Anatomy of an Anchor
To get an idea of how each anchor type works we must know each of its parts and functions. The shank is the stem of the anchor in which direction is pulled to set (bury) the anchor. The crown connects the assorted parts of the modern anchor. The stock turns the anchor into an attitude that enables the flukes to dig into the sea bed. The optional tripping ring is used for tripping with a cut off line, allowing the anchor to break out. The flukes will be buried into the seabed. The very tip of a fluke is sometimes called the bill.
Traditional Types of anchor
There are 6 main types of anchor. They are the Fisherman, the Claw or Bruce, the Plow or Plough, The Fluke, the Grapnel and Mushroom. Each of these families has many anchors that quote to the basic develop principle. For example the Plow type named because it acts like a farmers plow, has the Cqr and Delta which belong to this anchor family.
Fisherman
Fluke
The fisherman is a former develop and is often seen on the bows of old navigation Ships like Hms Victory. The develop is a non-burying type of maritime anchor, and grabs rocks with one arm penetrating the seabed and the other standing proud. It has a good reputation for use in rock, kelp, and grass. However its keeping power to weight ratio is among the worst of all anchor types. The former frailness of the anchor develop is its capability to foul the cable over changing tides. One of the Fishermans arms can catch the anchor Rhode or cable and accidentally trip the anchor. It is difficult to cope and bring aboard without scarring the topsides and does not stow well in an anchor roller.
The Fisherman is best qualified for rocks, and kelp bottoms, but not good keeping in sand or mud. The Fisherman has arms which lodges themselves in a rock bed, or as in grass and kelp, the arms allow the anchor to penetrate through the kelp.
Modern examples of fisherman type anchors include; Luke Storm Anchor, kedge and Navy.
Bruce/Claw
The Bruce anchor was designed by Peter Bruce back in the 1970s. The Bruce also known as the Claw. Claw-types set speedily in most sea beds and although not an articulated design, they have the reputation of not breaking out with pull direction, instead gradually turning in the bottom to align with the force. They offer a fairly low keeping power to weight ratio and commonly have to be over-sized to compete with other types. On the other hand they achieve relatively well with low rode scopes and set fairly reliably. The former Claw anchor has rounded flukes. The Claw Anchor showed poor performance in the many anchor tests, which are attributed to the anchor failing to dig in, due to the rounded flukes. The Rocna Spade and consummate anchors faired much best and many anchor tests. The Rocna Spade and consummate anchors and are among a new breed of anchor with roll bars and/or pointed tips.
Claw anchors are best qualified for sand and muddy bottoms where the develop can dig in. Claw types boat anchors have difficulty penetrating weedy bottoms and grass, tending to float over weed and kelp rather than digging in.
Modern examples of claw type anchors include; Bruce, Claw, Rocna, Spade, and Supreme
Plow or Plough
The plows keeping power over a wide collection of bottom types, makes it a top selection of cruising boaters, named for its similarity to the farmers plow. When dropped in the water, a plow often lands on its side. However when pulled by the ground tackle, the Plow buries itself. Its shape allows it to reset fairly unmistakably should the wind or tide shift the boat position. Many manufacturers produce a plough-style design, all based on or direct copies of the former Cqr the Coastal Quick Release. The Cqr develop has a hinged shank, allowing the anchor to turn with direction changes rather than breaking out, and also arranged to force the point of the plough into the bottom if the anchor when it lands on its side. The more recent Delta uses an unhinged shank and a plough with definite angles to develop slightly superior performance. Owing to the use of lead or other dedicated tip-weight, the plough is heavier than midpoint for the whole of resistance developed, and may take a slightly longer pull to set thoroughly.
Recommended for bottom surface; Works well on many bottom surface types. Sand, mud, and kelp grass.
Modern examples of Plow type anchors include; Delta, Cqr Plow or Plough
Fluke
The fluke style anchor, named due to its large flukes, uses a stock at the crown to which two large flat surfaces are attached. The stock is hinged so the flukes can orient toward the bottom (on some designs the flukes angle can be optimized depending on the bottom type.) The develop is a burying variety, and once well set can develop an astonishing whole of resistance. Its light weight and contract flat develop make it easy to retrieve and relatively easy to store; some anchor rollers and hawse pipes can adapt a fluke-style anchor. A few high-performance designs are available, such as the Fortress, which are lighter in weight for a given area and in tests have shown best than midpoint results. Once set, the fluke anchor tends to break out and reset when the direction of force changes dramatically, such as with the changing tide, and on some occasions it might not reset but instead drag.
The fluke is recommended for sand and muddy bottom surfaces. The fluke anchor has difficulty penetrating kelp and weed-covered bottoms, as well as rocky and particularly hard sand or clay bottoms. If there is much current or the vessel is bright while dropping the anchor it may float over the bottom due to the large fluke area acting as a wing.
Examples of Fluke Anchor types; Fortress Danforth and Guardian
Grapnel
The grapnel style is uncomplicated to develop and build. The develop is a non-burying variety, with one or more tines digging in and the remainder above the seabed. In coral it is often able to set speedily by hooking into the structure. A grapnel is often quite light, and used aboard smaller boats where its weight makes it relatively easy to bring aboard. The Grapnel is sometimes difficult to retrieve
Grapnels rarely have adequate fluke area to develop much hold in sand, clay, or mud. It is not unknown for the anchor to foul on its own rode, like the fisherman, or to foul the tines with refuse from the bottom, preventing it from digging in. It is quite inherent for this anchor to find such a good hook that, without a trip line, it is impossible to retrieve.
Mushroom Anchors
Mushroom anchors work best in soft muddy bottoms, where they can originate suction which can be difficult to break. Recommended for small boats to use as a lunch hook, but not practical for larger boats.
Conclusion
I read somewhere a question from a new boater who asked if they needed an anchor. The write back is yes you do its required by law in many places and it can be one of the first pieces of accident equipment you'll need. Whether you sail up a river, or cross oceans an anchor is an necessary piece of gear.
When selecting which anchor is best for you, think the foremost factors are reliability to set, keeping power, veering and damage/storing. Which bottom surface do you need your anchor to work in? How big a boat are you operating? Are you fishing or riding out a storm?
This report will give you a guide to the assorted types of anchor old and new. Which types of anchor work in which bottom surface, is foremost to you. The good news is that the newer anchor technology appears to be working and from the anchor tests we looked at the new designs outperformed the tradition types.
In part 2 of anchoring, we supply information on ground tackle & anchoring techniques to help you stay anchored in bright conditions.
Friends Link : Automobuy Store
No comments:
Post a Comment