The simplest form of all ancestral Austronesian boats had five parts. The bottom part consists of a single piece of hollowed-out log. At the sides were two planks, and two horseshoe-shaped wood pieces formed the prow and stern. These were fitted tightly together edge-to-edge by sewing or with dowels inserted into holes in between, and then lashed to each other with ropes (made from rattan or fibre) wrapped around protruding lugs on the planks. This characteristic and ancient Austronesian boatbuilding practice is known as the "lashed-lug" technique. They were commonly caulked with pastes made from various plants as well as tapa bark and fibres which would expand when wet, further tightening joints and making the hull watertight. They formed the shell of the boat, which was then reinforced by horizontal ribs. Shipwrecks of Austronesian ships can be identified from this construction, as well as the absence of metal nails. Austronesian ships traditionally had no central rudders but were instead steered using an oar on one side.[8][9][10]
They also independently developed various sail types during the Neolithic, beginning with the crab claw sail (also misleadingly called the "oceanic lateen" or the "oceanic sprit") at around 1500 BCE. They are used throughout the range of the Austronesian Expansion, from Maritime Southeast Asia, to Micronesia, Island Melanesia, Polynesia, and Madagascar. Crab claw sails are rigged fore-and-aft and can be tilted and rotated relative to the wind. They evolved from V-shaped perpendicular square sails in which the two spars converge at the base of the hull. The simplest form of the crab claw sail (also with the widest distribution) is composed of a triangular sail supported by two light spars (sometimes erroneously called "sprits") on each side. They were originally mastless, and the entire assembly was taken down when the sails were lowered.[11]
There are several distinct types of crab claw rigs, but unlike western rigs, they do not have fixed conventional names.[12] Crab claw sails are rigged fore-and-aft and can be tilted and rotated relative to the wind. They evolved from V-shaped perpendicular square sails in which the two spars converge at the base of the hull. The simplest form of the crab claw sail (also with the widest distribution) is composed of a triangular sail supported by two light spars (sometimes erroneously called "sprits") on each side. They were originally mastless, and the entire assembly was taken down when the sails were lowered.[11]
The need to propel larger and more heavily laden boats led to the increase in vertical sail. However this introduced more instability to the vessels. In addition to the unique invention of outriggers to solve this, the sails were also leaned backwards and the converging point moved further forward on the hull. This new configuration required a loose "prop" in the middle of the hull to hold the spars up, as well as rope supports on the windward side. This allowed more sail area (and thus more power) while keeping the center of effort low and thus making the boats more stable. The prop was later converted into fixed or removable canted masts where the spars of the sails were actually suspended by a halyard from the masthead. This type of sail is most refined in Micronesian proas which could reach very high speeds. These configurations are sometimes known as the "crane sprit" or the "crane spritsail".[11][12]
Micronesian, Island Melanesian, and Polynesian single-outrigger vessels also used the canted mast configuration to uniquely develop shunting.[11][12] In shunting vessels, both ends are alike, and the boat is sailed in either direction, but it has a fixed leeward side and a windward side. The boat is shunted from beam reach to beam reach to change direction, with the wind over the side, a low-force procedure. The bottom corner of the crab claw sail is moved to the other end, which becomes the bow as the boat sets off back the way it came. The mast usually hinges, adjusting the rake or angle of the mast. The crab claw configuration used on these vessels is a low-stress rig, which can be built with simple tools and low-tech materials, but it is extremely fast. On a beam reach, it may be the fastest simple rig.
Another evolution of the basic crab claw sail is the conversion of the upper spar into a fixed mast. In Polynesia, this gave the sail more height while also making it narrower, giving it a shape reminiscent of crab pincers (hence "crab claw" sail). This was also usually accompanied by the lower spar becoming more curved.[11][12]
Taumako single-outrigger tepukei, an example of the basic mastless crab claw sail
The conversion of the prop to a fixed mast in the crab claw sail led to the much later invention of the tanja sail (also known variously and misleadingly as the canted square sail, canted rectangular sail, boomed lugsail, or balance lugsail). Tanja sails were rigged similarly to crab claw sails and also had spars on both the head and the foot of the sails; but they were square or rectangular with the spars not converging into a point.[11][12] They are generally mounted on one or two (rarely three or more) bipod or tripod masts, usually made from thick bamboo.[13][14][15] The masts have curved heads with grooves for attaching the halyards. The lower part of two of the bamboo poles of the mast assembly have holes that are fitted unto the ends of a cross-wise length of timber on the deck, functioning like a hinge. The forward part of the mast assembly had a forelock. By unlocking it, the mast can be lowered across the ship.[13]
Despite the similarity of its appearance to western square rigs, the tanja is a fore-and-aft rig similar to a lugsail. The sail was suspended from the upper spar ("yard"), while the lower spar functioned like a boom.[13] When set fore-and-aft, the spars extend forward of the mast by about a third of their lengths. When running before the wind, they are set perpendicular to the hull, similar to a square rig.[16] The sail can be rotated around the mast (lessening the need for steering with the rudders) and tilted to move the center of pull forward or aft. The sail can even be tilted completely horizontally, becoming wing-like, to lift the bow above incoming waves. The sail is reefed by rolling it around the lower spar.[13]
In addition to the tanja sails, ships with the tanja rigs also have bowsprits set with a quadrilateral headsail, sometimes also canted as depicted in the Borobudur ships.[16] In the colonial era, these were replaced by triangular western-style jibs (often several in later periods), and the tanja sails themselves were slowly replaced with western rigs like gaff rigs.[13]
^Doran, Edwin B. (1981). Wangka: Austronesian Canoe Origins. Texas A&M University Press. ISBN 9780890961070.
^Pierron, Denis; Razafindrazaka, Harilanto; Pagani, Luca; Ricaut, François-Xavier; Antao, Tiago; Capredon, Mélanie; Sambo, Clément; Radimilahy, Chantal; Rakotoarisoa, Jean-Aimé; Blench, Roger M.; Letellier, Thierry (2014-01-21). "Genome-wide evidence of Austronesian–Bantu admixture and cultural reversion in a hunter-gatherer group of Madagascar". Proceedings of the National Academy of Sciences. 111 (3): 936–941. Bibcode:2014PNAS..111..936P. doi:10.1073/pnas.1321860111. ISSN 0027-8424. PMC 3903192. PMID 24395773.
^Doran, Edwin Jr. (1974). "Outrigger Ages". The Journal of the Polynesian Society. 83 (2): 130–140.
^Mahdi, Waruno (1999). "The Dispersal of Austronesian boat forms in the Indian Ocean". In Blench, Roger; Spriggs, Matthew (eds.). Archaeology and Language III: Artefacts languages, and texts. One World Archaeology. Vol. 34. Routledge. pp. 144–179. ISBN 978-0-415-10054-0.
^Bellwood, Peter; Fox, James J.; Tryon, Darrell (2006). The Austronesians: Historical and Comparative Perspectives. Australian National University Press. ISBN 978-1-920942-85-4.
^Bellwood, Peter (2014). The Global Prehistory of Human Migration. p. 213.
^Bellina, Bérénice (2014). "Southeast Asia and the Early Maritime Silk Road". In Guy, John (ed.). Lost Kingdoms of Early Southeast Asia: Hindu-Buddhist Sculpture 5th to 8th century. Yale University Press. pp. 22–25. ISBN 978-1-58839-524-5.
^ a bHorridge A (2008). "Origins and Relationships of Pacific Canoes and Rigs" (PDF). In Di Piazza A, Pearthree E (eds.). Canoes of the Grand Ocean. BAR International Series 1802. Archaeopress. ISBN 9781407302898. Archived (PDF) from the original on 26 July 2020. Retrieved 22 October 2019.
^ a bLacsina, Ligaya (2016). Examining pre-colonial Southeast Asian boatbuilding: An archaeological study of the Butuan Boats and the use of edge-joined planking in local and regional construction techniques (PhD). Flinders University.
^Heng, Derek (2018). "Ships, Shipwrecks, and Archaeological Recoveries as Sources of Southeast Asian History". In Ludden, David (ed.). Oxford Research Encyclopedia of Asian History. doi:10.1093/acrefore/9780190277727.013.97. ISBN 978-0-19-027772-7.
^ a b c d e fCampbell, I.C. (1995). "The Lateen Sail in World History". Journal of World History. 6 (1): 1–23. JSTOR 20078617.
^ a b c d eHorridge, Adrian (April 1986). "The Evolution of Pacific Canoe Rigs". The Journal of Pacific History. 21 (2): 83–99. doi:10.1080/00223348608572530. JSTOR 25168892.
^ a b c d ePelras, Christian (1997). The Bugis. John Wiley & Sons. pp. 258–259. ISBN 9780631172314.
^Burningham, Nick (2019). "Shipping of the Indian Ocean World". In Schottenhammer, Angela (ed.). Early global interconnectivity across the Indian Ocean world. Volume 2: Exchange of ideas, religions, and technologies. Palgrave Macmillan. pp. 141–202. ISBN 9783319978017.
^Chaudhuri, K.N. (1985). Trade and Civilisation in the Indian Ocean: An Economic History from the Rise of Islam to 1750. Cambridge University Press. p. 152. ISBN 9780521285421.
^ a bPaine, Lincoln (2013). The Sea and Civilization: A Maritime History of the World. Knopf Doubleday Publishing Group. p. 286. ISBN 9780307962256.
^ a bTu, Karen Kan-Lun (2017). Wa and Tatala: The Transformation of Indigenous Canoes on Yap and Orchid Island (PDF) (PhD).