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Japanese submarine I-46
I-46 (伊46) was the sixth Type C cruiser submarines built for the Imperial Japanese Navy. Commissioned in February 1944, she operated in World War II during the Battle of Leyte and Battle of Leyte Gulf before she was lost in October 1944. It is sometimes considered as part of a sub-class the Type C due to the various designs variations of the latter batch.
The Type C submarines were derived from the earlier Kaidai-type VI with a heavier torpedo armament for long-range attacks. They displaced 2,595 tonnes (2,554 long tons) surfaced and 3,618 tonnes (3,561 long tons) submerged. The submarines were 109.3 meters (358 ft 7 in) long, had a beam of 9.1 meters (29 ft 10 in) and a draft of 5.3 meters (17 ft 5 in). They had a diving depth of 100 meters (330 ft).
For surface running, the boats were powered by two 6,200-brake-horsepower (4,623 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 1,000-horsepower (746 kW) electric motor. They could reach 23.6 knots (43.7 km/h; 27.2 mph) on the surface and 8 knots (15 km/h; 9.2 mph) underwater. On the surface, the C1s had a range of 14,000 nautical miles (26,000 km; 16,000 mi) at 16 knots (30 km/h; 18 mph); submerged, they had a range of 60 nmi (110 km; 69 mi) at 3 knots (5.6 km/h; 3.5 mph).
The boats were armed with eight internal bow 53.3 cm (21.0 in) torpedo tubes and carried a total of 20 torpedoes. They were also armed with a single 140 mm (5.5 in)/40 deck gun and two single or twin mounts for 25 mm (1 in) Type 96 anti-aircraft guns. They were equipped to carry one Type A midget submarine aft of the conning tower.
Ordered under the Rapid Naval Armaments Supplement Programme and built by the Sasebo Naval Arsenal at Sasebo, Japan, I-46 was laid down on 21 November 1942 with the name Submarine No. 376 and was numbered I-46 on 25 May 1943. Launched on 3 June 1943 and provisionally attached to the Yokosuka Naval District, she was completed and commissioned on 29 February 1944.
Upon commissioning, I-46 formally was attached to the Yokosuka Naval District and assigned to Submarine Squadron 11 for shakedown and work-ups. During a training sortie in the Iyo-nada on 2 April 1944, she collided underwater with the submarine Ro-46 off Minase Bight southwest of Kominasa Light at 21:45, suffering damage to her conning tower and periscopes. After repairs and testing, she arrived at the Sasebo Naval Arsenal on 7 May 1944 for additional repairs.
I-46 was reassigned to Submarine Division 15 in the 6th Fleet on 30 May 1944. On 12 August 1944, her commanding officer submitted a memorandum to the headquarters of the 6th Fleet and the commander of Submarine Squadron 11 suggesting improvements to the Type 13 air search radar installation and application of the anti-radar coating aboard I-46.
On 13 October 1944, the Combined Fleet ordered the activation of Operation Shō-Gō 1, the defense of the Philippine Islands, in anticipation of an American invasion of the islands. I-46 departed Kure, Japan, to begin her first war patrol and take part in Shō-Gō 1, assigned a patrol area 120 nautical miles (220 km; 140 mi) east of Leyte in the Philippines as part of the "B" Group. Her patrol area was the westernmost of those assigned to the submarines of her group, and was adjacent to the area assigned to the submarine I-54.
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Japanese submarine I-46
I-46 (伊46) was the sixth Type C cruiser submarines built for the Imperial Japanese Navy. Commissioned in February 1944, she operated in World War II during the Battle of Leyte and Battle of Leyte Gulf before she was lost in October 1944. It is sometimes considered as part of a sub-class the Type C due to the various designs variations of the latter batch.
The Type C submarines were derived from the earlier Kaidai-type VI with a heavier torpedo armament for long-range attacks. They displaced 2,595 tonnes (2,554 long tons) surfaced and 3,618 tonnes (3,561 long tons) submerged. The submarines were 109.3 meters (358 ft 7 in) long, had a beam of 9.1 meters (29 ft 10 in) and a draft of 5.3 meters (17 ft 5 in). They had a diving depth of 100 meters (330 ft).
For surface running, the boats were powered by two 6,200-brake-horsepower (4,623 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 1,000-horsepower (746 kW) electric motor. They could reach 23.6 knots (43.7 km/h; 27.2 mph) on the surface and 8 knots (15 km/h; 9.2 mph) underwater. On the surface, the C1s had a range of 14,000 nautical miles (26,000 km; 16,000 mi) at 16 knots (30 km/h; 18 mph); submerged, they had a range of 60 nmi (110 km; 69 mi) at 3 knots (5.6 km/h; 3.5 mph).
The boats were armed with eight internal bow 53.3 cm (21.0 in) torpedo tubes and carried a total of 20 torpedoes. They were also armed with a single 140 mm (5.5 in)/40 deck gun and two single or twin mounts for 25 mm (1 in) Type 96 anti-aircraft guns. They were equipped to carry one Type A midget submarine aft of the conning tower.
Ordered under the Rapid Naval Armaments Supplement Programme and built by the Sasebo Naval Arsenal at Sasebo, Japan, I-46 was laid down on 21 November 1942 with the name Submarine No. 376 and was numbered I-46 on 25 May 1943. Launched on 3 June 1943 and provisionally attached to the Yokosuka Naval District, she was completed and commissioned on 29 February 1944.
Upon commissioning, I-46 formally was attached to the Yokosuka Naval District and assigned to Submarine Squadron 11 for shakedown and work-ups. During a training sortie in the Iyo-nada on 2 April 1944, she collided underwater with the submarine Ro-46 off Minase Bight southwest of Kominasa Light at 21:45, suffering damage to her conning tower and periscopes. After repairs and testing, she arrived at the Sasebo Naval Arsenal on 7 May 1944 for additional repairs.
I-46 was reassigned to Submarine Division 15 in the 6th Fleet on 30 May 1944. On 12 August 1944, her commanding officer submitted a memorandum to the headquarters of the 6th Fleet and the commander of Submarine Squadron 11 suggesting improvements to the Type 13 air search radar installation and application of the anti-radar coating aboard I-46.
On 13 October 1944, the Combined Fleet ordered the activation of Operation Shō-Gō 1, the defense of the Philippine Islands, in anticipation of an American invasion of the islands. I-46 departed Kure, Japan, to begin her first war patrol and take part in Shō-Gō 1, assigned a patrol area 120 nautical miles (220 km; 140 mi) east of Leyte in the Philippines as part of the "B" Group. Her patrol area was the westernmost of those assigned to the submarines of her group, and was adjacent to the area assigned to the submarine I-54.