The boat was powered by two 430 hp General Motors 12V71 diesel engines giving a top speed of 14.8 knots and it expelled its exhaust directly into the water reducing noise and smoke emissions, making it the quietest river patrol craft. The boat had a complement of five crewmen and could carry up to eight soldiers. 50 cal machine gun/ 81mm mortar in a well in the aft of the boat, but this well was eliminated in later models. 50 cal machine guns, two single M60 machine guns or Mk 21 machine guns and one Mk 2 Mod 0/1. The initial boats were armed with two Mk 48 turrets with either 20 mm cannon or. : 180 The first 36 boats were ordered from Gunderson Brothers Engineering Corporation of Portland, Oregon on 25 October 1966. The ASPB was approximately 50 feet (15 m) long, its hull was constructed of 7⁄ 32 inch (5.6 mm) steel, from the gunwale 2 inches (51 mm) up it was 1⁄ 8 inch (3.2 mm) steel, its superstructure was 1⁄ 4 inch (6.4 mm) aluminum which provided protection against 57mm recoilless rifle rounds and armor-piercing bullets up to. History ASPB on patrol during Operation Coronado IX, November 1967 The Assault Support Patrol Boat (ASPB) (also known as the Alpha Boat), was a heavily armed and armored riverine patrol boat developed by the United States Navy for use in the Vietnam War from late 1967. two single M60 machine guns or Mk 21 machine guns.two Mk 48 turrets with either 20 mm cannon or. 2 × 430hp General Motors 12V71 diesel engines
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