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Clewlines (green) and buntlines (red) for a single sail. The sail here is semi-transparent; fainter lines are running behind it. Clewlines and buntlines are lines used to handle the sails of a square rigged ship. The leechlines are clearly visible running inwards and upwards from the edges of the sail.
A polar diagram, or polar plot, is a graph that shows a sailboat's potential speed over a range of wind speeds and relative wind angles. [1] It normally consists of the right side of a line chart with the radius representing the yacht speed and the angle representing the wind direction blowing from top to bottom. Several lines are normally ...
To calculate on a portolan chart the course to follow from a point of origin to a point of destination, one should transfer — using a parallel rule — the "line of course" drawn from the point of origin to the point of destination, on top of the windrose line on the compass rose closest to the ship's position, obtaining on it the theoretical course to be followed when sailing towards the ...
A sail plan is a drawing of a sailing craft, viewed from the side, depicting its sails, the spars that carry them and some of the rigging that supports the rig. [1] By extension, "sail plan" describes the arrangement of sails on a craft. [2] [3] A sailing craft may be waterborne (a ship or boat), an iceboat, or a sail-powered land vehicle.
J&J Design is a naval architecture, design, boat and production-process engineering company, mainly for high-volume production sail and powerboat builders. It introduced the carbon-epoxy technology from the America's Cup into cruising sailboats with the Shipman line. J&J also designed and engineered the first serial production hybrid powerboats ...
[6] [9] On a given sail, the net aerodynamic force on the sail is located approximately at the maximum draught intersecting the camber of the sail and passing through a plane intersecting the centre of effort, normal to the leading edge (luff), roughly perpendicular to the chord of the sail (a straight line between the leading edge (luff) and ...
Waterline of a ship. The mark above the waterline indicates the Plimsoll line. The waterline is the line where the hull of a ship meets the surface of the water.. A waterline can also refer to any line on a ship's hull that is parallel to the water's surface when the ship is afloat in a level trimmed position.
Blue safety line tied off to the red jackline with clip. A jackline is also a rope installed in the luff of a mainsail to allow the luff slides to migrate horizontally away from the mast when the sail is reefed. By allowing the slides to migrate, more space is left in the mast track for the upper luff slides to descend, making the operation easier.