The "STEALTH" Anchor - "What A GRIP"!
quick set, non-fouling, easy release

E-Mail: hans@hansanchor.com

Telefon: 727-688-5944 Tollfree: 727-565-1355 Europe: +46-31-360-8811

 



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HANS Anchor, Inc.
2727 6th Ave. S., St. Petersburg
FL 33712, USA
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Copyright  2002 ,
Last modified:
01/29/09
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Illustrated Techniques...
The "STEALTH" Anchor 
 Click on picture below for enlargement.

1.  Description
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The Plowshare type, and symmetrically designed diamond shaped anchor, is constructed of two broad, arrow-shaped flukes beveled along the edges and joined at the open end of the arrows.  The shank is hinged at the center of the crown, centerpiece, which has two pointed bills, designed to withstand great tension. Only one bill is performing at a time.
 
3.  GRIP position
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The GRIP position, standing on three points: the tip of the shank, on one of the fluke wings and the tip of the forward aimed bill. The pressure of the bill is approximate 55% of the anchors total weight that allows fast action to set in any type of seabed. See # 11.


 
5.  Added weight
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When penetrating deep, bottom material accumulates on top of the upper fluke and thereby adding weight to the anchor, which helps for an even deeper penetration.
 
7.  The flukes
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All fluke surfaces are aims in the same direction of penetration and when completely embedded these surfaces also compresses the bottom material for a strong hold. A completely balanced hold provides for a total stability in the seabed with no tendency to break out.
 
9.  Angle of GRIP
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The grip angle in the GRIP position is approximate 38, which decreases to about 31 when cutting through the seabed. When using the angle adjustment bolt, this reduces above angles with approximately 10, for a  sharper cut.
 
11.  GRIP sequence in the seabed:
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A) The GRIP position. See # 3.
B) The pointed bill penetrates immediately with ease.
C) The fluke tip plow cuts into the seabed like a scissors.
D) Most of the flukes are embedded.
E) Digging deeper to a horizontally balanced hold.
F) When completely buried the anchor cuts into more dense bottom material.  See # 3 & 4, also "Techniques".
 
13.  Fluke areas and one pointed bill
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The large fluke surface retains a strong holding power, particularly when lower and upper flukes are embedded.
 
 
15.  EASY TO RECOVER
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The fluke design makes the break out from the seabed easy while rotating when hoisted. The grounding power lies in the back at the widest part of the anchor where also the axis of rotation is located, behind the breakpoint. See #14.
 
17.  Performance on rock and stone
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The performance on rough rocky seabed is unique. Its arrow-shaped flukes (stock) continuously steer the extended, forward pointing, bill in a steady GRIP position however the anchor slides and turn around upon the rocky bottom.
 
19.  360 veering with wind and current
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One of the greatest benefits is the 360 veering ability, sideways rotating, without fouling or loosing its hold. This due to the bill that sits deep in the seabed, making the anchor rotates around this. When veering the anchor tilts slightly to one or the other side, like a banking airplane, while still cutting through the seabed. The acting force on the centerpiece makes it turn horizontally balanced while fighting and remaining imbedded until hoisted.
 
21.  Releasing 1. (from cables, pipes etc.)
HCA Techill-21a.jpg (30218 bytes) If caught on a taut line, pipe or other underground objects, releasing the anchor is relatively easy by letting out more scope and pulling the anchor tight and around approximately 70 or more in either direction. The outer
. fluke part then catches and acts as a new pivot point, which will release the bill.
 
23.  Releasing 3. (from a mooring line)
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Freeing the anchor from a foreign mooring line or cable is easy. When resistance occurs from the object, let the anchor go, preferably 1-2 meters (4-6 feet) above the bottom and the anchor then swing out and away from the object, leaving it free to be hoisted. If NOT successful the first time, try a second time!
 
25.  Releasing 5. (with a trip-line)
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Mooring in a known difficult rocky bottom, wreckage... etc. a trip-line should be used to save your anchor.  The anchor comes with a trip-line attachment hole in the back of the crown. With the cable wired to the ring, it is important to make sure the anchor crown can move freely. Use only this method in a well-planned
mooring in fair wind. In stronger winds, this method can be fatal, making the anchor useless. NEVER use this method for permanent or over night anchorage. Any vessel must be attended at all time when moored in heavy weather conditions.
 
27.  Backing the anchor
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We recommend backing your main anchor to gain greater holding power and security, when exposed to rough weather conditions.  Use this method only for NON shifting winds.
 
29.  When used as a drag anchor
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A rare quality is using the anchor as a drag anchor, by using a shorter scope, 1.5:1 to 2:1ratio. Motored at low speed the anchor rakes the bottom, withstanding high tension from occasionally snagging the bottom and finally catching the cable or net... etc.
 
31.  Anchor marker
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To show the position of the anchor when moored is sometimes very important especially, where many yachts moor together. Showed arrangement is practical as it always shows exact and it compensates for tidal currents.
 
33.  Cleaning the anchor by towing it
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Cleaning the anchor by towing it at a speed of ~1.2 knots is very effective. The water then lifts the flukes as shown the lower bill retracts into the shank, preventing it from catching foreign objects. The anchor follows the boat without jerking.
 
35.  Stowing possibilities
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Stows in several practical ways:
1) Bow anchor on the stem-head roller
2) Standing secured on its crown, holding chain and line ideally. Lay the chain around the extended bill.
3) Hang deep and secure over the push pit. The durable HANS-Bag comes with drainage holes and a protective 1" polyethylene tube that stretches the bag sides apart.
4) Pulled onto a horizontal bar, platform... etc.
Secure the anchor firmly when NOT in use.
 
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2.  Landing on the seabed
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The anchor always lands on one of its four sides. When pulled it flips up to the GRIP position within ~1- 2 times its length ready to penetrate the seabed. This quick action comes from the relatively short length of the fluke, bill, and the momentum-developed form the distance hinge to the bottom.
 
4.  Horizontally balanced
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The anchor becomes quickly horizontally balanced, when pulled from the GRIP position, because bottom material acts with a force onto the bill, centerpiece. When perfectly balanced NO forces act on either side of the bill. See # 11.
 
6.  No fouling
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The design eliminates virtually any possibility, for foreign objects; to foul the embedded anchor therefore considered as NON-fouling anchor.
 
 
8.  Involved penetrating forces
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- Gravity forces, 
- Momentum forces hinged well above bottom. 
- Friction forces against the bottom material when pulled.
- Compression forces generated   between the flukes. 
- Veering forces, from wind, current and wave actions.
Working together above force makes the anchor set quickly.
 
10.  Performing angle changes
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When the upper fluke is embedded as well, the counteracting forces from both flukes join just under the shank and the anchor is completely balanced. This sharp cut in the seabed makes the anchor not break  out and therefore superior to most other anchors. The denser bottom the stronger hold!
 
12.  Beveled edges
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The beveled flukes optimize the penetration ability.




 
14.  Angle adjustment bolt
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The grip angle reduces when inserting a bolt in the angle adjustment hole in the shank. The break point changes from the tip of the fluke to the bolt against the
bill ideally used for larger scope ratios as 10:1 or more, in a distress situation. Use NO adjustment bolt by normal anchoring.
 
16.  Forces of momentum when hoisting
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The applied vertical, hoisting, force is approximate 8 - 15 times less than the forces of momentum in the bottom material. This makes it much easier to release then most other anchors. 
 
18.  Catching on stones
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The extended pointed bill gets an exceptional strong hold on rocks and stony bottoms. The design of the flukes generates a strong hold when performing in soft
bottoms.
 
20.  Superior strength
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High sideways forces can be applied as the upper bill is retracted into and supporting the shank. This excellent feature allows the anchor to take care of almost any situation by itself. Unless anchor is jammed among rocks as in picture #18 shows. See above.
 
22.  Releasing 2. (from rock)
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If caught on a rocky edge, cleft, coral... etc the best method to release the anchor is to moving the boat to a point just above the anchor and then try to shake it lose. In softer rocks as limestone and corals, it then works itself out to be free. To save the corals this is defiantly the only method!  See #21.
 
24.  Releasing 4. (with a chaser)
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Use a chaser or chain to free the anchor from a difficult situation. A 60 cm. (2 feet) long heavy chain is ideal to use sliding it down over the cable and then retracting the fouled anchor.
 
26.  Anchoring in seaweed
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Let the anchor go with a free fall to the bottom. The anchor then falls with the shank down and with high speed it penetrates into the soft seabed underneath the seaweed.  Let out a scope of 5:1, applying any force to the cable and let just the wind and wave actions set the anchor for a secure hold.  Do NOT power set the anchor unless the captain decides otherwise.
 
28.  Scope
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An adequate scope ratio (length of cable, from anchor to the bow and depth, bottom to the bow) is essential. Never use less then a minimum scope of 3 times (3:1) and increase the scope as weather conditions worsen. See "Selection Guide."
 
30.  Permanent anchoring
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Lowered, hanging perfectly horizontally (in the ring and the trip-line hole), to an exact predestinated location, it sets itself ready to be pulled into the seabed. This mooring technique is ideal for securing various vessels in harbors, at shoreline moorings and for permanent buoys.
 
32.  Cleaning the anchor manually
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If filled with clay it is best cleaned by simply lifting it out of the water and dropped back again. The impact force will loosen and eliminate most of any remaining debris.
 


 
34.  Lifting the anchor on board
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When hoisting turn the extended and aggressive bill away from the boat's freeboard, to avoid any contact that can damage the hull.
 

 
36.  The HANS Bag
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The HANS Bag allows an extremely practical and convenient way to stow the mooring gear. It saves valuable storage space, and makes it always quickly accessible when needed. The Bag hangs on the inside of the push pit along with HANS, 5-7Kg. /11-15Lb, working anchor on the outside. When hoisting the anchor, drop the line simply into the bag as it comes and when let go the line just runs out as it lies. When the anchor is not used The Bag lid hooked onto the  anchor holds it down, when not used. It also protects the mooring line from UV-rays. See #35.
 
37.  Handling
HCA Techill-35.jpg (35316 bytes) A safe way to carry and handle the anchor is by gripping it around the retracted bill and the shank with the extended bill turned away from your body