admiral class monitor admiral class pair monitors built imperial_russian_navy late 1860s sister ships assigned baltic fleet completion remained entire careers aside accidental collisions grounding careers uneventful reclassified coast defense ironclads training ships stricken navy list ship stationary target coal storage barge ultimate unknown design description late begun planning second generation ironclads succeed ships construction ordered ships fully rigged types coastal defense ships march british submitted different designs coastal defense vessels broadside ironclads turret ships decided august broadside designs based hull shape earlier class ironclad better armed fewer powerful guns numerous guns older ships variants worked differed hull draft november committee decided revise designs use gun turrets armed pair massive american designed inch guns armament changed inch rifled muzzle loading guns months later june admiral admiral ordered shallower draft version designs construction ships repeatedly delayed design changes delayed deliveries components significant design changes related armor protection shortly ordered realized specified inch armor latest rifled gun decided existing armor reinforced additional inch armor plate additional wooden backing inside existing armor additional weight offset increasing height hull inches deepened ships draft second change occurred new inch rifled guns able penetrate replica armor scheme june decided significantly armor ships removed gun turret compensate weight extra armor november numerous changes flowed decision engine boilers moved forward foot maintain ships trim transverse bulkheads moved major change added cost ships added delays russian problems rolling thicker armor plates admiral class monitors significantly larger predecessors class feet long waterline beam feet maximum draft feet ships designed displace long tons turned overweight actually displaced long tons fitted shaped ram double hulls subdivided main watertight bulkheads crew consisted officers crewmen propulsion admiral class single cylinder horizontal direct acting steam engine bore inches stroke inches drove single bladed inch propeller steam provided rectangular fire tube boilers pressure kpa psi engine designed produce total indicated horsepower gave ships speeds knots mph ran initial sea trials monitors boiler small steam engine powered ventilation fans pumps admiral class carried long tons coal gave range nautical miles speed knots fitted light fore aft sailing rig pole masts area square feet primary purpose steady ships assist turning armament monitors ultimately designed armed inch rifled guns pair type turret armored bulkhead separated guns inside turret guns replaced single inch gun turret based krupp design russo turkish war inch mortar fitted attack thin deck armor enemy ships accuracy poor later removed probably early 1880s improved powerful inch gun installed aboard admiral 1880s admiral retained original guns rest career light guns use torpedo boats added admiral class ships russo turkish war pair pounder inch guns mounted roofs gun turret guns known fitted included inch quick firing guns millimeter guns millimeter hotchkiss revolving cannon ships carry mines intended create secure anchorage armor hull admiral class monitors completely covered wrought iron armor upper feet inches high lower waterline feet inches high middle inches thick length feet amidships generally inches thick upper inches thick abreast turrets armor inches aft inches forward main belt layer armor backed inches teak reinforced angle came inch inner armor plates backed turn inches teak turrets inches armor gun ports inches reinforced inches teak conning tower inches thick deck armor layers total thickness inch separated layer cloth felt better hits expected upper layer inches thick lower inches ships construction service launching sisters transferred fitting shallow waters saint_petersburg prevented deep draft ships completed added delays dockyard lacked equipment efficiently fit ships ships assigned baltic fleet completion fully equipped trials continued admiral accidentally rammed monitor admiral harbor sister collided monitor years later ship seriously damaged days collision admiral struck speed damaged incident firmly stuck early attempts pull failed killed officer badly wounded monitor possible forward guns removed freed days running aground ships received electric installed late 1870s admiral served flagship captain 1st rank naval maneuvers approaches boilers replaced years later steam powered steering gear installed sisters reclassified coast defense ironclads february time role russian war plans defend anticipated german amphibious landing transferred training ships transferred port march disposal sisters stricken august admiral stationary coal storage barge admiral grounded near target subsequent unknown
Admiral Spiridov-class monitor