The Taiyō was the lead ship of her class of escort carriers operated by the Imperial Japanese Navy during World War II. Originally constructed as Kasuga Maru, a passenger-cargo liner built by Mitsubishi Shipbuilding & Engineering Co. in Nagasaki, she was laid down on January 6, 1940, launched on September 19, 1940, and was intended to serve Japan Mail Shipping Line (NYK) as part of the Nitta Maru class. These ships were notable for their passenger accommodations, including the first fully air-conditioned passenger quarters on Nitta Maru. Kasuga Maru was approximately 170 meters long, with a beam of 22.5 meters and a depth of hold of 12.4 meters, registering 17,163 GRT and a cargo capacity of 11,800 tons. Powered by two geared steam turbines driving propellers via four water-tube boilers, she was rated at 25,200 shaft horsepower, capable of reaching speeds up to 22.2 knots. During her conversion to Taiyō at Sasebo Naval Arsenal in September 1941, her configuration was significantly altered into an escort carrier with a flush-deck design, displacing around 18,116 metric tons at standard load and over 20,000 tons at normal load. Her overall length increased slightly to 180.2 meters, with a flight deck of 172 meters in length and a width of 23.5 meters, capable of accommodating 23 aircraft along with a small hangar and two aircraft lifts. Armament during her service was primarily anti-aircraft, initially comprising six 12-centimeter guns, later supplemented and replaced with twin and triple 25mm AA guns, and eventually upgraded to include dual-purpose 12.7cm guns and additional 25mm mounts. She was also equipped with radar for air-search. Throughout her service, Taiyō transported aircraft to distant bases, trained naval aviators, and escorted convoys between Japan, Singapore, and other locations. She was torpedoed twice by American submarines in 1942 but survived these attacks with manageable damage. However, on August 18, 1944, while escorting a convoy near Luzon, she was hit by a torpedo from USS Rasher, which caused her aft fuel tanks to explode, leading to her sinking in about 28 minutes. Her loss was significant, with approximately 390 crew members killed, marking her as a notable vessel in Japan’s wartime naval operations and convoy escort efforts.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.