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2. Anchor - Wikipedia

   en.wikipedia.org/wiki/Anchor

   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]

3. History of the anchor - Wikipedia

   en.wikipedia.org/wiki/History_of_the_Anchor

   Bruce Anchor Co has its primary role in the very large anchor business, producing mooring anchors and permanent installation types for heavy industry, such as oilrigs. On the back of this reputation, the Bruce small boat anchor type was initially very successful, and represented some significant improvements over the CQR. It is no longer produced.

4. Boat building - Wikipedia

   en.wikipedia.org/wiki/Boat_building

   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.

5. Marine propulsion - Wikipedia

   en.wikipedia.org/wiki/Marine_propulsion

   Marine propellers are also known as "screws". There are many variations of marine screw systems, including twin, contra-rotating, controllable-pitch, and nozzle-style screws. While smaller vessels tend to have a single screw, even very large ships such as tankers, container ships and bulk carriers may have single screws for reasons of fuel ...

6. Mooring - Wikipedia

   en.wikipedia.org/wiki/Mooring

   For a small boat (e.g. 22' / 6.7 m sailing yacht), this might consist of a heavy weight on the seabed, a 12 mm or 14 mm rising chain attached to the "anchor", and a bridle made from 20 mm nylon rope, steel cable, or a 16 mm combination steel wire material. The heavy weight (anchor) should be a dense material.

7. Anchor (disambiguation) - Wikipedia

   en.wikipedia.org/wiki/Anchor_(disambiguation)

   Anchor, part of a microdermal implant in body modification; Anchor escapement, a type of escapement used in pendulum clocks; Screw anchor, to secure a screw in a brittle material; Boat anchor (metaphor), a colloquial term for outdated equipment; Digital anchor, uses GPS and electronic compass to hold a boat's position