Imperial Japanese Navy submarine I-168
The Japanese Kaidai Types were based on the World War-I German U-139 submarine design. The Imperial Japanese Submarine I-168 was a KD6A type, faster than their predecessors, the KD5 type; these boats had the highest surface speed of any submarines in the world in the mid-1930s, although their speed was surpassed slightly by later Japanese boats.
The boat was originally numbered I-68, but was renumbered in 1942.
These boats were quite successful. I-168 finished off the damaged USS Yorktown, airplane carrier, on 7 June 1942, also sinking USS Hammann, destroyer, with the same spread of torpedoes.
Specifications, I-168, Type KD6A:
Displacement (srf/sub tons): 1,785/2,440
Dimensions (L*B*D feet): 343`6*27`0*15`0
Propulsion: 2*4,500hp diesel engines, 2*900hp electric motors, 2 shafts
Speed (srf/sub knots): 23/8.25
Range (srf/sub n/miles@knots): 14,000@10/un known
Diving depth (feet): 250
Complement: 70 officers and crew
Torpedo: 4*21" (533mm) bow torpedo tubes, 2*21" aft torpedo tubes, total of 14 torpedoes
Armament: 1*100mm/65cal. Main deck gun
A total of 8 units were constructed under this type all completed between 1934 to 38. I-168 to I-173 of the KD6A type, I-174 and I-175 represent the KD6B type, and were about one foot (30cm) longer and 25 tons heavier than shown in the table. Their range is stated as 10,000 n/miles@16 knots. They, along with I-171, I-172, and I-173, received the 120 mm/50 cal. instead of the 100 mm weapon shown in the table. None survived the war.
Back to History Index
||Battle of Midway, Yorktown and Hammann torpedoed by Japanese sub I-168