The fluke style anchor more know us Danforth & Fortress style
uses a hinged stock at the crown to which two large flat surfaces
are attached. Its compact, light-weight, resistance and flat high-performance
design make it easy to retrieve and relatively easy to store.Some
hawse pipes and anchor rollers and hawse pipes can accommodate a
fluke-style anchor. The Danforth(fluke) anchor has difficulty penetrating
kelp and weedcovered bottoms, as well as rocky and particularly
clay bottoms or hard sand.
Fluke type anchors - Danforth and the Fortress
Anchors are incredibly efficient (and even a small anchor can hold
a large yachts or boats)and are designed to fall flat on the sea
bottom and no matter
which side they fall on, one of the spade-like flukes will begin
itself when a strain is taken on the anchor rode. They have large
flat flukes. The weight of the this typeis only important in ensuring
that it is large enough so it won't bend under load and that it
will begin to sink into the bottom.
Danforth anchor & characteristics
The true anchor "Danforth" is characterized by flat and
large "fluke" attached to the stock. The anchor flukes(the
flukes rotate down and begin
to penetrate the bottom) are able to rotate about 30 degree either
side of the shank.Danforth offers the greatest holding power, when
fully dug in.When a Danforth is lowered to the bottom it comes to
rest in a fla1 anchorposition or fast achieves that orientation
if it happens to land on it! the shank must be near to horizontal
or the anchor cannot take hold.
A Danforth will not normally enter or have a grawel or weeds.
Ir stones and corals, which holds as acting as a hook. In Danforth
is les: wearable on the bow roller plow. It stores a £ laskaem
plow, but a long composition often makes it difficult to manipulate
in PS a locker. Watch not to pinch your fingers between the flukes
This anchor is as well-known as the CQR or Delta and
Generally for use in small-boat , this anchor dominates the American
BM.Danforth Holding power is about 14.3 times its own weight.The
stock in this position prevents the boat anchor being fouled on its own
cable. Holding properties are very good like CQR anchor type.With
the Danforth anchor, the tripping anchor palms are situated generally
closer to the centre line of the anchor. Once tripped, the spadeshaped
flukkes will tend to dig into the seabottom. The Danforth is referred
to as the 4stock-stabil:anchor. It is also called the 'lightweight'
or the CLW
ous 'lightweight' anchors, but often when that tern Danforth.
Danforth - Lightweight Anchors
Most of the lightweight types of anchor are modeled after the original
Danforth design with long flukes provide good holding in most sea
and hard conditions and extremely hard conditions type anchor shown
pic-below (Shank, Crown, ring, fluke and stock anchor parts). This
lightweight anchor Danforth is very popular on small powerboats
or sailboats without bow rollers and can be easily stowed in a relatively
small boat space.This light type *Danforth* works best in a sandy
bottom and rock,clay or grass medium works but not quite as well
in a mud sea bottom. Because the flukes pivot, this Danforth anchor
folds flat and stows very-well.
Similar Anchor - Fortress
Similar design to the Danforth is The Fortress Anchor pic
bolow, but anchor holding power per pound is more than twice that
of the Danforth and made of a high strength aluminum magnesium alloy.rth
so cost per pound of working load is not much different.The Fortress
allows pivoting the flukes to 45degrees for mud sea bottom and 32degrees
for sand bottom thus making it more general purpose and a good choice
than the Danforth and goot for storage -the Fortress anchot can
be taken apart for storage.
"The Fortress" - ultralightweight anchor disassembled and assembled for best stowage. (right below an image)
The Fortress Tests
The easiest to stow Fortress Anchor "FX37" made of hardened aluminum magnesium
is tested that consistently quickly set, Its large sharp flukes are designed
ti dug in immediately, and held up to 5,000 pounds of load on 3:1 scope in multiple
locations and on multiple sets. As the load increases,the rode became bow-string
tight, but the lightest(only 22 pounds) Fortress didnt budge.
With its quick setting and retrieval, enormous holding power
at a variety of the ratio of the length of the height of the bow chock, 10:1
as the maximum, and easy stowability, the Fortress ranked high among all the
light weight anchors.
selection FM Anchor Guide and Videos
For general use on keel boats, yachts or vessel ,the most common anchors are
the Danforth, also this anchor is as well-known as the CQR and of equal popularity ( But the Danforth is has greater fluke and much lighter)- Plough -CQR, anchor- Bruce and the fisherman type - Admiralty.
Probably the most widely used The Danforth anchor - stock-stabilized fluke-anchor offers easy stowage, gives
it good Holding and great strength and a reasonable grip on most soft sea bottoms-beds & hard sand and hold on rocky
reefs, in coral and boulders it may hold by acting as a good-hook. using this particularly good anchor Danforth is less
convenient to carry on a bow roller than a plow and Careful Watch out not to pinch your fingers between the shank and the anchor flukes.
Danforth types Anchor and are often carried aboard trailerables as a second boat anchor because of their really very light weight.
You can carry three anchors aboard(pic below) 1 large Danforth, one small Danforth(called or the 'LWT') and
Đlow-Type Delta anchor, When You Believe that anchors are not an area for economy and spending the money to buy name-brand good Anchor proven its ability for certain anchoring conditions and very particularly bad Seastorm.
This Anchor- Danforth can be completely disassembled and stowed in a box or
small bag. These are popular secondary anchors, hut have trouble resetting
themselves if they break out after a wind or current shift. But if a strain
is taken too fast it is possible for the Danforth to skid along the bottom and
refuse to take hold - especially if the powerboat is rapidly drifting back.
A Danforth has greatest HP - large triangular flukes with a shank that pivots
- Size isn't everything when it comes to
anchors. Lightweight,small are certainly easier to store and handle and sometimes
set really better than large-size and large-weight anchors. You
can keep the small size anchor at the bow ready to go over at a moment's notice
whenever needs. Its light weight Anchor doesn't
impact the boats sailing ability as much as a large & heavier anchor would.Generally
is it better to keep heavy anchor off the very ends of the boat or yacht, (other live in the
boat cockpit locker and are brought out for example when anchoring for the night) and since trailer sailers
are by nature lighter craft, it pays to keep this rule in mind.
Problems with anchor weight have frequently Small vessels and boats especially
for Closed-bow runabouts when the boat often
runs bow-high..The greater will be the effect of shifting a few pounds aft this
boats. Ground anchor tackle is a prime candidate for weight redistribu
tion if you store an chain and anchor in a cockpit locker aft.Yes solution -
The simplest method is to attach a length of pipe PVC to a bow pulpit stanchion
with s-steel hose clamps,then the shank of anchor with anchor rode attached
into the pipe, with the flukes hanging out of the top and for Danforth anchor
- mounted on a bow pulpit of the pipe,simply lift it out of the tube and throw
it over the side to deploy the Danforth anchor, But you can have a rail mounted
bracket that fits most Danforth-stylc anchors andc holds by its flukes. Your
can choice will depend in part on which anchor provides a more convenient way
to secure the anchor shank - for pulpit railing this bracket is available in
horizontal models and for pulpit stanchion vertical.
The flat flukes or mud palms of Danforth anchor also called "plate anchors"provide
max HP (which has always been associated with Danforth )and with minimum
anchor-weight, making this trype of Ar. the most popular anchor for small size
boats. BUT when bumped those sharp fluke points
are painful and the perfect l stowage arrangement will take this into account.
On this small boat can you mounted a stanchion bracket to capture
the crown of the Danforth-anchor and then can bungeed the shank to the top of
the stanchion. Making it convenient to anchor when the leader(chain) runs aft
to the locker where stow your rope rode.
Plow Anchor and Danforth Anchor
The next traditional type is usually referred to generically as a technically
trade name "Danforth" anchor with flat, two large, triangular flukes
set directly on top of a long stock.Danforths rely primarily on their shape
for their holding power and are the lightest of the three types 25- to 40 pound
Danforth, can no problem holding a 40-foot large boat,but Danforth also are
basically unidirectional TÓĐE anchors in that they usually break out of the
sea bottom when the angle of the rode-anchor changes due to a current shift
or wind and don't easilv reset themselves.
The last popular type are very versatile 'Plow Anchor' have many models and
variations.The shape of the anchor fluke is highly variable, classic convex
triangular plows, but some are concave multipronged claws and large single central fluke,
but usually the connection is fixed and the anchor has no moving anchor elements. They
Plow Anchor called Uni-fluke are heavier than Danforth anchors but not nearly
as heavy as a fisherman, and they hold reasonably well in a wide range of environments.
They also normally reset themselves like Danforth type anchor if the angle of
pull on the anchor rode changes significantly. Some uni-flukes type anchor depend
on semicircular roll bars built onto the back of the fluke others set upright
by virtue of their shape and weight distribution.
Uni-fluke "Rocna" boat anchors are Resistant to wind and tide shifts, have 1 hig fluke with a shank coming straight off it.
This more modern Danforth variation has a roll bar to keep the anchor from lying
on its side as it sets.
The hard fold through the length of the blade provides strong reinforcement at the crucial tip,The anchor Roll-Bar ensures reinforces the blade for massive strength and correct setting attitude, all anchor types, a concave blade gives the superior Hp and
To choose the right Rocna anchor size for your vessel/yacht length on the left side on the diagram-chart above.
These photos demonstrate a standard set in hard sand. Note how
anchor sets itself within its own length. Some scope is simulated
the elevation of the towing vehicle..
These photos demonstrate a 90 degree veer while the anchor is
deliberately dragged. Note how the anchor remains embedded throughout.
The bottom is sand and shell over a hard clay substrate.
Choosing an Anchor Type- Danforth or not to Danforth Anchor
The Danforth style anchor is the usual anchor of choice for small boats -
As for anchor types, However it does not reset well your pull will switch directions
180° every six hours and this type have problem with sea grass despite these
limitations the Danforth works well. Once you dug in on the bottom, it requires
an enormous strain to pull it free if attached to sufficient scope. Yet it comes
up from the bottom easily when it is time to haul the anchor.Don't rush out
to buy something else , if you vessel is equipped with a Danforth.If you are in the
boat Market for an good anchor, consider either the CQR design and Bruce type
anchors - Both fit well on bow rollers, do a better work in seagrass variation
and keep in mind its limitations.
So most big yachts and serious use one or the other, and usually carry both
type of Anchors- Danforth and Bruce/CQR.
Dragging- In spite of your execution and excellent preparation , someday your
anchor will be drag.If you've anchored in the Seagrass or Rocky bottom
, you may be unable to get a anchor-Danforth to grab again. If it won't good
hold, you have no choice but to either start the engine or hoist sail to regain
control of your yacht or vessel. Horse Conch or Seagrass shell are stuck between
the flukes of a Danforth anchor. In other areas, it could be a coral or piece
of rock or a huge mass of seaweed. Whatever it is, clear the mass obstruction
so the anchor can work as cool-designed. Meanwhile you're drifting faster because
the anchor is not knocking along the sea bottom.
Danforth® Anchor products
Quality mrine poducts made in US (Tie Down Engineering,Atlanta)
Danforth Marine Anchors Products - Standard (Deluxe Anchor Kits),
Anchor Hi-Tensile Anchor and Chains
This anchors made of high strength steel. Each boat anchor are manufactured
with The processof hot-dip galvanizing, is the process of coating
iron with a thin zinc layer, by passing the anchor through a bath
of zinc at a hot temperature , e.g., 470°C.
Galvanized Danforth Standard & Hi-Tensile
anchors is widely used in boats where rust resistance is needed,
made from fairly strong material that stops further saltwater corrosion
in many circumstances, protecting the steel from the elements in
bad sea environment.
Anchors are warranted for the lifetime to be free from steel defects
or manufacturing process.
Danforth anchor experiments and tests
...the behaviour of anchors
Boat anchoring is more an art than a science. There are two main anchoring
aspects The first one is about how anchors behave and the forces that act on
In Test: Danforth 2,0 kg anchor test rig used a shallow tidal pool, with a firm,
The idea of anchor test is based on simple rule - to lay the anchor on the seabed,
and then drag them a distance of 5-7 metres at a constant speed. This would
establish whether an Danforth it was prone to roll-out and whether remained
vertical when pulled.
The pulley is 1 m above ground level and the cable is accurately marked at 1
The anchors which lie comfortably on a flat surface, principally the Danforth
are prone to skidding across the seabed and failing to find grip unlike the
Delta or CQR anchors , which initially lie on their sides.
The Danforth anchor merits special mention because of its remarkable figure
of 160 kg HP.
One of the most important anchor characteristics is its behaviour
when veered. When the boat pulls from another angle and the tide or wind
changes direction - It's vital the hold remains firm. Below you can see what
happens with 2 to 15 kg Danforth anchors under such conditions when veered through
For Danforth 2.0 kg Anchor:
Often the Fortress Lightweight "Danforth" style failed to rengage
after roll out when veered to port and remained buried when veered to starboard.
performing well when veered to starboard, but rolling out quickly to port.
For Danforth 6.0 kg Anchor:
Remained very stable when veered to port. When veered to starboard - the 6 kg
unit rolled to horizontal, with the stock vertical, and then rolled back to
normal position of the anchor.
This 6.0 kg version displayed a similar willingness to roll out, but to starboard.
For the heaviest Danforth 15.0 kg :
Typically the heavier Danforths performed better than lighter versions of the same type of anchors.. On veering starboard or to port, the Danforth stayed buried and regained its
hold, but the drag distance is very short. Hold of 660 kg is the max which could
be exerted by the equipment.
They do hold well in simple circumstances and roll stable in both directions.