HMS C35 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century.

Design and description

The C-class boats of the 1907–08 and subsequent Naval Programmes were modified to improve their speed, both above and below the surface. The submarine had a length of 142 ft overall, a beam of 13 ft and a mean draft of 11 ft. They displaced 290 LT on the surface and 320 LT submerged. The C-class submarines had a crew of two officers and fourteen ratings. For surface running, the boats were powered by a single 12-cylinder 600 bhp Vickers petrol engine that drove one propeller shaft. When submerged the propeller was driven by a 300 hp electric motor. They could reach 13 kn on the surface and 8 kn underwater. On the surface, the C class had a range of 910 nmi at 12 kn. The boats were armed with two 18-inch (45 cm) torpedo tubes in the bow. They could carry a pair of reload torpedoes, but generally did not as they would have to remove an equal weight of fuel in compensation.

Construction and career

HMS C35 was built by Vickers, Barrow. She was laid down on 3 March 1909, launched 2 November 1909 and commissioned on 1 February 1910. HMS C35 was part of the British submarine operations in the Baltic from 1915 to 1918. She was scuttled at Helsingfors (now Helsinki) 1.5 mi off Harmaja on 5 April 1918 to avoid seizure by advancing German forces. She was salvaged in August 1953 for breaking up in Finland.