Izyaslav-class destroyer
The Izyaslav class were a class of destroyer flotilla leaders built for the Baltic Fleet of the Imperial Russian Navy during World War I.
Design and description
The Izyaslav-class ships were designed to serve as flotilla leaders for the -type destroyers. The ships normally displaced and at full load. They measured long overall with a beam of, and a draft of. The Izyslavs were propelled by two Brown-Boveri-Parsons Marine [Steam Turbine Company|Parsons] steam turbines, each driving one propeller using steam from five Normand-Vulcan boilers. The turbines were designed to produce a total of for an intended maximum speed of. During the ships' sea trials, they only reached despite outputs of. The ships carried enough fuel oil to give them an estimated range of at. Their crew numbered 150.The Izyaslav-class ships were originally intended to have an armament of two 60-caliber caliber Pattern 1911|102 mm (4 in) Pattern 1911 Obukhov guns], one each at the bow and stern, and a dozen torpedo tubes in six double mounts. The Naval General Staff changed this to four triple mounts once they became available in 1914 and then decided to remove a torpedo mount in exchange for another four-inch gun at the stern on 20 August 1915 while the ships were still under construction. Another gun was ordered to be added on the forecastle on 25 May 1916. was complete with this gun armament, but her sister ships had another gun added on the stern in April 1917. All of these guns were on the centerline and interfered with each other's movements. Anti-aircraft defense was provided by a Pattern 1916 anti-aircraft (AA) gun and a Lender AA gun, both in single mounts amidships. The Izyaslavs were completed with one triple torpedo mount between the forward funnels and two mounts aft of the rear funnel. They could carry 80 M1912 naval mines. They were also fitted with a Barr and Stroud rangefinder and two searchlights.
Ships
These ships were built by Bocker and Lange in Reval, Estonia. The ships were delayed due to ordering machinery from Switzerland which was embargoed on the outbreak of World War I. New machinery was ordered from United [Kingdom of Great Britain and Ireland|Britain].| Ship | Name in Soviet or foreign services | Laid down | Launched | Completed | Fate |
| Avtroil | Estonian Lennuk Peruvian Almirante Guise | 9 November 1913 | 13 January 1915 | 12 August 1917 | Captured by the British in 1918, given to the Estonian Navy and sold by the Estonians to Peru in 1933, scrapped, 1954 |
| Izyaslav | 27 October 1913 | 9 November 1914 | 16 June 1917 | Sunk, 8 August 1941 | |
| Prymyslav | 27 October 1913 | 27 June 1915 | 20 July 1927 | Sunk, 28 August 1941 | |
| Bryachislav | NA | 1 October 1915 | NA | Evacuated to Petrograd, but scrapped incomplete, 1923 | |
| Fedor Stratilat | NA | 1915 | NA | Evacuated to Petrograd, but scrapped incomplete, 1923 |