Design
The design for Suma was based on an all-steel, double-bottomed hull, with an armored deck, divided underneath by watertight bulkheads. Her armor covered only vital areas, such as the boilers, gun magazines and critical machinery, with a thickness of 25 millimetres (0.98 in) on the deck. Her main battery consisted of two QF 6 inch /40 naval guns, one set in the forecastle and one in the stern. The main guns had a range of up to 9,100 metres (9.1×1012 nm) with a nominal firing rate of 5.7 shots/minute. Secondary armament consisted of six QF 4.7 inch Gun Mk I–IV mounted in sponsons on the upper deck. These guns had a range of up to 9,000 metres (9.0×1012 nm) with a nominal firing rate of 12 shots/minute. She also had ten QF 3 pounder Hotchkiss guns, with a range of up to 6,000 metres (6.0×1012 nm) with a nominal firing rate of 20 shots/minute, mounted four on the upper deck, two on the poop, two on the after bridge and one each on the bow and stern, as well as four 1-inch Nordenfelt gun, which was later replaced by four 7.62 mm Maxim machine guns. She also was equipped with two 356-mm torpedoes, mounted on the deck.
Her powerplant consisted of two vertical triple expansion steam engines, with eight cylindrical boilers in two boiler rooms separated by a watertight bulkhead. When completed, the ship was found to have stability problems, and her fighting tops were later removed to lower her center of gravity.
Read more about this topic: Japanese Cruiser Suma
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