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A PT boat (short for patrol torpedo boat) was a motor torpedo boat used by the United States Navy in World War II. It was small, fast, and inexpensive to build, valued for its maneuverability and speed but hampered at the beginning of the war by ineffective torpedoes, limited armament, and comparatively fragile construction that limited some of the variants to coastal waters. In the US Navy they were organized in Motor Torpedo Boat Squadrons (MTBRONs).Cite web |url= |title=Motor Torpedo Squadron ONE, Report for Pearl Harbor Attack, Naval History and Heritage Command |access-date=29 February 2020 |archive-date=11 August 2020 |archive-url= |url-status=dead The PT boat was very different from the first generation of torpedo boat, which had been developed at the end of the 19th century and featured a displacement hull form. These first generation torpedo boats rode low in the water, displaced up to 300 tons, and had a top speed of . During World War I Italy, the US, and UK developed the first high-performance, gasoline-powered motor torpedo boats (often with top speeds over ) and corresponding torpedo tactics, but these projects were all quickly disbanded after the Armistice. Design of World War II PT boats continued to exploit some of the advances in planing hull design borrowed from offshore powerboat racing and used multiple lightweight but more powerful marinized aircraft-derived V-12 engines, and thus were able to advance in both size and speed. During World War II, PT boats engaged enemy warships, transports, tankers, barges, and sampans. Some were converted into gunboats which could be effective against enemy small craft, especially armored barges used by the Japanese for inter-island transport. Several saw service with the Philippine Navy, where they were named "Q-boats". Primary anti-ship armament on the standard PT boat was four 21-inch Mark 8 torpedoes, each had a TNT warhead and had a range of at . Two twin .50-inch (12.7 mm) M2 Browning heavy machine guns were mounted for anti-aircraft defense and general fire support.

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