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The first release was in November 1969 and it saw continued development into the 1980s, including a commercial derivative, MAINSAIL. SAIL's main feature is a symbolic data system based upon an associative store based on LEAP by Jerry Feldman and Paul Rovner. Items may be stored as unordered sets or as associations (triples).
CH2M Hill offices at the Parkside Tower in Salt Lake City, Utah (2013) The former VECO building, now CH2M Hill's Alaska headquarters (2011). CH2M, earlier CH2M Hill, was an engineering company that provided consulting, design, construction, and operations services for corporations and governments.
Washington Group International was an American corporation which provided integrated engineering, construction, and management services to businesses and governments around the world. Based in Boise, Idaho , WGI had approximately 25,000 employees working in over 40 US states and more than 30 countries.
A mainsail may also be furled by a similar system, whereby the sail is furled within the mast or around a rotating boom (or around a rotating shaft within a boom). Although staysail roller-furling is effective and very common, in-mast or in-boom mainsail furling involves some compromises, and mainsail slab reefing gives a better sail shape.
In 2016, Englewood, Colorado-based IHS and London-based Markit merged. [5] [6] Jerre Stead was chief executive of the pre-merger IHS Inc. from 2006 to 2013 and from 2015 until the merger with Markit. [2]
The overall effect of tensioning the running backstay is a shallower mainsail (less camber) combined with a reduction in headsail sag. If the running backstays lead to the mast where the forestay attaches, the effect of tensioning them is to reduce sag in the headsail, increase mast bend, and flatten the mainsail as a result.
Artemon, along with mainsail and topsail, developed into the standard rig of seagoing vessels in imperial times, complemented by a mizzen on the largest freighters. [8] Throughout antiquity , both foresail and mizzen remained secondary in terms of canvas size, but still large enough to require full running rigging . [ 8 ]
Fractional rigs were introduced on race boats in order to allow more controllability of the surface of the mainsail and also less drag when sailing upwind. According to one manufacturer, "a key to making fast boats easier to sail than slow boats is the 'fractional rig'". [1]