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It originates from sail-powered boats and ships. Jury-rigging can be applied to any part of a ship; be it its super-structure (hull, decks), propulsion systems (mast, sails, rigging, engine, transmission, propeller), or controls (helm, rudder, centreboard, daggerboards, rigging). Similarly, a jury mast is a replacement mast after a dismasting. [2]
Most notably, the sharp V-shaped "fleet boat bow" was replaced with a distinctive rounded "Guppy bow" that improved submerged performance. [2] These modifications changed not only the boats' appearance, but also their terminology: After a GUPPY conversion, the faired structure around the boat's conning tower and mast supports was called the "sail".
If the mast has a long, thin cross-section and makes up a significant area of the airfoil, it is called a wing-mast; boats using these have a smaller sail area to compensate for the larger mast area. There are many manufacturers of modern masts for sailing yachts of all sizes, a few notable companies are Hall Spars, Offshore Spars, and Southern ...
Many mast-aft rigs utilize a small mainsail and multiple staysails that can resemble some cutter rigs. A cutter is a single masted vessel, differentiated from a sloop either by the number of staysails, with a sloop having one and a cutter more than one, or by the position of the mast, with a cutter's mast being located between 50% and 70% of the way from the aft to the front of the sailplan ...
A dismasting can also endanger lives after the mast has fallen. The reason is the broken tangle of mast, rigging, and sails usually remains attached to the vessel owing to the rigging. If waves bash a large broken mast section against a relatively thin modern hull, the entire vessel can be lost. [2]
The forestay is a wire that secures the mast to the front of the boat. With a fractional rig, the forestay is attached between about 1/8 and 1/4 of the length of the mast lower down, rather than being attached to the top of the mast as in a masthead rig. The foresail (jib or genoa) is then rigged to this stay.
This need increases in direct proportion to the wind speed and jib size. Increasing the tension on the back stay does not tend to bend the mast, as it would on a fractional sloop. It puts the mast in compression instead. For this reason the mast on a mast head rig has a thicker section at the top to stand this load.
The book includes plans for Gypsy (15' sail/oar/outboard), Nymph (7'9" dinghy with sail option), Diablo (15' motor boat for up to 25 HP outboard) as well as 8 more "traditional instant boats" using the chine log method: 16' Lug-rigger Windsprint, 6'5" Tortoise, 8' Skimmer, Dynamite Sailboard, 16'June Bug, Madeline a 19'6" Pedal-driven ...
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