Anchor Size

buzzbomber

Seaman Apprentice
Joined
Apr 3, 2011
Messages
45
I have a trophy 1903, about 19 1/2 feet and 2500 lbs. I have a danforth anchor on it now but it seems to drag and i'm doing the 7-1 ratio with about 5 feet of chain.

Just wondering what size would be best? don't know the exact size I have now, can't check for a couple days.

mostly boat in san diego and looking for the best all around anchor that will keep me in one spot.
 

americaneagler77

Petty Officer 1st Class
Joined
Jun 15, 2011
Messages
231
Re: Anchor Size

i have a 16 foot boat with an over kill anchor rig. i run a 10 pound danforth with about 10 feet of chain that is THICK chain alone is another ten pounds, my boat never moves an inch with this rig. in a calm flowing river yesterday i stopped in 8 feet of water, threw out 20 or 25 feet of chain and rope. dad pulled along side me in his much heavier 21 footer and tied to me and we didnt move an inch in 2 hours. over kill but it works
 

Fireman431

Rear Admiral
Joined
Sep 17, 2007
Messages
4,292
Re: Anchor Size

Buzzbomber, first off, double up (at least) on your chain length. The true recommendation is to have enough chain to equal the length of the boat. Depending on wind, tidal conditions, and the bottom of whatever you're anchoring in, you may be able to get away with less. I would recommend 10-12' at minimum. The chain is what keeps the anchors shaft lying on the bottom. 5' of chain can be easily lifted with boat movement. Aside from that, 7:1 ratio only holds 81% of it's rated capacity. 10:1 ratio holds 100%, but that can be difficult, depending on the water depth. Also, when you anchor, you should be setting it under power (reverse). Allowing the boat to set it's own anchor under drift will not bury the anchor and more than likely you will not be truly anchored.

Deciding on a certain size of anchor can be a bit of a guessing game. Since conditions are always changing, there is no "right" size for the job at hand. One misconception people make when shopping for an anchor is the heavier the better. This is just not true. Physical size of the anchor, rather than weight, is actually a better indicator of the anchors holding ability. (Some anchors that only weigh 5lbs. can hold in excess of 1,000 pounds!) When it comes to choosing an anchor, bigger (size) is almost always better. Bigger anchors have more strength to resist breaking, occupy more of a surface area to resist pullout and will have larger flukes which penetrate deeper. Go with the biggest anchor you can get by with for the size of your watercraft; the last thing you need when rough weather arrives is an inadequate anchor that doesn't do the job.
 

buzzbomber

Seaman Apprentice
Joined
Apr 3, 2011
Messages
45
Re: Anchor Size

Thanks for the advice, I think i'll increase my chain to about 12-15 feet. There's plenty of room in the anchor hold on the boat. Also going to look at getting another danforth but a size up. Looking at their size chart I believe mines the right size for the boat, but just doesnt stick. I'll probably keep my current one as a spare somewhere on the boat.

Might be doing an overnight anchor at catalina soon so want to make sure boats going to stick.
 

Navigator_Victory

Petty Officer 1st Class
Joined
Apr 3, 2011
Messages
284
Re: Anchor Size

I saw my first Box anchor this weekend....if you are in sand that might be a good option but, very pricey guy told me he paid $300 but, no matter what it catches in the sand......just a thought
 

nikon

Petty Officer 2nd Class
Joined
Jan 12, 2011
Messages
193
Re: Anchor Size

I have the smallest aluminum fortress anchor w/ 5ft of chain. Holds my 20' no problem...add to that 2 other 20-23' tied to the side of me in a 5-8 knot current and it never moves....literally buries itself....best purchase I've made.
 

buzzbomber

Seaman Apprentice
Joined
Apr 3, 2011
Messages
45
Re: Anchor Size

Yea the fortress anchors look pretty sweet. Cost some $$$ though.
 

Pez Vela

Chief Petty Officer
Joined
Dec 4, 2004
Messages
504
Re: Anchor Size

Don't skimp on your gear if you want to have confidence in it. Spend the money and get 20' of 1/4" chain as a minimum to go with a 9# (or bigger) traditional Danforth anchor. If you're serious about anchoring overnight at Catalina Island, you might want to consider upgrading that. Depending upon where you want to be, you will most likely be required to anchor in water depths exceeding 100'. Sufficient anchor line (300' or better) would be advised. You'd be better off just getting a mooring, particularly if you're not adept at anchoring.

By way of comparison for anchoring in our local San Diego conditions, I use a 13# traditional Danforth, and 30' of 5/16" chain for my 25' boat. That rig allows me to sleep well at night. For a lunch hook, a 9# traditional Danforth and 15' of 5/16" chain works.
 

buzzbomber

Seaman Apprentice
Joined
Apr 3, 2011
Messages
45
Re: Anchor Size

Yea, I can up the chain amount to 20', as far as the anchor goes I just checked and have the 9 lb traditional danforth good for 17-27 what the specs say. I'm probably going to go one size up.

Was originally planning to moor or stringline but all the camp-sites other than boat-in are booked in two harbors.

With all that chain and anchor should be easy to set and i'll be better off here in san diego. Appreciate the input.
 

shrew

Lieutenant
Joined
Dec 29, 2006
Messages
1,309
Re: Anchor Size

excuse my ignorance but, I googled both the fortress and danforth....do not see a difference ?

http://www.fortressanchors.com/fortress_anchor_guide.html

http://www.danforthanchors.com/standard.html

Danforth = Original company name that invented the style of anchor. That style is now made by a variety of companies. Now Danforth, despite being a specific company, is synomous with any anchor of this style. The Danforth is Steel.

Fotress = Danforth style anchors made of aluminum. The can be disassembled and broken down for storage. These also come with an adjustable fluke angle that is 'Standard' or a wider angle for mud/soft bottom anchoring.
 

Navigator_Victory

Petty Officer 1st Class
Joined
Apr 3, 2011
Messages
284
Re: Anchor Size

Thanks Shew....I was thinking maybe the blades were twisted a little more on one than the other.....
 

nikon

Petty Officer 2nd Class
Joined
Jan 12, 2011
Messages
193
Re: Anchor Size

^^ The fortress are typically bigger and lighter than a comparable steel anchor. Doesn't use weight as much as it does digging power and surface area.

And I gotta say...20' of chain sounds excessive, that's all my dad has on his 34' cabin cruiser.
 

Fireman431

Rear Admiral
Joined
Sep 17, 2007
Messages
4,292
Re: Anchor Size

^^ The fortress are typically bigger and lighter than a comparable steel anchor. Doesn't use weight as much as it does digging power and surface area.

And I gotta say...20' of chain sounds excessive, that's all my dad has on his 34' cabin cruiser.

I have a 37' Carver and 290' of chain. No rope/line at all. I'm willing to bet that the whole mess weighs as much as a house though!
 

nikon

Petty Officer 2nd Class
Joined
Jan 12, 2011
Messages
193
Re: Anchor Size

LOL, I don't even think you need an anchor with all that chain...
 

buzzbomber

Seaman Apprentice
Joined
Apr 3, 2011
Messages
45
Re: Anchor Size

Haha yea that is a ton of chain. Well i've read a couple places that boat length should = chain length.

I figure i'd rather error on the safe side.
 
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