HMS Spark (pennant number P236) was a S-class submarine of the third batch built for the Royal Navy during World War II. She survived the war and was scrapped in 1950.
The third batch was slightly enlarged and improved over the preceding second batch of the S-class. The submarines had a length of 217feet overall, a beam of 23feet and a draft of 14feet. They displaced 842LT on the surface and 990LT submerged.[1] The S-class submarines had a crew of 48 officers and ratings. They had a diving depth of 300feet.[2]
For surface running, the boats were powered by two 9500NaN0 diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 650hp electric motor. They could reach 15kn on the surface and underwater.[3] On the surface, the third batch boats had a range of 6000nmi at and 120nmi at submerged.[2]
The boats were armed with seven 21 inch (533 mm) torpedo tubes. A half-dozen of these were in the bow and there was one external tube in the stern. They carried six reload torpedoes for the bow tubes for a grand total of thirteen torpedoes. Twelve mines could be carried in lieu of the internally stowed torpedoes. They were also armed with a 3-inch (76 mm) deck gun.[4]
HMS Spark was built by Scotts, of Greenock and launched on 28 December 1943. Thus far she has been the only ship of the Royal Navy to bear the name Spark. She survived the Second World War, spending between December 1944 and July 1945 with the Eastern Fleet, arriving at Trincomalee on 21 October 1944. She went on to sink two Japanese sailing vessels, three Japanese coasters, a barge and a tug. Another coaster was forced ashore on Panjang Island. Spark was attacked by an enemy escort which dropped sixteen depth charges, but managed to escape damage. She returned to the UK in October 1945.[5] She was sold on 28 October 1949. Spark was broken up at Faslane in October 1950.
Spark acted as tow for the midget submarine XE-1, which was assigned to attack the Japanese heavy cruiser in Singapore Harbour as part of Operation Struggle.[5]