Anchor Selection Guide: Choosing an Anchor Type
This entry was posted on February 19, 2014.
There are a number of boat anchors available, constructed of different materials, and often with confusing names. This article will discuss the most popular types of boat anchors, the most common material types, and also give an overview of different naming conventions.
Quick Anchor Style Summary
Video: Choosing an Anchor Type
Our video below introduces many of the anchor types discussed here, although the article discusses a few more anchor types and gives some useful links.
Quick Summary Boat Anchor Recommendation
For most boaters, a Bruce or Delta will be the most happy balance between price and performance. All three perform similarly and are similarly priced (Narrowly, the Bruce/Claw is our favorite of the three).
If you've used a Danforth in the past, and you have had luck with it, choose a Danforth. If you've never used one before and if your setup allows it, choose a Bruce, CQR, or Delta instead.
If you're a blue-water cruiser, and you have a big wallet, consider one of the new generation of anchors.
Boat Anchor Names: Trademarked Names and Generic Names
|Trademarked Name||Generic Name|
A special note is needed on the naming of anchors. Many anchors have a trademarked name, such as a Bruce or CQR, and a generic name like Claw or Plow. This is the same as how Xerox is a trademarked name for photocopier and how aspirin is a trademarked name for pain killer. Trademarks effectively never expire whereas design patents expire after approximately 20-25 years. Therefore, manufacturers are free to clone an anchor design that has an expired patent but cannot use the trademarked name.
The Bruce, or Claw, remains one of the most popular anchors amongst recreational boaters in North America. The author is slightly biased, as this is my anchor of choice as well.
The Bruce was developed in the 70s by the Bruce Anchor Group. Once their patent expired in the early 2000s, they stopped production of this anchor but many imitations have come along since.
The Bruce is an excellent all-purpose anchor as it performs well in most sea bottoms including mud, sand, grass, rock, and coral. It sometimes has a hard time penetrating harder surfaces, such as clay. Due to the three-claw design, the Bruce often sets more easily than other anchors. It also resets easily if it is ever broken loose. On the downside, the Bruce has a lower holding power per pound than other anchors, meaning you’ll usually need a larger anchor than say the Delta/Wing.
Pros: Performs well in most conditions. Sets easily.
Cons: Awkward one piece design. Low holding power per pound.
Bottoms: Performs well in most bottoms; Struggles in hard bottoms such as clay.
Both the CQR/Plow and the Delta/Wing are a plow style anchor. The most significant difference between these anchors is the fact that the CQR has a hinged design whereas the Delta is a one piece design.
The CQR is one of the oldest styles, dating back to the 30s and to this day, it remains one of the most popular anchors amongst blue water cruisers. Despite this, it has relatively low holding power and it consistently struggles in independent tests. It’s also rare to find a CQR under 25 lbs lending itself to the saying “There’s no such thing as a small CQR”. Despite these shortcomings, the hinged design makes it more responsive to wind and tide changes as compared to other anchors.
The Delta is arguably the most popular anchor on boats today, and is the standard anchor of choice used by most boat manufacturers. It has a very reasonable holding power per pound (about 50% more than the Bruce).
Pros: Performs well in most conditions. Fits most bow rollers.
Cons: Hinged design can make stowage awkward. "No such thing as a small CQR/Plow anchor".
Bottoms: Performs well in most bottoms; Struggles in rock.
The Danforth, or Fluke anchor, remains a very popular anchor choice amongst boaters. The Fortress is also a popular Fluke style anchor, different from the Danforth in the fact that it comes apart and it constructed of light-weight, high-strength, aluminum.
The Fluke performs excellent in mud and sand, potentially the best of any anchor style. The downside is that outside of these bottoms, it does not perform at well. Therefore it is a mud/sand only anchor, which fortunately is what most bottoms are comprised of.
Whether or not it is used as a primary anchor, a Fluke anchor makes an excellent choice as a secondary anchor.
Pros: Performs well in mud and sand. Arguably the most popular general purpose anchor. Stows easily on most bow rollers.
Cons: Does not perform well outside of mud/sand.
Bottoms: Performs excellent in mud/sand. Performs poorly in other bottoms.
Plow Anchor with Roll Bar
There are several anchors on the market today which are essentially plow anchors with roll bars. These include the Rocna, Manson Supreme, and Bugel.
Each of these anchors are essentially a variation on a plow style anchor. If you look at the plow portion of these anchors, you can see they are a lot sharper than traditional plows like the Delta/Wing and CQR. Analogous to a knife through butter, these anchors can penetrate the sea bottom a lot easier than the aforementioned anchors. The roll bar also helps it orient itself upright when setting.
These anchors have performed extremely well in third party tests. The biggest downside to these anchors is that because they are still patented, they can be very expensive. The roll bar along with the elongated plow can also make storing these anchors on bow rollers difficult.
Pros: Very high holding power for many models.
Cons: Difficult to stow on a bow roller. Expense.
Bottoms: Performs well in most bottoms.
Grapnel and Other Small Craft Anchors
A Grapnel Anchor is generally used for small boats such as Kayaks, Dinghies, Canoes, etc. It’s also popular amongst fishermen.They fold up very compactly and are easy to stow. A Grapnel’s holding power comes from hooking onto another object, such as a rock. When it does hook, it can create immense holding power, which can also make retrieving the anchor difficult in such cases.
Pros: Great for use as a lunch hook. Folds to allow for compact storage.
Cons: Not appropriate for non-temporary anchorage.
Bottoms: Rock or other situations when it can hook onto an object
Mushroom anchors are amongst the most popular anchor used for permanent mooring buoys. As the silt from the sea-bottom builds up over these anchors, it can result in extreme holding power, up to 10x the holding power of its actual weight. As a mooring buoy, the mushroom anchor is an excellent choice, however, it is ineffective in most temporary anchoring situations.
Pros: Great for use for permanent mooring buoys.
Cons: Not appropriate for non-permanent moorings.
Boat Anchor Material Types
Boat anchors come in a variety of types, the most popular being mid steel, high-tensile steel, stainless steel, and aluminum.
Most of the traditional steel anchors we are accustomed to seeing are likely either mild or high tensile steel. Mild steel and high-tensile steel are nearly indistinguishable from one another appearance wise. However, high tensile steel has a holding power of 2-3x greater than mild steel. This isn't to say that a high-tensile steel boat anchor has 2-3x the holding power of its mild steel counterpart, but it will nonetheless be stronger.
Both mild steel and high-tensile steel anchors are not corrosion resistant, and therefore need to be galvanized to prevent rust and other corrosion. All steel anchors (except stainless) should be galvanized. Galvanization has a tendency to wear down over time, but an anchor anchor (as well as nearly any other steel product) can be re-galvanized.
Stainless steel is very similar to mild steel in terms of holding power but differs significantly in appearance. The shiny gloss is essentially the only difference between stainless steel and mild steel. Stainless steel is also very corrosion resistant and will resist most rusting over time. You will often see manufacturers describing stainless steel as either 316 Stainless or 304 Stainless. 316 is a different chemical composition than 304 and is more corrosion resistant. It also more expensive.
There are some anchors constructed from high strength aluminum, with Fortress anchors being the most popular of such anchors. These anchors are extremely lightweight while still offering high holding power. These anchors rely on the digging of the anchor for most of the holding power, and therefore, if they are not set, they provide little to no holding power.