Aikoku Maru and Hokoku Maru
Dutch tanker Ondina
Part of the Hokoku Maru-class ocean liners ordered by the Osaka Mercantile Steamships Company Limited or Osaka Shosen Kaisha (O.S.K. Lines) on 17 May 1937 to be used of the Japan-Africa line, consisting of the Hokoku Maru, Aikoku Maru and Kokoky Maru (later renamed in Gokoku Maru).
Common technical class specifications. With a displacement of 7.520 tons and as dimensions 160,8 (over all) x 20,1 x 12,5 metres or 527.7 x 65.11 x 31.0 feet. The machinery consisted of 2 Mitsui-B&W Model 12-62 VF-115 diesels supplying 13.000 (cruising)-19.427 (maximum) bhp. Speed 20,9 knots. Their crew numbered 1500 men with accommodation for 400 passengers and 12.000 cubic metres cargo hold capacity. Armament consisted of 8-14cm L/50 naval guns, 4-2,5cm anti aircraft guns and 4-53,3cm/21.0” torpedo tubes. Carried 2 Kawanashi E7K aircraft in 1941, replaced in 1942 by Aichi E13A.