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Japanese submarine Ro-46
Ro-46 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in February 1944, she served in World War II, including operations related to the Marianas campaign, the Philippines campaign, and the Battle of Okinawa. She disappeared in April 1945 during her fifth war patrol.
The submarines of the K6 sub-class were versions of the preceding K5 sub-class with greater range and diving depth. They displaced 1,133 tonnes (1,115 long tons) surfaced and 1,470 tonnes (1,447 long tons) submerged. The submarines were 80.5 meters (264 ft 1 in) long, had a beam of 7 meters (23 ft 0 in) and a draft of 4.07 meters (13 ft 4 in). They had a diving depth of 80 meters (260 ft).
For surface running, the boats were powered by two 2,100-brake-horsepower (1,566 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 600-horsepower (447 kW) electric motor. They could reach 19.75 knots (36.58 km/h; 22.73 mph) on the surface and 8 knots (15 km/h; 9.2 mph) underwater. On the surface, the K6s had a range of 11,000 nautical miles (20,000 km; 13,000 mi) at 12 knots (22 km/h; 14 mph); submerged, they had a range of 45 nmi (83 km; 52 mi) at 5 knots (9.3 km/h; 5.8 mph).
The boats were armed with four internal bow 53.3 cm (21.0 in) torpedo tubes and carried a total of ten torpedoes. They were also armed with a single 76.2 mm (3.00 in) L/40 anti-aircraft gun and two single 25 mm (1.0 in) AA guns.
Ro-46 was laid down as Submarine No. 387 on 13 June 1942 by Mitsubishi Heavy Industries at Kobe, Japan. She was renamed Ro-46 on 5 February 1943 and was attached provisionally to the Maizuru Naval District that day. She was launched on 23 May 1943 and was completed and commissioned on 19 February 1944.
Upon commissioning, Ro-46 was attached formally to the Maizuru Naval District. She called at Tokuyama to refuel from 28 to 29 March 1944. During a workup cruise, she was involved in an underwater collision with the submarine I-46 in the Iyo-nada in the Seto Inland Sea off Minase Light at 21:45 on 2 April 1944, suffering damage to her conning tower.
On 23 June 1944, Ro-46 was reassigned to Submarine Division 34 in the 6th Fleet, and she departed Kure, Japan, to begin her first war patrol, assigned a patrol area in the Mariana Islands off Saipan, where the Battle of Saipan had been raging since 15 June. U.S. forces attacked and damaged her on 3 July 1944, forcing her to return to Kure on 8 July 1944 for repairs.
With her repairs complete, Ro-46 set out from Kure on 19 September 1944 to begin her second war patrol, assigned a patrol area southwest of Palau. She sighted a United States Navy aircraft carrier on 28 September 1944, but was too far away to attack. She sighted another aircraft carrier on 1 October 1944, but again did not attack.
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Japanese submarine Ro-46
Ro-46 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in February 1944, she served in World War II, including operations related to the Marianas campaign, the Philippines campaign, and the Battle of Okinawa. She disappeared in April 1945 during her fifth war patrol.
The submarines of the K6 sub-class were versions of the preceding K5 sub-class with greater range and diving depth. They displaced 1,133 tonnes (1,115 long tons) surfaced and 1,470 tonnes (1,447 long tons) submerged. The submarines were 80.5 meters (264 ft 1 in) long, had a beam of 7 meters (23 ft 0 in) and a draft of 4.07 meters (13 ft 4 in). They had a diving depth of 80 meters (260 ft).
For surface running, the boats were powered by two 2,100-brake-horsepower (1,566 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 600-horsepower (447 kW) electric motor. They could reach 19.75 knots (36.58 km/h; 22.73 mph) on the surface and 8 knots (15 km/h; 9.2 mph) underwater. On the surface, the K6s had a range of 11,000 nautical miles (20,000 km; 13,000 mi) at 12 knots (22 km/h; 14 mph); submerged, they had a range of 45 nmi (83 km; 52 mi) at 5 knots (9.3 km/h; 5.8 mph).
The boats were armed with four internal bow 53.3 cm (21.0 in) torpedo tubes and carried a total of ten torpedoes. They were also armed with a single 76.2 mm (3.00 in) L/40 anti-aircraft gun and two single 25 mm (1.0 in) AA guns.
Ro-46 was laid down as Submarine No. 387 on 13 June 1942 by Mitsubishi Heavy Industries at Kobe, Japan. She was renamed Ro-46 on 5 February 1943 and was attached provisionally to the Maizuru Naval District that day. She was launched on 23 May 1943 and was completed and commissioned on 19 February 1944.
Upon commissioning, Ro-46 was attached formally to the Maizuru Naval District. She called at Tokuyama to refuel from 28 to 29 March 1944. During a workup cruise, she was involved in an underwater collision with the submarine I-46 in the Iyo-nada in the Seto Inland Sea off Minase Light at 21:45 on 2 April 1944, suffering damage to her conning tower.
On 23 June 1944, Ro-46 was reassigned to Submarine Division 34 in the 6th Fleet, and she departed Kure, Japan, to begin her first war patrol, assigned a patrol area in the Mariana Islands off Saipan, where the Battle of Saipan had been raging since 15 June. U.S. forces attacked and damaged her on 3 July 1944, forcing her to return to Kure on 8 July 1944 for repairs.
With her repairs complete, Ro-46 set out from Kure on 19 September 1944 to begin her second war patrol, assigned a patrol area southwest of Palau. She sighted a United States Navy aircraft carrier on 28 September 1944, but was too far away to attack. She sighted another aircraft carrier on 1 October 1944, but again did not attack.