class monitor class pair monitors built imperial_russian_navy late 1860s designed british built saint_petersburg ships assigned fairly uneventful careers assigned training units struck rock run aground sink reclassified coast defense ironclads sank storm year loss hands sister ship continued service eventually scrapped wreck discovered expedition sponsored design description late begun planning second generation ironclads succeed ships construction issued requirement november twin screw low ship sail baltic_sea armed inch guns protected armor deciding designs accept admiralty decided order ships types march allocated ships submitted different designs competition june ships simplest design awarded new builder provided facilities state owned addition admiralty committed armament armor engines boilers variety smaller components ships class monitors significantly larger predecessor feet long waterline beam feet maximum draft feet inches ships designed displace long tons turned overweight actually displaced long tons fitted shaped ram projected feet forward bow fitted double hulls subdivided watertight bulkheads compartments crew numbered officers crewmen ships feet decks sort moderate sea rolled heavily responding ship wheel degrees rudder applied monitors fitted iron pole masts probably fore aft rigged steady ship propulsion propulsion class simple horizontal direct acting steam engines built engines bore inches stroke inches drove single bladed inch propeller steam provided rectangular boilers pressure kpa psi engines designed produce total indicated horsepower produced ihp gave ships speeds knots mph ran sea trials monitors boiler small steam engine powered ventilation fans pumps class carried maximum long tons range unknown armament monitors designed armed inch rifled guns pair type turret ventilation prevented turrets firing directly forward aft turret bear approximately difficulties manufacturing guns delayed construction monitors forced admiralty change armament pair inch guns forward turret pair inch muzzle loading guns aft turret guns replaced pair inch rifled guns beginning replaced turn longer powerful inch guns ship carried rounds gun light guns use torpedo boats known fitted aboard class ships 1870s variety guns added numbers locations partially known received pounder inch guns mounted roofs gun turret total guns gun aft turret guns known fitted included millimeter quick firing guns millimeter guns millimeter hotchkiss revolving cannon inch guns armor class monitors complete waterline belt wrought iron inches thick amidships inches aft inches forward feet inches high completely covered hull feet inches waterline armor backed inches teak turrets inches armor backed teak conning tower inches thick amidships deck inch thick inches ends ship ships construction service monitors intended delivered construction held delays delivery armor changes construction death august contract transferred mitchell completed years scheduled delivery date cost ships spent entire careers june ripped foot long hole hull struck rock deliberately run aground prevent sinking assigned march later assigned training detachment monitors reclassified coast defense ironclads february sank storm september voyage loss entire crew officers enlisted men despite extensive search traces found body debris washed ashore remained service march turned port disposal ship stricken navy list april finally scrapped wreck discovered july kilometers nmi south joint expedition commercial diving company wreck generally intact fishing nets aft turret fallen ship
Charodeika-class monitor