Tobiuo (Flying Fish) -along with her sister Ajisashi- was Koko's next step into quickly building a respectable carrier force in the years preceding WWII. Designed in parallel with the larger fleet carriers of the Umineko class, Tobiuo's design evoved from that of the preceding Ahodori. Tobiuo was longer, beamier, with a deeper draft, a bulbous bow and two full length hangars that would have allowed to carry (theoretically) up to 50 aircrafts (only achiavable through embarking a questionable airwing made just of Nakajima B5Ns). Tobiuo was officially budgeted as a submarine tender named Same (Shark) - like her sister Ajisashi was under the false name Tako (Octopus)- as to hide from enemy intelligence the true number of aicraft carriers Koko no Kaigun was building.
Built at Yamatogawa, Tobiuo was laid down in December 1937, launched in 1939 and commissioned in late January 1942.
Tobiuo was initially deployed to the Aleutians, then briefly to Singapore in May 1942 before returning north in late June. She then served in the Solomon theater between late 1942 and early 1944 before being recalled for upgrades to her electronincs, airplanes and armament. After that, she took part in multiple skirimishes and battles along the northern Hawaiian islands until her sinking at the hands of US carrier-aircrafts in September 1944.
Tobiuo specifications as commissioned (1942):
-Displacement: 14.964 t standard, 17.012 t full load
-Length, overall: 230,19m (756ft)
-Length, hull: 228,21m (749,50ft)
-Length, waterline: 223,03m (732,49ft)
-beam, maximum (outrigger platforms): 41,87m (137,51ft)
-beam, waterline: 19,94m (65,49ft)
-beam, hull: 20,80m (68,31ft)
-mean draft: 7,20m (23,65ft)
-Machinery: 8x Oil firing boilers, 4x geared steam turbines, 140.000 shp, 4 shafts
-Speed: 34 kts
-Range: 9.200nm at 14 kts
-Armour: deck 35mm (1.4''), magazines 70mm (2.7''), torpedo bulkhead 25mm (1'', protective internal bulge 1m on each side)
-Armament: 8x 127mm/40 DP guns (4x2, 400rpg), 30x 25mm/60 AA-MGs (10x3, 9.000rpg)
-Electronics: Standard RDF
Flight deck, hangar and airwing:
-Flight deck length: 227,91m (748,51ft)
-Flight deck width: 24,82m (81,52ft)
-Equipment: 6x arrestor wires, 2x crash barrers, 1x wind break
-Upper hangar: 151,7m (498,22ft) long, 14,1/18,3m (46,31/60,10ft) wide, 5,3m (17,41ft) tall
-Lower hangar: 150,1m (492,97ft) long, 12,6/15,4m (41,38/50,58ft) wide, 5,3m (17,41ft) tall
-Forward elevator: 12,03 x 13,55m (39,51 x 44,50ft)
-Aft elevator: 11,72 x 13,85 m (38,49 x 45,49ft)
-Airwing: 45+3 aircrafts (17+1 A6M fighters, 18+1 B5N torpedo bombers, 10+1 D3A dive bombers) - 45 operational + 3 disassembled spares on the lower hangar.