Anchor size

[hydroforce3]

hi guys, just been into the garage and picked up my anchor. i have a 2kg bruce/claw type anchor with 10ft of galvn 6mm chain onto 140m of 5mm braided rode, ive never thought of this but the anchor seems very small, i know its not all about size but im worried that if i anchor and its flat calm but then wind causes a slight chop will my anchor still give me good holding power. i have a 10ft sib and there is usually 2 persons aboard with gear. (safety equip, rods, tackle, backpack so the small sib weighs quite a bit. do you guys think i should get a heavier anchor or will my current 2kg anchor do the job?

cheers in advance

[beamishken]

The chain does almost as much as the anchor
The trick is to have enough chain so the weight of the chain prevents the shank of the anchor being lifted
If you can maintain the anchor in a flat plane then it will hold much better than if it's being lifted up
A longer rope will also help by reducing the angle of pull on the anchor
If you think it's going to be a little choppy let out more rope 3:1ratio length of rope to water depth is a minimum but more if it's lumpy

[hydroforce3]

ok so my 2kg anchor will do the job aslong as i pay out more rope when conditions apply

[jeffstevens763@g]

I have a 2 kg Bruce and a fold up just for sticking on the bow line after launching, as said plenty of chain and plenty of rope out to keep the pull low

[Poly]

2kg Bruce will be fine on 10ft sib

[hydroforce3]

awesome guys thanks for all your help and replies

[Max...]

That's more than enough on a SIB of any size and probably fine on a sub 5m RIB.

[Mikefule]

There was an interesting article in the Dinghy Cruising Association forum about this. Most of the work is doe by the catenary curve in the anchor line which acts as a giant shock absorber. With enough line out, the curve never straightens out enough for the load to make the anchor drag. (I simplify.)

I know that it is quite common for RIB/SIB users to use quite a short and tight line which is in fact less effective and less comfortable in a swell.

I suggest you keep the anchor and chain but make sure you have plenty of line - about 8 times the depth you expect to anchor at.

[Max...]

I've had the same anchor set up for some time - 2kg Bruce, few m chain etc.

Looking to save space as always.

Has anyone tried the tiddly 1kg Bruces?

[Max...]

Bump - anyone find a 1Kg works OK?

[rik_elliott]

i tried a 1kg bruce about 6 years ago on my first sib (4m ancient avon supersport with wooden floor). it dragged, and we drifted loads. I probably didnt have enough line out as i was a bit fresh to boating back then, but i knew enough to have a decent length of chain on it. since using a 2kg anchor ive never had any trouble.