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Fast Patrol Craft (PCF), also known as Swift Boats, were all aluminum, 50 foot long, shallow-draft vessels operated by the United States Navy for counterinsurgency (COIN) operations during the Vietnam War. more...

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Development

The Swift Boat was conceived in a Naval Advisory Group, Military Assistance Command Vietnam (NAVADGRP MACV) staff study entitled "Naval Craft Requirements in a Counter Insurgency Environment," published 1 February 1965. It noted that "COIN water operations are difficult, demanding, and unique. A prevalent belief has been that COIN craft can readily be obtained from existing commercial and naval sources when needed. Unfortunately, no concerted effort has been made to develop COIN craft specifically suited to perform the many missions needed to combat insurgent activities."

The study went on to list characteristics of the ideal patrol craft:

Reliable and sturdy; Non-wooden hull, with screw and rudder protection against groundings; Self-sufficient for 400 to 500 mile (600 to 800 km) patrol; Speed of 20 to 25 knots (37 to 46 km/h); Small high-resolution radar range 4 to 6 miles (7 to 11 km); Reliable long-range communications equipment, compatible with Army and Air Force; Quiet; Armament for limited offense; Sparse berthing, no messing; Depth meter, accurate from 0 to 50 feet (15 m); Small, powerful searchlight;

The study was positively received, and the Navy began to search for sources. Sewart Seacraft of Berwick, Louisiana, built water taxis for companies operating oil rigs in the Gulf of Mexico, which appeared nearly ideal. The Navy bought their plans, and asked Sewart Seacraft to prepare modified drawings that included a gun tub, ammo lockers, bunks, and a small galley. The Navy used those enhanced plans to request bids from other boat builders, but Sewart Seacraft was selected.

The Swift Boats had welded aluminum hulls about 50 feet (15 m) long with 13 ft (4 m) beam, and draft of about five feet (1.5 m). They were powered by twin 480 hp (360 kW) Detroit Diesel engines with a design range from 320 nautical miles at 21 knots (590 km at 39 km/h) to about 750 nautical miles at 10 knots (1390 km at 19 km/h). Normal crew complement was one officer and five crewmen.

The first two PCFs were delivered to the Navy in late August 1965. The original water taxi design had been enhanced with two .50 caliber (12.7 mm) machine guns in a turret above the pilot house, an over-and-under .50-caliber (12.7 mm) machine gun – 81 mm mortar combination mounted on the rear deck, a mortar ammunition box on the stern, improved habitability equipment such as bunks, a refrigerator and freezer, and a sink. The 81mm combination mortar mounted on the rear deck was not a gravity firing mortar as used by the Army and Marine Corps, in which the falling projectile's primer struck the fixed firing pin at the base of the mortar tube, but a unique lanyard firing weapon in which the projectile was still loaded into the muzzle. The gunner could "fire at will" by the use of the lanyard. The weapon had been tested in the 1950s, discarded as the US Navy lost interest in the system, then it was resurrected during the war.

Read more at Wikipedia.org