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Anchor: a device for holding a boat to the seabed, typically with chain and rope. Traditional anchors include the fisherman, Danforth, and plough types (such as the "CQR" and "Delta"). Recently, far more effective anchors with more reliable holding include the "Rocna" and the "Ultra", both of which are spade anchors.
The net is set on the bottom, or at a distance above it and held in place with anchors or weights on both ends. By adjusting the design these nets can fish in surface layers, in mid water or at the bottom, targeting pelagic, demersal or benthic species. On small boats gillnets are handled by hand. Larger boats use hydraulic net haulers or net ...
Holding ground is the area of sea floor that holds an anchor, and thus the attached ship or boat. [4] Different types of anchor are designed to hold in different types of holding ground. [5] Some bottom materials hold better than others; for instance, hard sand holds well, shell holds poorly. [6] Holding ground may be fouled with obstacles. [6]
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The anchor must be adequate to resist the maximum tensile load of the guy wires; both the dead load of the tension of the wire and the maximum possible live load due to wind. Since the guy wire exerts its force at an angle, the anchor has both vertical and lateral (horizontal) forces on it.
Full-scale field tests were performed in water at depths of up to 1,000 metres (3,300 ft) using a 12-metre (39 ft) long, 762-millimetre (30.0 in) diameter, torpedo anchor with a dry weight of 400 kilonewtons (90,000 lb f). The torpedo anchor dropped from a height of 30 metres (98 ft) above sea level achieved 29-metre (95 ft) penetration in ...
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