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One of the ships in Borobudur depicting a double-outrigger vessel with fore-and-aft tanja sails on tripod masts (c. 8th century AD) Main articles: Crab claw sail and Tanja sail The fore-and-aft rig is believed to have been developed independently by the Austronesian peoples some time after 1500 BC with the invention of the crab claw sail .
Rigging of an asymmetrical scaffolding piece: the lifting beam is blue, the load is attached to the beam using grey slings. The lifting beam (also known as traverse, spreader beam) is a steel beam that is attached to the hook of the crane in order to spread the slings from one end of an elongated load (like a wall panel) to another.
It may have also caused the unique development of outrigger boat technology due to the necessity for stability once crab claw sails were attached to small watercraft. [3] Crab claw sails can be used for double-canoe , single-outrigger (on the windward side), or double-outrigger boat configurations, in addition to monohulls. [4] [5]
A modern container crane capable of lifting two 20-foot (6.1 m) long containers at once (end to end) under the telescopic spreader will generally have a rated lifting capacity of 65 tonnes. Some new cranes have a 120-tonne load capacity, enabling them to lift up to four 20-foot (6.1 m) or two 40-foot (12 m) containers.
Outriggers are used to level and stabilize the crane for hoisting. [56] These telescopic cranes are single-engine machines, with the same engine powering the undercarriage and the crane, similar to a crawler crane. The engine is usually mounted in the undercarriage rather than in the upper, as with crawler crane.
Catamarans and single-outrigger canoes are the traditional configurations in Polynesia, Micronesia, and Madagascar. In the Pacific Islands, a single outrigger float is called an ama. It is connected to the main hull by spars called ʻiako , ʻiato , or kiato . The ama, which is usually rigged on the left side, provides stability.
A container spreader is a tool used for lifting containers and unitized cargo. The spreader is placed between the container and the lifting machine. [1]The spreader used for containers has a locking mechanism at each corner that attaches to the four corners of the container.
The apparent wind on the sail creates a total aerodynamic force, which may be resolved into drag, the force component in the direction of the apparent wind and lift, the force component normal (90°) to the apparent wind. Depending on the alignment of the sail with the apparent wind, lift or drag may be the predominant propulsive component.
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