ANCHOR (Admirality Type)
Approx. Weights and Dimensions
item No Weight Dimensions mm kg A B C D ATA101 10 445 105 136 530 ATA152 15 490 120 155 615 ATA203 20 520 135 170 685 ATA304 30 565 155 192 785 ATA505 50 235 185 230 960 ATA756 75 710 210 266 1105 ATA010 100 780 230 293 1215 ATA012 125 840 245 316 1310 ATA015 150 900 265 336 1395 ATA020 200 990 290 370 1535 ATA025 250 1065 310 398 1650 ATA030 300 1105 330 423 1755 ATA040 400 1240 365 465 1936 ATA050 500 1335 390 502 2080 ATA060 600 1440 415 533 2210 ATA070 700 1500 440 560 2330 ATA080 800 1570 460 587 2435 ATA100 1000 1685 495 633 2620 ATA125 1250 1810 535 680 2825 ATA150 1500 1955 565 725 3000 ATA200 2000 2140 625 797 3300 ATA300 3000 2415 715 912 3780
¢À The measurements may vary between different factories.

PARTS OF AN ANCHOR
	1.Anchor Ring 2.Stock 3. Shank 4. Crown 5. Arm 6. Fluke 7. Bill

COMMON ANCHORS
KEDGE / ADMIRALITY Good holding power - but not for use in shallow water		DANFORTH Good holding, Easy deck stowage. Better suited for small craft
GRAPNEL For reef use.  Not suitable for general purpose in mud or sand		BRUCE Very efficient but difficult to stow on deck
CQR (PLOUGH) Good holding power but difficult to stow on deck without bow rollers		STOCKLESS Average holding power but easier stowage

ANCHOR SIZES
The anchor sizes listed below are indicative only.  Depending on the weight and vertical footprint of the vessel larger sizes than those shown may be required
WEIGHT(Kg) BOAT LENGTH (M) 4.5 5 16.8 7 9.1 8 12.3 9 13.6 10 15.9 11 20.5 13 27.3 15	BRUCE WEIGHT(Kg) BOAT LENGTH (M) 3.4 8.5 4.5 10 6.8 12 9.1 14 13.6 17	DANFORTH (SAND) WEIGHT (Kg) BOAT LENGTH (M) 1.5 3 2.7 5 3.6 6 4.5 7 5.9 8 7.3 8.5 10 9 16 10

ANCHOR CABLE
¢À Recommended specifications for anchoring gear will vary - but not by much. ¢À When in doubt use stronger and / or longer rope and chain. ¢À In open or less protected waters several anchors must be carried. BEST SYSTEM  -  Short link chain SECOND PREFERENCE  -  Rope with a length of chain pennant
Rope Properties	Connection	Chain Pennant
Nylon best Larger diameter Silver Rope Non floating	Hard eye in the rope Moused (Lock-wired) shackles	Reduces chafing on bottom Reduces shock load Increases anchor holding power
BOAT LENGTH ANCHOR ROPE CHAIN PENNANT . SIZE LENGTH SIZE LENGTH Up to 5 M 8 mm 50-70 M 6 mm 3 M 5-8 M 10 mm 75-100 M 6 mm 6 M 8-12 M 12 mm 100-125 M 6-8 mm 10 M

ANCHOR SCOPE

SEA CONDITIONS ANCHOR CABLE SCOPE ANCHOR CABLE SCOPE Favourable Chain 3 : 1 Rope 5 : 1 # Average Chain 5 : 1 Rope 8 : 1 # Rough Chain 7 : 1 Rope 10 : 1#

# The figures for Rope assume that a chain pennant of sufficient length is fitted  (See table above)

ANCHOR BUOY

¢À An anchor buoy consists of a float and line attached to the crown of the anchor.  ¢À The float must be small enough so that it exerts almost no pull on the anchor and the line long enough to allow for tidal changes - but not so long that it does not float nearly on top of the anchor. ¢À The are two reasons for having an anchor buoy.  ¢À It is useful to indicate the actual position of the anchor - especially in crowded anchorages. ¢À If the line is strong enough it can be used to help retrieve an anchor fouled in rocks or coral

ANCHOR MOORING
	¢À A mooring system deploying and using two anchors as shown in the diagrams has several advantages - swing room is considerably less and by using different types of anchors extra security is gained. ¢À Note that the swivel is essential to avoid twists and consequent fouling of the separate anchor cables. ¢À The swivel must be strong and of good quality.

ANCHORING HINTS

¢À The final dropping site should be chosen based on an assessment and knowledge of the following - Holding ground quality,  Shelter from the weather,  Swinging room,  Tidal range,  and Current flow.  ¢À Make the final approach into wind or current - whichever is likely to have the greatest effect. ¢À Ensure the anchor and cable are ready for letting go - making sure the tale of the cable is secured on board. ¢À Have the vessel going slowly astern as the anchor is let go. ¢À When the required scope is run out secure the cable and take bearings - especially abeam, to confirm that the anchor is holding. Do not stop the engine until anchor holding is confirmed. ¢À Set anchor alarms (GPS or Depth Sounder) where possible. ¢À Allocate an anchor watch - especially in areas of strong tidal current changes or significant wind changes. ¢À When in the one spot for a long time take in or let out a little cable to avoid damage at contact areas. ¢À When in deep water control the run out speed of the cable - at least until the anchor is near the bottom. ¢À Avoid anchoring near a shelf - to avoid the anchor coming off the bottom if dragged into the deep water. ¢À When recovering an anchor wash of mud before the chain / rope comes on board.  To do this easily mount some stiff scrubbing brushes on the inside of a piece of V-shaped rigid metal (Aluminium or Stainless Steel best).  Then secure the point of the V to a rigid pole of suitable length so that the brushes can be run up & down the cable at water level during the retrieval. A safety strap on the end of the pole is also useful. ¢À If the anchor is difficult to break out motor gently over the anchor and continue ahead. ¢À  AUSTRALIAN (The Marine Watch Technical Library)