วันศุกร์ที่ 16 ตุลาคม พ.ศ. 2552

Age of sail


The term "frigate" (Italian: fregata; Spanish/Catalan/Portuguese/Sicilian: fragata; Dutch: "fregat") originated in the Mediterranean in the late 15th century, referring to a lighter galleass type ship with oars, sails and a light armament, built for speed and maneuverability.[1]

In 1583, during the Eighty Years' War, Habsburg Spain recovered the Southern Netherlands from the rebellious Dutch. This soon led to the occupied ports being used as bases for privateers, the Dunkirkers, to attack the shipping of the Dutch and their allies. To achieve this they developed small, maneuverable, sail-only vessels that came to be referred to as frigates. Because most regular navies required ships of greater endurance than the Dunkirker frigates could provide, the useful term 'frigate' was soon applied less exclusively to any relatively fast and elegant sail-only ship, such that much later even the mighty English Sovereign of the Seas was described as 'a delicate frigate' after modifications in 1651[citation needed].

The navy of the Dutch Republic was the first regular navy to build the larger ocean-going frigates. The Dutch navy had three principal tasks in the struggle against Spain: to protect Dutch merchant ships at sea, to blockade the ports of Spanish-held Flanders to damage trade and halt enemy privateering, and to fight the Spanish fleet and prevent troop landings. The first two tasks required speed, shallowness of draft for the shallow waters around the Netherlands, and the ability to carry sufficient supplies to maintain a blockade. The third task required heavy armament, sufficient to fight against the Spanish fleet. The first of these larger battle-capable frigates were built around 1600 at Hoorn in Holland.[2] By the later stages of the Eighty Years War the Dutch had switched entirely from the heavier ships still used by the English and Spanish to the lighter frigates, carrying around 40 guns and weighing around 300 tons.

The effectiveness of the Dutch frigates became most visible in the Battle of the Downs in 1639, triggering most other navies, especially the English, to adopt similar innovations.

The fleets built by the Commonwealth of England in the 1650s generally consisted of ships described as 'frigates', the largest of which were two-decker 'great frigates' of the third rate. Carrying 60 guns, these vessels were as big and capable as 'great ships' of the time; however, most other frigates at the time were used as 'cruisers': independent fast ships. The term 'frigate' implied a long hull design, which relates directly to speed (see hull speed) and also, in turn, helped the development of the broadside tactic in naval warfare.

At this time a further design evolved, reintroducing oars to create the galley frigate such as the Charles Galley of 1676 which was rated as a 32 gun fifth rate but also had a bank of 40 oars set below the upper deck which could be used to propel the ship in the absence of a favourable wind.

In French, the term 'frigate' became a verb, meaning 'to build long and low', and an adjective, adding further confusion. [3]

Under the rating system of the Royal Navy, by the middle of the 18th century, the term 'frigate' was technically restricted to single-decked ships of the fifth rate, though small 28-gun frigates were classed as sixth rate.[1]

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