Anchor

An anchor is a device, normally made of metal, used to connect a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin ancora, which itself comes from the Greek ἄγκυρα (ankura).[1][2]

"Boat anchor" redirects here. For the metaphor, see Boat anchor (metaphor).

For other uses, see Anchor (disambiguation).

Stockless ship's anchor and chain on display

Anchor of Amoco Cadiz in Portsall, north-west Brittany, France

Anchors can either be temporary or permanent. Permanent anchors are used in the creation of a mooring, and are rarely moved; a specialist service is normally needed to move or maintain them. Vessels carry one or more temporary anchors, which may be of different designs and weights.

A sea anchor is a drogue, not in contact with the seabed. It is used to control a drifting vessel, or to limit the speed of a sailing yacht running "under bare poles" in a storm.

Overview

A stockless anchor being broken out

Holding ground in Akaroa Harbour

Anchors achieve holding power either by "hooking" into the seabed, or sheer mass, or a combination of the two. Permanent moorings use large masses (commonly a block or slab of concrete) resting on the seabed. Semi-permanent mooring anchors (such as mushroom anchors) and large ship's anchors derive a significant portion of their holding power from their mass, while also hooking or embedding in the bottom. Modern anchors for smaller vessels have metal flukes which hook on to rocks on the bottom or bury themselves in soft seabed.

The vessel is attached to the anchor by the rode (commonly called cable when made of rope, and made of chain in larger vessels), or a combination of these. The ratio of the length of rode to the water depth is known as the scope; generally, the rode should be between 5 and 10 times the depth to the seabed, giving a scope of 5:1 or 10:1; the larger the number, the shallower the angle is between the cable and the seafloor, and the less upwards force is acting on the anchor. A 10:1 scope gives the greatest holding power, but also allows for much more drifting due to the longer amount of cable paid out. Anchoring with sufficient scope and/or heavy chain rode brings the direction of strain close to parallel with the seabed. This is particularly important for light, modern anchors designed to bury in the bottom, where scopes of 5:1 to 7:1 are common, whereas heavy anchors and moorings can use a scope of 3:1, or less. Some modern anchors, such as the Ultra will hold with a scope of 3:1; but, unless the anchorage is crowded, a longer scope will always reduce shock stresses.

Since all anchors that embed themselves in the bottom require the strain to be along the seabed, anchors can be broken out of the bottom by shortening the rope until the vessel is directly above the anchor; at this point the anchor chain is "up and down", in naval parlance. If necessary, motoring slowly around the location of the anchor also helps dislodge it. Anchors are sometimes fitted with a tripping line attached to the crown, by which they can be unhooked from rocks or coral.

The term aweigh describes an anchor when it is hanging on the rope and is not resting on the bottom. This is linked to the term to weigh anchor, meaning to lift the anchor from the sea bed, allowing the ship or boat to move. An anchor is described as aweigh when it has been broken out of the bottom and is being hauled up to be stowed. Aweigh should not be confused with under way, which describes a vessel which is not moored to a dock or anchored, whether or not the vessel is moving through the water.

Holding ground

Holding ground is the area of sea floor which holds an anchor, and thus the attached ship or boat.[3] Different types of anchor are designed to hold in different types of holding ground.[4] Some bottom materials hold better than others; for instance, hard sand holds well, shell very poorly.[5] Holding ground may be fouled with obstacles.[5] An anchorage location may be chosen for its holding ground.[6] In poor holding ground, only the weight of an anchor matters; in good holding ground, it is able to dig in,[7] and the holding power can be significantly higher.[8]

Evolution of the anchor

Main article: History of the anchor

Anchors come in a wide variety of shapes, types, and sizes for different conditions, functions and vessels

The earliest anchors were probably rocks, and many rock anchors have been found dating from at least the Bronze Age.[9] Pre-European Maori waka (canoes) used one or more hollowed stones, tied with flax ropes, as anchors. Many modern moorings still rely on a large rock as the primary element of their design. However, using pure mass to resist the forces of a storm only works well as a permanent mooring; a large enough rock would be nearly impossible to move to a new location.

The ancient Greeks used baskets of stones, large sacks filled with sand, and wooden logs filled with lead. According to Apollonius Rhodius and Stephen of Byzantium, anchors were formed of stone, and Athenaeus states that they were also sometimes made of wood. Such anchors held the vessel merely by their weight and by their friction along the bottom.

Fluked anchors

Anchor of the Ladby Ship

Iron was afterwards introduced for the construction of anchors, and an improvement was made by forming them with teeth, or "flukes", to fasten themselves into the bottom. This is the iconic anchor shape most familiar to non-sailors.

This form has been used since antiquity. The Roman Nemi ships of the 1st century AD used this form. The Viking Ladby ship (probably 10th century) used a fluked anchor of this type, made entirely of iron.

Admiralty Anchor

An Admiralty Pattern anchor; when deployed on the seafloor the stock forces one of its flukes into the bottom

The Admiralty Pattern anchor, or simply "Admiralty", also known as a "Fisherman", consists of a central shank with a ring or shackle for attaching the rode (the rope, chain, or cable connecting the ship and the anchor). At the other end of the shank there are two arms, carrying the flukes, while the stock is mounted to the shackle end, at ninety degrees to the arms. When the anchor lands on the bottom, it will generally fall over with the arms parallel to the seabed. As a strain comes onto the rode, the stock will dig into the bottom, canting the anchor until one of the flukes catches and digs into the bottom.

The Admiralty Anchor is an entirely independent reinvention of a classical design, as seen in one of the Nemi ship anchors. This basic design remained unchanged for centuries, with the most significant changes being to the overall proportions, and a move from stocks made of wood to iron stocks in the late 1830s and early 1840s.

Since one fluke always protrudes up from the set anchor, there is a great tendency of the rode to foul the anchor as the vessel swings due to wind or current shifts. When this happens, the anchor may be pulled out of the bottom, and in some cases may need to be hauled up to be re-set. In the mid-19th century, numerous modifications were attempted to alleviate these problems, as well as improve holding power, including one-armed mooring anchors. The most successful of these patent anchors, the Trotman Anchor, introduced a pivot where the arms join the shank, allowing the "idle" arm to fold against the shank.

Handling and storage of these anchors requires special equipment and procedures. Once the anchor is hauled up to the hawsepipe, the ring end is hoisted up to the end of a timber projecting from the bow known as the cathead. The crown of the anchor is then hauled up with a heavy tackle until one fluke can be hooked over the rail. This is known as "catting and fishing" the anchor. Before dropping the anchor, the fishing process is reversed, and the anchor is dropped from the end of the cathead.

Stockless anchor

Main article: Stockless anchor

The stockless anchor's ease of stowage and handling saw its widespread adoption in spite of not holding as well as the Admiralty pattern it was derived from

The action of a stockless anchor being set

The stockless anchor, patented in England in 1821,[10] represented the first significant departure in anchor design in centuries. Though their holding-power-to-weight ratio is significantly lower than admiralty pattern anchors, their ease of handling and stowage aboard large ships led to almost universal adoption. In contrast to the elaborate stowage procedures for earlier anchors, stockless anchors are simply hauled up until they rest with the shank inside the hawsepipes, and the flukes against the hull (or inside a recess in the hull).

While there are numerous variations, stockless anchors consist of a set of heavy flukes connected by a pivot or ball and socket joint to a shank. Cast into the crown of the anchor is a set of tripping palms, projections that drag on the bottom, forcing the main flukes to dig in.

Small boat anchors

Until the mid-20th century, anchors for smaller vessels were either scaled-down versions of admiralty anchors, or simple grapnels. As new designs with greater holding-power-to-weight ratios, a great variety of anchor designs has emerged. Many of these designs are still under patent, and other types are best known by their original trademarked names.

Grapnel anchor

A traditional design, the grapnel is merely a shank with four or more tines. It has a benefit in that, no matter how it reaches the bottom, one or more tines will be aimed to set. In coral, or rock, it is often able to set quickly by hooking into the structure, but may be more difficult to retrieve. A grapnel is often quite light, and may have additional uses as a tool to recover gear lost overboard. Its weight also makes it relatively easy to move and carry, however its shape is generally not very compact and it may be awkward to stow unless a collapsing model is used.

Grapnels rarely have enough fluke area to develop much hold in sand, clay, or mud. It is not unknown for the anchor to foul on its own rode, or to foul the tines with refuse from the bottom, preventing it from digging in. On the other hand, it is quite possible for this anchor to find such a good hook that, without a trip line from the crown, it is impossible to retrieve.[11][12]

Herreshoff anchor

Designed by yacht designer L. Francis Herreshoff, this is essentially the same pattern as an admiralty anchor, albeit with small diamond-shaped flukes or palms. The novelty of the design lay in the means by which it could be broken down into three pieces for stowage. In use, it still presents all the issues of the admiralty pattern anchor.

Northill anchor

Originally designed as a lightweight anchor for seaplanes, this design consists of two plough-like blades mounted to a shank, with a folding stock crossing through the crown of the anchor.

CQR plough anchor

Once popular with cruising yachtsmen, the CQR anchor has been superseded by modern designs.

Many manufacturers produce a plough-type anchor, so-named after its resemblance to an agricultural plough. All such anchors are copied from the original CQR "secure", a 1933 design patented in the UK by mathematician Geoffrey Ingram Taylor.[13][14]

Plough anchors stow conveniently in a roller at the bow, and have been popular with cruising sailors and private boaters. Ploughs are generally good in all types of seafloor, though not exceptional in any. Contrary to popular belief, the CQR's hinged shank is not to allow the anchor to turn with direction changes rather than breaking out, but actually to prevent the shank's weight from disrupting the fluke's orientation while setting.[15] The hinge can wear out and may trap a sailor's fingers. Some later plough anchors have a rigid shank, such as the Lewmar's "Delta".[16]

A plough anchor has a fundamental flaw: like it namesake, the agricultural plough, it will dig in but then tends to break out back to the surface. Plough anchors sometimes have difficulty setting at all, and instead skip across the seafloor. By contrast, modern efficient anchors tend to be "spade" types that dig ever deeper.

Delta anchor

The Delta was developed in the 1980s for commercialization by British marine manufacturer Simpson–Lawrence. It is a plough anchor with a rigid, arched shank. It is described as self-launching because it can be dropped from a bow roller simply by paying out the rode, without manual assistance.

Danforth anchor

The Danforth is a light, versatile, highly popular fluke-style anchor

American Richard Danforth invented the Danforth pattern in the 1940s for use aboard landing craft. It uses a stock at the crown to which two large flat triangular flukes are attached. The stock is hinged so the flukes can orient toward the bottom (and on some designs may be adjusted for an optimal angle depending on the bottom type). Tripping palms at the crown act to tip the flukes into the seabed. The design is a burying variety, and once well set can develop high resistance. Its lightweight and compact flat design make it easy to retrieve and relatively easy to store; some anchor rollers and hawsepipes can accommodate a fluke-style anchor.

A Danforth will not usually penetrate or hold in gravel or weeds. In boulders and coral it may hold by acting as a hook. If there is much current, or if the vessel is moving while dropping the anchor, it may "kite" or "skate" over the bottom due to the large fluke area acting as a sail or wing.[17]

The FOB HP anchor designed in Brittany in the 1970s is a Danforth variant designed to give increased holding through its use of rounded flukes setting at a 30° angle.[18][19]

The Fortress is an American aluminum alloy Danforth variant which can be disassembled for storage and it features an adjustable 32° and 45° shank/fluke angle to improve holding capability in common sea bottoms such as hard sand and soft mud.[20] This anchor performed well in a 1989 US Naval Sea Systems Command (NAVSEA) test.[21] and in an August 2014 holding power test that was conducted in the soft mud bottoms of the Chesapeake Bay.[22]

Bruce or claw anchor

The Bruce anchor was an evolutionary improvement in its day. It is most effective in larger sizes

This claw-shaped anchor was designed by Peter Bruce from the Isle of Man in the 1970s.[23] Bruce gained his early reputation from the production of large-scale commercial anchors for ships and fixed installations such as oil rigs. The Bruce and its copies, known generically as "claws", have been adopted on smaller boats (partly because they stow easily on a bow roller) but they are most effective in larger sizes. It was intended to address some of the problems of the only general-purpose option then available, the plough. Claw-types do not always set quickly in most seabeds, but they have the reputation of not breaking out with tide or wind changes, instead slowly turning in the bottom to align with the force.

Bruce anchors can have difficulty penetrating weedy bottoms and grass. They offer a fairly low holding-power-to-weight ratio and generally have to be oversized to compete with newer types. On the other hand, they have a reasonable reputation in boulder seafloors, and they perform relatively well with low rode scopes. They cannot be used with hawsepipes. Many yachtsmen are abandoning the Bruce in favour of more efficient modern anchors, such as the Ultra and the Vulcan.

Recent designs

A galvanised Rocna Anchor.

In recent years there has been significant progress in anchor design. Primarily designed to set very quickly, then generate high holding power, these new generation anchors (mostly proprietary inventions still under patent) are becoming popular with users of small to medium-sized vessels.

• Bügelanker, or Wasi: This German-designed bow anchor has a sharp tip for penetrating weed, and features a roll-bar which allows the correct setting attitude to be achieved without the need for extra weight to be inserted into the tip.[24]
• Bulwagga: This is a unique design featuring three flukes instead of the usual two. It has performed well in tests by independent sources such as American boating magazine Practical Sailor.[25]
• Knox Anchor: This is produced in Scotland and was invented by Professor John Knox. It has a divided concave large area fluke arrangement and a shank in high tensile steel. A roll bar similar to the Rocna gives fast setting and a holding power of about 40 times anchor weight.[26]

Knox Anchor

• Rocna: This New Zealand spade design, available in galvanised or stainless steel, has been produced since 2004. It has a roll-bar (similar to that of the Bügel), a large spade-like fluke area, and a sharp toe for penetrating weed and grass. The Rocna sets very quickly, holds well, and has become the best-selling anchor for yachts and workboats.[27]
• Mantus: This is a fast setting anchor with high holding power, it is designed as an all round anchor capable of setting even in challenging bottoms such as hard sand/clay bottoms and grass. The shank is made out of a high tensile grade of steel capable of withstanding high loads; post-marketing reports have documented sailors who have ridden out hurricanes successfully on an appropriately sized mantus anchor. It is similar in design to the rocna but has a larger and wider roll-bar that reduces the risk of fouling and increases the aggressive angle of the fluke which results in improved penetration; it consistently outperforms older style anchors on most measures, such as CQR, Delta, Bruce/Claw and even the rocna.[28]
• Spade: This is a French design which has proved successful since 1996. It features a demountable shank (hollow in some instances) and the choice of galvanized steel, stainless steel, or aluminium construction, which means a lighter and more easily stowable anchor.[29]
• Ultra: This is an innovative spade design that dispenses with a roll-bar. Made primarily of stainless steel, its main arm is hollow, while the fluke tip has lead within it.[30]
• Vulcan: A recent sibling to the Rocna, this anchor performs similarly but does not have a roll-bar. Instead the Vulcan has patented design features such as the "V-bulb" and the "Roll Palm" that allow it to dig in deeply. The Vulcan was designed primarily for sailors who had difficulties accommodating the roll-bar Rocna on their bow.[31] Both Vulcans and Rocnas are available in galvanised steel, or in stainless steel.

Other temporary anchors

• Mud weight: Consists of a blunt heavy weight, usually cast iron or cast lead, that will sink into the mud and resist lateral movement. Suitable only for very soft silt bottoms and in mild conditions. Sizes range between 5 and 20 kg for small craft. Various designs exist and many are home produced from lead or improvised with heavy objects. This is a very commonly used method on the Norfolk Broads in England.

Permanent anchors

These are used where the vessel is permanently or semi-permanently sited, for example in the case of lightvessels or channel marker buoys. The anchor needs to hold the vessel in all weathers, including the most severe storm, but needs to be lifted only occasionally, at most – for example, only if the vessel is to be towed into port for maintenance. An alternative to using an anchor under these circumstances, especially if the anchor need never be lifted at all, may be to use a pile driven into the seabed.

Permanent anchors come in a wide range of types and have no standard form. A slab of rock with an iron staple in it to attach a chain to would serve the purpose, as would any dense object of appropriate weight (for instance, an engine block). Modern moorings may be anchored by augers, which look and act very much like oversized screws drilled into the seabed, or by barbed metal beams pounded in (or even driven in with explosives) like pilings, or by a variety of other non-mass means of getting a grip on the bottom. One method of building a mooring is to use three or more conventional anchors laid out with short lengths of chain attached to a swivel, so no matter which direction the vessel moves, one or more anchors will be aligned to resist the force.

Mushroom

Mushroom anchor on the lightship Portsmouth at Portsmouth, Virginia

The mushroom anchor is suitable where the seabed is composed of silt or fine sand. It was invented by Robert Stevenson, for use by an 82-ton converted fishing boat, Pharos, which was used as a lightvessel between 1807 and 1810 near to Bell Rock whilst the lighthouse was being constructed. It was equipped with a 1.5-ton example.

It is shaped like an inverted mushroom, the head becoming buried in the silt. A counterweight is often provided at the other end of the shank to lay it down before it becomes buried.

A mushroom anchor will normally sink in the silt to the point where it has displaced its own weight in bottom material, thus greatly increasing its holding power. These anchors are only suitable for a silt or mud bottom, since they rely upon suction and cohesion of the bottom material, which rocky or coarse sand bottoms lack. The holding power of this anchor is at best about twice its weight until it becomes buried, when it can be as much as ten times its weight.[32] They are available in sizes from about 5 kg up to several tons.

Deadweight

This is an anchor which relies solely on being a heavy weight. It is usually just a large block of concrete or stone at the end of the chain. Its holding power is defined by its weight underwater (i.e. taking its buoyancy into account) regardless of the type of seabed, although suction can increase this if it becomes buried. Consequently, deadweight anchors are used where mushroom anchors are unsuitable, for example in rock, gravel or coarse sand. An advantage of a deadweight anchor over a mushroom is that if it does become dragged, then it continues to provide its original holding force. The disadvantage of using deadweight anchors in conditions where a mushroom anchor could be used is that it needs to be around ten times the weight of the equivalent mushroom anchor.

Auger

Auger anchors can be used to anchor permanent moorings, floating docks, fish farms, etc. These anchors, which have one or more slightly pitched self-drilling threads, must be screwed into the seabed with the use of a tool, so require access to the bottom, either at low tide or by use of a diver. Hence they can be difficult to install in deep water without special equipment.

Weight for weight, augers have a higher holding than other permanent designs, and so can be cheap and relatively easily installed, although difficult to set in extremely soft mud.

High-holding-types

There is a need in the oil-and-gas industry to resist large anchoring forces when laying pipelines and for drilling vessels. These anchors are installed and removed using a support tug and pennant/pendant wire. Some examples are the Stevin range supplied by Vrijhof Ankers. Large plate anchors such as the Stevmanta are used for permanent moorings.

Anchoring gear

Thomas Brunton invented and patented in 1813 studded-link marine chain cable which replaced hempen cables and is still in use

Naval anchor incorporated into HMAS Canberra memorial, Canberra, Australia

The elements of anchoring gear include the anchor, the cable (also called a rode), the method of attaching the two together, the method of attaching the cable to the ship, charts, and a method of learning the depth of the water.

Vessels may carry a number of anchors: bower anchors (formerly known as sheet anchors ) are the main anchors used by a vessel and normally carried at the bow of the vessel. A kedge anchor is a light anchor used for warping an anchor, also known as kedging, or more commonly on yachts for mooring quickly or in benign conditions. A stream anchor, which is usually heavier than a kedge anchor, can be used for kedging or warping in addition to temporary mooring and restraining stern movement in tidal conditions or in waters where vessel movement needs to be restricted, such as rivers and channels.[33] A Killick anchor is a small, possibly improvised, anchor.[34][35]

Charts are vital to good anchoring. Knowing the location of potential dangers, as well as being useful in estimating the effects of weather and tide in the anchorage, is essential in choosing a good place to drop the hook. One can get by without referring to charts, but they are an important tool and a part of good anchoring gear, and a skilled mariner would not choose to anchor without them.

The depth of water is necessary for determining scope, which is the ratio of length of cable to the depth measured from the highest point (usually the anchor roller or bow chock) to the seabed. For example, if the water is 8 metres (26 ft) deep, and the anchor roller is 1 m (3 ft) above the water, the scope is the ratio between the amount of cable let out and 9 m (30 ft). For this reason it is important to have a reliable and accurate method of measuring the depth of water.

Anchor rode

The anchor rode (or "cable") that connects the anchor to the vessel is made up of chain, sometime with rope ("warp"). Large ships will use only chain rode, whereas, to save weight, smaller boats will use a rope/chain combination. All anchors should have some chain rode; chain is heavy but it resists abrasion from coral, sharp rocks, or shellfish beds, whereas a rope warp is susceptible to abrasion. A combination rode should be arranged so that the rope element should be suspended in the water (and not in contact with the sea bed).

Being strong and elastic, nylon rope is very suitable as an anchor warp. Polyester (Terylene) is stronger but less elastic than nylon. Both ropes sink, so they avoid fouling other craft in crowded anchorages and do not absorb much water. Neither breaks down quickly in sunlight. Polypropylene, "polyprop", is not suited to warps as it floats and is much weaker than nylon and barely stronger than natural fibres. Polyprop breaks down in sunlight and becomes hard and unpleasant to handle. Natural fibres such as manila or hemp are still used in developing nations but absorb much water, are relatively weak and rot. They do give good grip and are often very cheap.

All anchors should have chain at least equal to the boat's length. Some skippers prefer an all chain warp for added security in coral waters. Boats less than 8 m typically use 6 mm galvanized chain. 8–14 m craft use 9 mm chain and over 14 m use 12 mm chain. The chain should be shackled to the warp through a steel eye or spliced to the chain using a chain splice. The shackle pin should be securely wired. Either galvanized or stainless steel is suitable for eyes and shackles, galvanised steel being the stronger of the two. Larger yachts may add swivels to the rode. These should not be connected to the anchor itself, but should be somewhere in the chain. Most modern stainless steel swivels will pass easily over windlass gypsies and through hawseholes.

In moderate conditions the ratio of warp to water depth should be 4:1. In rougher conditions it should be up to twice this with the extra length giving more stretch to resist the anchor breaking out. There is little benefit in having a scope of more than 8:1.[36]

Anchoring techniques

Anchor winch, or windlass, on RV Polarstern

Colored plastic inserts on a modern anchor chain show the operator how much chain has been paid out. This knowledge is very important in all anchoring methods

The basic anchoring consists of determining the location, dropping the anchor, laying out the scope, setting the hook, and assessing where the vessel ends up. The ship will seek a location which is sufficiently protected; has suitable holding ground, enough depth at low tide and enough room for the boat to swing.

The location to drop the anchor should be approached from down wind or down current, whichever is stronger. As the chosen spot is approached, the vessel should be stopped or even beginning to drift back. The anchor should be lowered quickly but under control until it is on the bottom (see anchor windlass). The vessel should continue to drift back, and the cable should be veered out under control so it will be relatively straight.

Once the desired scope is laid out, the vessel should be gently forced astern, usually using the auxiliary motor but possibly by backing a sail. A hand on the anchor line may telegraph a series of jerks and jolts, indicating the anchor is dragging, or a smooth tension indicative of digging in. As the anchor begins to dig in and resist backward force, the engine may be throttled up to get a thorough set. If the anchor continues to drag, or sets after having dragged too far, it should be retrieved and moved back to the desired position (or another location chosen.)

There are techniques of anchoring to limit the swing of a vessel if the anchorage has limited room:

Using an anchor weight, kellet or sentinel

Lowering a concentrated, heavy weight down the anchor line – rope or chain – directly in front of the bow to the seabed behaves like a heavy chain rode and lowers the angle of pull on the anchor.[37] If the weight is suspended off the seabed it acts as a spring or shock absorber to dampen the sudden actions that are normally transmitted to the anchor and can cause it to dislodge and drag. In light conditions, a kellet will reduce the swing of the vessel considerably. In heavier conditions these effects disappear as the rode becomes straightened and the weight ineffective. Known as an "anchor chum weight" or "angel" in the UK.

Forked moor

Using two anchors set approximately 45° apart, or wider angles up to 90°, from the bow is a strong mooring for facing into strong winds. To set anchors in this way, first one anchor is set in the normal fashion. Then, taking in on the first cable as the boat is motored into the wind and letting slack while drifting back, a second anchor is set approximately a half-scope away from the first on a line perpendicular to the wind. After this second anchor is set, the scope on the first is taken up until the vessel is lying between the two anchors and the load is taken equally on each cable. This moor also to some degree limits the range of a vessel's swing to a narrower oval. Care should be taken that other vessels will not swing down on the boat due to the limited swing range.

Bow and stern

(Not to be mistaken with the Bahamian moor, below.) In the bow and stern technique, an anchor is set off each the bow and the stern, which can severely limit a vessel's swing range and also align it to steady wind, current or wave conditions. One method of accomplishing this moor is to set a bow anchor normally, then drop back to the limit of the bow cable (or to double the desired scope, e.g. 8:1 if the eventual scope should be 4:1, 10:1 if the eventual scope should be 5:1, etc.) to lower a stern anchor. By taking up on the bow cable the stern anchor can be set. After both anchors are set, tension is taken up on both cables to limit the swing or to align the vessel.

Bahamian moor

Similar to the above, a Bahamian moor is used to sharply limit the swing range of a vessel, but allows it to swing to a current. One of the primary characteristics of this technique is the use of a swivel as follows: the first anchor is set normally, and the vessel drops back to the limit of anchor cable. A second anchor is attached to the end of the anchor cable, and is dropped and set. A swivel is attached to the middle of the anchor cable, and the vessel connected to that.

The vessel will now swing in the middle of two anchors, which is acceptable in strong reversing currents, but a wind perpendicular to the current may break out the anchors, as they are not aligned for this load.

Backing an anchor

Also known as tandem anchoring, in this technique two anchors are deployed in line with each other, on the same rode. With the foremost anchor reducing the load on the aft-most, this technique can develop great holding power and may be appropriate in "ultimate storm" circumstances. It does not limit swinging range, and might not be suitable in some circumstances. There are complications, and the technique requires careful preparation and a level of skill and experience above that required for a single anchor.

Kedging

Statue of Peter the Great in Voronezh, Russia. He is leaning on an anchor, symbolic of his contributions to modernizing and expanding Russia's navy (1860)

Kedging or warping is a technique for moving or turning a ship by using a relatively light anchor.

In yachts, a kedge anchor is an anchor carried in addition to the main, or bower anchors, and usually stowed aft. Every yacht should carry at least two anchors – the main or bower anchor and a second lighter kedge anchor. It is used occasionally when it is necessary to limit the turning circle as the yacht swings when it is anchored, such as in a very narrow river or a deep pool in an otherwise shallow area.

For ships, a kedge may be dropped while a ship is underway, or carried out in a suitable direction by a tender or ship's boat to enable the ship to be winched off if aground or swung into a particular heading, or even to be held steady against a tidal or other stream.

Historically, it was of particular relevance to sailing warships which used them to outmaneuver opponents when the wind had dropped but might be used by any vessel in confined, shoal water to place it in a more desirable position, provided she had enough manpower.

Club hauling

Club hauling is an archaic technique. When a vessel is in a narrow channel or on a lee shore so that there is no room to tack the vessel in a conventional manner, an anchor attached to the lee quarter may be dropped from the lee bow. This is deployed when the vessel is head to wind and has lost headway. As the vessel gathers sternway the strain on the cable pivots the vessel around what is now the weather quarter turning the vessel onto the other tack. The anchor is then normally cut away, as it cannot be recovered.[38][39]

A 1914 Russian poster depicting the Triple Entente of World War I, with Britannia's association with the sea symbolized by her holding a large anchor

In heraldry

An anchor frequently appears on the flags and coats of arms of institutions involved with the sea, both naval and commercial, as well as of port cities and seacoast regions and provinces in various countries. There also exists in heraldry the "Anchored Cross", or Mariner's Cross, a stylized cross in the shape of an anchor. The symbol can be used to signify 'fresh start' or 'hope'. The New Testament refers to the Christian's hope as "an anchor of the soul" (Hebrews 6:19). In 1887, the Delta Gamma Fraternity adopted the anchor as its badge to signify hope. The Mariner's Cross is also referred to as St. Clement's Cross, in reference to the way this saint was killed (being tied to an anchor and thrown from a boat into the Black Sea in 102). Anchored crosses are occasionally a feature of coats of arms in which context they are referred to by the heraldic terms anchry or ancre.

See also

• Anchor coinage
• Anchorage (shipping)
• Digital anchor – Use of a location system and dynamic positioning control to maintain position
• Fouled anchor
• History of the anchor
• Sea anchor – A drag device used to stabilize a boat in heavy weather and reduce drift
• Sheet anchor

References

1. anchor, Oxford Dictionaries
2. ἄγκυρα, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
3. Idzikowski, Jerzy T. (2001). "Anchoring practice" (PDF).
4. "Selecting the Right Anchor". www.westmarine.com. West Marine.
5. "Seabed - where to anchor". www.sailingissues.com.
6. https://www.tc.gc.ca/en/services/marine/ports-harbours/understanding-anchorages-canada.html. Missing or empty |title= (help)
7. "About Anchors". Heavy Metal Marine.
8. G. I. Taylor. "The Holding Power of Anchors" (PDF).
9. Johnstone, Paul and McGrail, Seán (1989). The sea-craft of prehistory. London: Routledge. ISBN 978-0-415-02635-2, p.82.
10. "anchor" in The New Encyclopædia Britannica. Chicago: Encyclopædia Britannica Inc., 15th edn., 1992, Vol. 1, pp. 377–8.
11. "Grapnel anchor". AceBoater.com. Retrieved 18 May 2016.
12. "How to Choose the Right Boat Anchor Types – Active Fisherman". Active Fisherman. 2 January 2015. Retrieved 18 May 2016.
13. Taylor, G. I. (1974). "The history of an invention". Bulletin of the Institute of Mathematics and its Applications. 10: 367–368. Cited by Batchelor, G. K. (1986). "Geoffrey Ingram Taylor, 7 March 1886 – 27 June 1975". Journal of Fluid Mechanics. 173: 1–14. doi:10.1017/S0022112086001040.
14. A US patent followed in 1934 us patent 1974933, G. I. Taylor, "Anchor", issued 1934-09-25
15. http://www.petersmith.net.nz/boat-anchors/docs/cqr-plow-anchor-us-patent-1934.pdf
16. Lewmar website
17. Jim Howard; Charles J. Doane (2000). Handbook of Offshore Cruising: The Dream and Reality of Modern Ocean Cruising. Sheridan House, Inc. p. 312. ISBN 978-1-57409-093-2.
18. "Patent EP0990584A1 – Marine anchor of the flat type". google.de.
19. http://offshore.ussailing.org/Assets/Offshore/SAS+Studies/1994+anchor+test.pdf%5B%5D
20. Hallerberg, Don, U.S. Patent 5,154,133 13 October 1992
21. Witherell, P.W.: ANCHOR TEST REPORT for NINE MOVABLE-FLUKE ANCHORS (31 pounds to 200 pounds) NAVSEA Rpt. No. 835-6269039, June 1989
22. "The Fine Art of Anchoring". boatus.com.
23. Bruce, Peter, U.S. Patent 4,397,256 9 August 1983
24. Ginsberg-Klemmt, Erika & Achim, and Poiraud, Alain (2007) The Complete Anchoring Handbook, Ragged Mountain Press, ISBN 0-07-147508-7
25. Practical Sailor: "Anchor Reset Tests", Belvoir Pubs, January 2001
26. "Performance Comparison". Knox Anchors. Retrieved 10 July 2017.
27. Lowe, Colin: "Gear Test: Rocna Anchor", Boating NZ, July 2006
28. Nicholson, Darrell (13 January 2017). "An Inquiry into Anchor Angles: Comparing fluke angle and setting ability". Practical Sailor.
29. Poiraud, Alain (2003) Tout savoir sur le mouillage, Loisirs Nautiques, ISBN 2-914423-46-2
30. Ultra website
31. "Vulcan website". Archived from the original on 8 March 2019. Retrieved 7 March 2019.
32. Moorings. INAMAR. acegroup.com
33. Stream Anchor, wordnik.com
34. World Wide Words Archived 7 April 2010 at the Wayback Machine. World Wide Words (30 August 2003). Retrieved on 2013-03-30.
35. The "Pusser's Anchor". pussers.com
36. Safety in Small Craft.Ch 2. Royal NZ Coastguard Federation. Mike Scanlan. Auckland. 1994
37. Hinz, Earl R.; The Complete Book of Anchoring and Mooring, first ed., 1986, Cornell Maritime Press; ISBN 0-87033-348-8
38. Liardet, Francis (1849) Professional Recollections on Points of Seamanship Archived 29 October 2010 at the Wayback Machine, Discipline, &c.
39. General Principles of Working a Ship, from The New Practical Navigator (1814) Archived 20 August 2004 at the Wayback Machine. psych.usyd.edu.au

Bibliography

• Blackwell, Alex & Daria; Happy Hooking – the Art of Anchoring, 2008, 2011, 2019 White Seahorse; ISBN 978-1795717410
• Edwards, Fred; Sailing as a Second Language: An illustrated dictionary, 1988 Highmark Publishing; ISBN 0-87742-965-0
• Hinz, Earl R.; The Complete Book of Anchoring and Mooring, Rev. 2d ed., 1986, 1994, 2001 Cornell Maritime Press; ISBN 0-87033-539-1
• Hiscock, Eric C.; Cruising Under Sail, second edition, 1965 Oxford University Press; ISBN 0-19-217522-X
• Pardey, Lin and Larry; The Capable Cruiser; 1995 Pardey Books/Paradise Cay Publications; ISBN 0-9646036-2-4
• Rousmaniere, John; The Annapolis Book of Seamanship, 1983, 1989 Simon and Schuster; ISBN 0-671-67447-1
• Smith, Everrett; Cruising World's Guide to Seamanship: Hold me tight, 1992 New York Times Sports/Leisure Magazines

Further reading

• William N. Brady (1864). The Kedge-anchor; Or, Young Sailors' Assistant.
  • First published as The Naval Apprentice's Kedge Anchor. New York, Taylor and Clement, 1841.--The Kedge-anchor; 3rd ed. New York, 1848.--6th ed. New York, 1852.--9th ed. New York, 1857.

External links

• Anchor Tests: Soft Sand Over Hard Sand Practical-Sailor
• The Big Anchor Project
• Anchor comparison