(by Skids Trainer)

I-74 was launched in 1937 and completed in 1938, she was renumbered to I-174 in 1942;

I-75 was launched in 1936 and completed in 1938, she was renumbered to I-175 in 1942.

I-75 at commissioning ceremony.

Displacement 1,420/2,564 tons
Length 105 meters (336' 7")
Beam 8.2 meters (26' 11")
Draft 4.6 meters (15' 2")
Machinery twin shaft diesel/electric Kampon 8-cyl, 2-stroke engines
Power (diesels) 9,000 bhp
Power (electric) 1,800 ehp
Speed (diesel) 23 knots
Speed (electric) 8.2 knots
Bunkers 440 tons
Radius (diesel) 10, 000 miles @ 16 knots
Radius (electric) 65 miles @ 3 knots
Tubes (fwd) four 21 inch
Tubes (aft) two 21 inch (carried 14 torpedoes)
Guns single 12cm (4.7 inch/.40 cal deck gun
AA guns single 13mm (.51 inch) machine gun
Depth of dive 85 meters (278 feet)
Crew 68 men

These two units were slightly improved Type 6a boats with stronger gun armament and a greater depth of dive. Fuel capacity was increased by about 30 percent, making it possible for this type to travel 15,000 miles @ 10 knots. The position of the fuel tank was lowered to contribute to greater stability. I-175 sank the aircraft carrier USS LISCOMB BAY in 1943.