![]() ![]() They were armed with a single 7.62 mm (0.300 in) machine gun and sometimes an additional 12.7 mm DShK machine gun. Series 7 They weighed 14.03 tonnes (13.81 long tons 15.47 short tons) at standard load, had an overall length of 18.85 m (61.8 ft) and drew 0.6 m (2 ft 0 in) of water. 39 Series 11 boats were built beginning in 1941 and production may have continued during the war. 152 of the Series 7, 8 and 9 boats were built between 19. Production Īpproximately 300 G-5s were built. Some boats carried 82 mm (3.2 in) ROFS-82 or 132 mm (5.2 in) ROFS-132 rocket launchers in fixed mounts above and behind the wheelhouse. 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. The gun armament initially consisted of a single 7.62 mm (0.300 in) machine gun, but this was upgraded to a 12.7 mm (0.50 in) DShK machine gun in later models. 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 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. 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. However the minimum speed was 18 knots (21 mph 33 km/h) which caused a great deal of trouble when trying to moor and when maneuvering in close proximity. The initial version of the GAM-34 was less powerful than planned at only 675 bhp (503 kW) and the initial Series 7 boats could only reach 45 knots (52 mph 83 km/h). Each engine had its own transmission and drove a bronze propeller. The two engines were fitted in the forward compartment of the hull. 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 superstructure was very small to reduce top-heaviness, and crewmembers could not stand up inside it. The hull was divided into three compartments by two transverse bulkheads. ![]() 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. 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. The G-5 was a single-step, hydroplaning design with a whaleback upper hull. Unarmed, and with a partial fuel load, it achieved a maximum speed of 63.5 knots (73.1 mph 117.6 km/h) during its trials in the Black Sea during 1933 and the decision was made to place it into production. As its intended engines were not yet available two 1,000 bhp (750 kW) Isotta Fraschini engines were imported from Italy. A prototype was designed and built by TsAGI ( Russian: Центра́льный аэрогидродинами́ческий институ́т or "Tsentralniy Aerogidrodinamicheskiy Institut", the Central Aerohydrodynamic Institute) in 1932–33. It was intended to use Soviet-built engines and carry larger torpedoes than its predecessor. The G-5 class was an improved and enlarged version of the Sh-4-class motor torpedo boats which were derived from a design by Andrei Tupolev, a noted aircraft designer. 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. Four were exported to the Spanish Republican Navy during the Spanish Civil War and others were transferred to North Korea after the war. ![]() Approximately 300 were built, of which 73 were lost during the war. The G-5 was a Soviet motor torpedo boat design built before and during World War II.
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