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The uni knot is widely used for attaching hooks, rings and swivels to the end of the line [7] and it is also used for joining two fishing lines together. [8] The bend form of the uni knot (for joining two lines) is not a noose; rather it is akin to a multiple fisherman's knot with the two opposing knotted parts arranged in the manner of uni knots.
English inventor Francis Ronalds described what he called a propelling rudder in 1859 that combined the propulsion and steering mechanisms of a boat in a single apparatus. . The propeller was placed in a frame having an outer profile similar to a rudder and attached to a vertical shaft that allowed the device to rotate in plane while spin was transmitted to the propell
A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed first by Luigi Stipa (1931) and later by Ludwig Kort (1934). The Kort nozzle is ...
All fly lines are equipped with a leader of monofilament or fluorocarbon fishing line, usually (but not always) tapered in diameter, and referred to by the "X-size" (0X, 2X, 4X, etc.) of its final tip section, or tippet. Tippet size is usually between 0X and 8X, where 0X is the thickest diameter, and 8X is the thinnest.
However, under sail on a given tack, the corner to which the spinnaker sheet is attached is called the clew, and the corner attached to the spinnaker pole is referred to as the tack. [20] Tack – The tack is the corner on a fore-and-aft sail where the luff and foot connect [8] and, on a mainsail, is located where the boom and mast connect.
A marine thruster consists of a propeller or impeller which may be encased in some kind of tunnel or ducting that directs the flow of water to produce a resultant force intended to obtain movement in the desired direction or resist forces which would cause unwanted movement.
The ‘’tippet’’ section is a section of fishing line attached to the leader to which the artificial fly is attached. Leaders and tippets play a key role in the presentations of the fly to the fish and the subsequent landing of a fish when caught. Leaders and tippets are generally constructed of monofilament or fluorocarbon fishing line ...
Adjustable fairlead (lower right) leading to winch on sailboat Fairlead (Chock style) Three mooring lines running through fairlead on a Royal New Zealand Navy ship.. A fairlead is a turning point for running rigging like rope, chain, wire or line, that guides that line such that the "lead" is "fair", and therefore low friction and low chafe. [1]