on a small rib this is going to be impractical for stowage and weight reasons ?

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Old 05 March 2004, 04:56   #27
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chain

Yes - just highlighting the poor set-up.
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Old 05 March 2004, 05:22   #28
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Is a grapnel anchor useful for anything?

Daniel
Hi I use a Danforth style anchor for my main anchor & a large Grapnel as a second it will hold ok but I have found you do kneed more chain/weight (I have had to attach diving weights to the end of the chain to keep it down) than with other anchors! So as a back up you end up with a lot of extra weight!
If you are in to diving they are good for locating a wreck, but that dose not say much for their holding power.
Nick
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Old 05 March 2004, 07:06   #29
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Cyanide currently has a "toothpick" folding grapnel type with 2 x 5m of chain (fixed in parallel, thus each end of a 5m length is fastened to the anchor and the other end of each length is fastened to the rope), the rope is probably 8 or 10mm and has an unknown length (my guess is 20m). Now, whichever way you look at it that is totally inadequate and certainly not up to the Irish Cruise we intend to embark on in May. Hence my request for advice here.
After taking everyone's advice, I now intend to purchase a 7.5kg aluminium Bruce with 10m of chain and 30m of good 10 or 12mm rope. I ideally want someone to "build" it for me, with shackling at the anchor and rope ends of the chain (so I can alter the anchor point fixing) and with a nice metal lined whipped loop end to the chain-end of the rope. I need to check first whether all that will go into my anchor locker through the small circular hatch.
Richard/JW
OK, now i understand that a 5kg aluminium would be "the same size" as a 10kg s/s one. And therefore offer a similar holding power.
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Old 05 March 2004, 07:24   #30
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Don't be frightened of chain. It is easier to grip when hauling aboard, it stows very easily, it doesn't wind up like some ropes, it doesn't carry nearly as much water aboard, it's simple to tie markers to for the purpose of measurement, it won't fray, it's very strong, you can shackle directly to it.......
The only down side, for the boat, is it's weight but it's bu**er all for a big rib to carry and it'll help keep the bow down a little into a head sea.

Tell me again why you'd want to use rope.....
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