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weigh half as much as the steel anchors. The greater efficiency of the aluminum anchors must be balanced against their higher cost. These anchors can penetrate deeply into the sea floor and generally produce the highest capacities of the anchor types. However, because of their tendency to roll (be unstable), it is advisable to be a little more conservative in their sizing. Very lightweight (aluminum) anchors have had problems in soft mud, because anchor crown size is insufficient to cause the flukes to rotate and to trip into the soil during drag. The new Fortress anchor design seems to have overcome this deficiency. Deep burial of these streamlined anchors can cause problems with anchor recovery, particularly in mud. These anchors are not recommended for free swinging moorings be

Table 2-19

Average Anchor Efficiency3 for Small (<200-lb) Anchors

Table 2-19

Average Anchor Efficiency3 for Small (<200-lb) Anchors

Anchor Type

Mud/Soft Clay

Sand/Stiff Clay

Bruce

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