Which Sailboat Anchor Is
Right For Your Boat?

It's often said that your sailboat anchor is the best insurance you'll ever buy. And so it is - providing it's the right one!

The 'right one' meaning not just the right design for the type of seabed you're anchoring on, but the appropriate size for your sailboat - and of course, even the best of anchors will fail to please if it's on too short a scope or dumped on the seabed with a load of chain piled on top of it.

There's plenty of data around recommending the appropriate anchor size for a sailboat of a specific length, but before we get on to talking about the various anchor designs, we'll repeat it here...

Matching Sailboat Anchor Size to Boat Length

The following table sets out the minimum size of sailboat anchor for a vessel of a particular length. It is, at best, just a guide. If you regularly have to rely on your anchor in less than ideal conditions you'd be wise to choose one for the next boat size up.

Boat length 6m/20ft 8m/26ft 9m/30ft 10m/33ft 11m/36ft 12m/40ft
Anchor Weight 7kg/15lb 9kg/20lb 12kg/25lb 14kg/30lb 16kg/35lb 18kg/40lb

And this presupposes that you've deployed sufficient scope of anchor rode, and your anchoring technique is up to scratch.

What Should You Expect From a Good Sailboat Anchor?

There's been something of a revolution in sailboat anchor technology in recent years. The old guard - CQR, Bruce, Danforth and Fisherman - have been challenged by a new generation of young upstarts, the main contenders being Spade, Rocna and Bugel (aka Wasi in the USA).

The essential attributes we demand from our anchor are:

  • It must dig in fast every time - If it doesn't it will have a chance to collect weed before it starts to penetrate the seabed;

  • It must bury deep - The deeper it buries, the greater the mass of seabed above and ahead of the anchor - the cone of resistance - and therefore the greater the holding power;
  • It must provide high holding power - Holding power is achieved as a result of surface area, blade profile and the depth to which the anchor has buried. But given sufficient load, all anchors will eventually drag. Those anchors that remain buried while dragging, rather than capsizing and pulling out, are clearly to be preferred. The static holding power, that is the resistance provided before the anchor starts to drag in sand appears to be no more than 20 times the anchor weight, and sometimes as little as 10 times for a less efficient anchor. This varies with the nature of the seabed. So if you use a 15kg anchor, its static hold is unlikely to be greater than 300kgf. For a 10m yacht this is the force which likely to be experienced in a 40 knot wind, and for a 12m yacht in a 33 knot wind;
  • It must hold in wind or current shifts - A real test of an anchor occurs when the wind shifts or the tide turns. In these conditions some types have a tendency to roll and pull out rather than drag around to face the new direction, and others that have failed to bury themselves completely and leave bits sticking above the seabed are likely to be tripped.

Sailboat Anchor Designs

Not all sailboat anchors are created equal - some are at their best in sand and mud, whilst others will drag in these seabeds but hold firm in kelp and rocks. Here're the most popular patterns, starting with those that have been around for a while:~

The Old Guard...

The Fisherman Anchor

A good one to start with this, as it's been around since Admiral Nelson was in short trousers. Also known as the Admiralty Pattern Anchor and sometimes the Yachtsmans Anchor, it's probably the best of all for holding in rock or thick kelp.

Once set, the stock will be lying horizontally on the seabed, one fluke will have dug into it and the other will be sticking up above it, perfectly positioned to hook up with the chain when the tide turns.

The stock can be released so that it can lie alongside the shank, making it an easy anchor to disassemble and stow below. But once assembled it's anything but convenient - as you'll know if you've ever tried to get one out of the water and onto the foredeck.

Clearly this is never going to be a favourite bower anchor with cruising sailors.

The CQR Anchor

So named because it sounds like 'secure', the UK designed CQR (or Plough) Anchor has proved to be a popular bower anchor with cruising sailors since it first appeared in 1933.

Like the Bruce Anchor below, it stows well in the stemhead fitting, but is difficult to stow anywhere else - and they'll pinch your fingers if not handled with care.

The CQR can deal with changes in tide direction and currents through its patented swivel system, which allows it to accommodate wide swing angles before it has to reset itself.

The Danforth Anchor

Also known as a Fluke Anchor, the US designed has been with us since the 1940's when it was developed for World War 2 landing craft.

When deploying this anchor it's essential that it has no way on when it hits the seabed, or it will skate merrily over it without penetrating at all.

Once properly set there's no sailboat anchor that holds better than a Danforth Type Anchor in sand and mud, but on most other types of seabed it doesn't perform well at all.

And when asked to realign itself when the wind or tide changes direction it's unlikely to do so, much preferring to twist over and break out.

Neither will it stow well in the stemhead fitting, but it does fold flat and stows well below decks or in an anchor locker. It also stows nicely on the pushpit, where it can be put into ready use as a kedge anchor.

The Fortress Anchor is one of several light-weight aluminium anchors similar in appearance to the Danforth, but with larger flukes. And in common with the CQR Anchor they will pinch your fingers at the slightest provocation.

The Bruce Anchor

Also known as Claw Anchors, these one-piece British designed anchors have been around since the 1970's, when huge versions of them they were developed for use in the developing North Sea Oil Industry.

Bruce Type Anchors have a reputation as a good all-round sailboat anchor, but they do have difficulty penetrating weed and grassy seabeds.

On the plus side, once properly set they will realign themselves with wind and tide changes, rather than rolling over and breaking out.

They're awkward to stow anywhere other than in the stemhead fitting.

The Delta Anchor

Another plough anchor like the CQR Anchor but without the finger-pinching tendencies of the pivoting arrangement, and of one-piece construction like the Bruce, the Delta Anchor is something of a hybrid.

It's been around since the 1980s, but more recently lightweight aluminium versions have appeared which mean that you can go up a size without having to cope with additional weight.

And the Best Sailboat Anchor Is...?

To a greater or lesser extent, all of these anchors meet the four principal performance criteria, but some perform better in certain types of seabed than others. For example, the Danforth is as good as any in sand, although there is a risk of it rolling and pulling out as the tide turns; and nothing beats a Fisherman in rock or kelp.

But there has been some advanced thinking in the design of the new generation anchors, as a result of which they all provide excellent holding power, and are generally more reliable in their deployment

  • If they land upside down, they immediately turn right way up ready for immediate penetration as the load comes on the chain. The Spade Anchor achieves this through weight distribution and an angled ballast chamber and both the Rocna and the Bugel by a roll-bar;
  • They dig in very quickly - the Spade Anchor in particular is said to do so within its own length;
  • They completely bury themselves in most seabed conditions and re-align quickly with changes in wind and tide without pulling free;

For anyone contemplating the purchase of a new anchor, they should have a serious look at one of these new generation anchors.

And here they are:~

The New Breed of Anchors

The Bugel Anchor

Known as the Wasi Anchor in the US, this German design from the early 1990s is the forerunner of the new breed of sailboat anchors, and the first to sport the rollover bar.

The Bugel anchor a simple design which keeps manufacturing costs down, but still provides excellent performance in most seabed conditions.

Like the following designs it will bury itself and turn to accommodate changes in tide and current without breaking out.

The Spade Anchor

A French design from 1996, the Spade Anchor was initially developed for punching through the seagrass often found in Mediterranean anchorages.

Its two-part design can be readily disassembled with a spanner (wrench) for convenient stowage in a locker, but it will stow neatly in the stemhead fully assembled and ready for deployment.

It's balanced such that it always arrives on the seabed point down, which enables it to set very quickly. The ultimate holding power of the Spade Anchor is renowned.

The Rocna Anchor

Have we left the best till last?

In my view yes; the Rocna Anchor is a winner and a 44lb version graces Alacazam's bow roller.

Designed in New Zealand, it's been around since 2004 and has become a favourite of cruising sailors worldwide.

It combines the basic design of the Bugel with the sophistication of the Spade Anchor and in all the sailboat anchor test reports I've read comes out on top.

Like the Bugel Anchor, it's designed to live in the bow roller; it's awkward to stow it anywhere else.

The Rocna Anchor is immensely strong, has superb holding power and is one of the very best sailboat anchors currently available. Here's just one example of why I believe this to be true...

The only issue with the Rocna is that it the rollover bar makes it difficult to stow in some bow fitting configurations. The new Rocna Vulcan is a spade anchor said to have similar holding power to the original Rocna whilst offering the greatest possible compatibility across a wider range of vessel bow configurations.

Artwork by Andrew Simpson

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