prahu

The English word proa derives from the Malay prahu (also spelled perahu), the generic Malay term for a boat or vessel. Prahu is one of the most commonly used words in Malay nautical vocabulary and has a wide semantic range — it can refer to any small to medium-sized watercraft, from a simple dugout canoe to an elaborate trading vessel. The word's origin is Austronesian, shared across the language family that spread from Taiwan throughout the Pacific and Indian Oceans over thousands of years: cognate forms appear in Old Javanese, Tagalog, and many other Austronesian languages. In European usage, proa became more specifically associated with the flying proa — the fast single-outrigger sailing canoe of the Mariana Islands (Guam and Saipan) and Micronesia, which European sailors encountered in the seventeenth century and recognized immediately as a vessel unlike anything in their experience.

The Chamorro flying proa of the Marianas was a technological achievement of the first order. The vessel consisted of a narrow, asymmetric main hull with a single outrigger float on the windward side, connected by booms. The proa always kept the outrigger to windward, so it sailed in both directions without tacking — instead of turning the bow through the wind, the proa reversed direction by swapping bow and stern, a maneuver called shunting. This meant the proa never had to tack (which requires momentarily losing speed as the bow crosses the wind) and could maintain maximum speed in both directions. Spanish and Dutch accounts from the seventeenth century describe flying proas traveling at speeds of 20 to 25 knots — extraordinary for any vessel under sail — and being effectively uncatchable by European ships. The Chamorro people of the Marianas had developed, over centuries of ocean navigation, the fastest sailing hull form of the pre-industrial world.

European contact with the proa in the Marianas is documented from Ferdinand Magellan's circumnavigation (1521), during which his fleet was surrounded by hundreds of outrigger craft whose speed astonished the Spanish sailors. The islands were briefly named the 'Ladrones' (Islands of Thieves) before being renamed the Mariana Islands under Spanish colonization in 1668; the flying proa was one of the central technologies of Chamorro culture and their oceanic navigation. As Spanish colonization suppressed Chamorro culture from the 1670s onward — including organized resistance crushed in the Spanish-Chamorro wars — the flying proa tradition was disrupted, though it never entirely died. European and American sailors continued to report the vessel's extraordinary speed throughout the eighteenth and nineteenth centuries.

The proa's design principles — asymmetric hull, outrigger stabilization, shunting instead of tacking — were recognized by Western naval architects as potentially applicable to high-performance sailing. In the twentieth century, proa-inspired designs began influencing experimental and competitive sailboat design. The modern performance multihull, the racing catamaran, and particularly the asymmetric proa design entered competitive sailing in the late twentieth century. The America's Cup, sailing's oldest international trophy, was won in 2010 and 2013 by catamaran-based designs that drew on the same principles of outrigger stabilization the Chamorro sailors had developed centuries earlier. The word proa entered English permanently through the logbooks and accounts of seventeenth-century Pacific navigation and has remained the technical term for the Austronesian single-outrigger vessel form.