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G-5 class motor torpedo boat : ウィキペディア英語版
G-5-class motor torpedo boat

The G-5 was a Soviet motor torpedo boat built before and during World War II. Approximately 300 were built, of which 73 were lost during the war. Four were exported to the Spanish Republican Navy during the Spanish Civil War and others were transferred to North Korea after the war. Three were captured by the Finns, but only two were used before all three had to be returned to the Soviets after the Moscow Armistice in 1944.
==Design and development==
The G-5 class was an improved and enlarged version of the s which were derived from a design by Andrei Tupolev, the noted aircraft designer. It was intended to use Soviet-built engines and carry larger torpedoes than its predecessor. A prototype was designed and built by TsAGI ((ロシア語:Центра́льный аэрогидродинами́ческий институ́т) or "Tsentralniy Aerogidrodinamicheskiy Institut", the Central Aerohydrodynamic Institute) in 1932–33. As its intended engines were not yet available two Isotta-Fraschini engines were imported from Italy. Unarmed, and with a partial fuel load, it achieved a maximum speed of during its trials in the Black Sea during 1933 and the decision was made to place it into production.〔Breyer, p. 196〕
The G-5 was a single-step, hydroplaning design with a whaleback upper hull. It was mainly built from duralumin which saved a significant amount of weight, but greatly complicated its use in service because of duralumin's susceptibility to galvanic corrosion in salt water. One captured Soviet torpedo boat commander said that G-5s could only be kept in the water for 5–7 days during the summer and 10–15 days during the winter before it had to be removed from the water and treated with anti-corrosion measures. The hull was divided into three compartments by two transverse bulkheads. The superstructure was very small to reduce top-heaviness, and crewmembers could not stand up inside it.〔Breyer, pp. 196–97〕
The G-5 was designed to use a version of the Mikulin AM-34 aircraft engine adapted for maritime use as the GAM-34. The two engines were fitted in the forward compartment of the hull. Each engine had its own transmission and drove a bronze propeller in diameter. The initial version of the GAM-34 was less powerful than planned at only and the initial Series 7 boats could only reach . However the minimum speed was which caused a great deal of trouble when trying to moor and when maneuvering in close proximity.〔Breyer, p. 197〕
The two torpedoes were carried in troughs set into the rear deck in a manner derived from that used by the British WW I-era coastal motor boats captured by the Soviets during Russian Civil War. The torpedoes were shoved out the back of the trough by an arbor with a bell-shaped head that was activated by an explosive charge, but the torpedo motor was not activated until a wire trailing from the boat snapped, giving the boat time to turn away from the target.〔Bryer, pp. 279–80〕 This launching system was very light, but it required additional training to properly aim the torpedo and prior coordination when making massed torpedo attacks to prevent the boats from ramming each other or the torpedoes.〔
The gun armament initially consisted of a single machine gun, but this was upgraded to a DShK machine gun in later models. Some later boats carried two DShKs although the mounts varied; some were placed in a tub in the forecastle, but others carried theirs in a rotating turret behind the superstructure, above the torpedoes.〔Breyer, pp. 197–201〕 Some boats carried ROFS-82 or ROFS-132 rocket launchers in fixed mounts above and behind the wheelhouse.〔Conway's, p. 342〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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