How to select the proper line diameter for your anchor
The rule of thumb is 1/8" of rope diameter for every
nine feet of boat length. Round up to the nearest multiple
of 9. So if your boat is 25 feet, you need 3/8" anchor
line. If your boat is 30 feet, you should select 1/2"
Another way to select your line size is by working loads.
The working loads are derived from wind loads on your boat.
To determine cordage size for your boat, consult the wind
loading and nylon cordage charts.
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.
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 ANCshank.
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 -
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
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.
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
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 between them.
- 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
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
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 greatest resistance
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.
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.
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 an Danforth's.
In Test: Danforth 2,0 kg anchor test rig used a shallow tidal pool,
with a firm, sandy bottom.
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 m intervals.
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 90°.
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
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