french ironclad french ironclad crown iron ironclad warship built french_navy ship laid british armoured frigate hms warrior completed ship participated franco prussian war saw combat served gunnery training ship following year barracks ship toulon scrapped years completed design description designed french naval architect iron version class ironclads intended fight line battle unlike british ironclads ship classified armoured frigates single gun deck traditional disposition guns length hull meant broadside ironclad ship metres long beam metres maximum draft metres depth hold metres displaced tonnes long tons ship metacentric height metres meant rolled better sea boat gun ports slightly higher waterline predecessors metres took aboard water crew officers enlisted men ship single horizontal return connecting rod compound steam engine drove bladed meter propeller steam provided oval boilers designed speed knots mph figures engine designed power vary wildly indicated horsepower reached knots mph metric horsepower sea trials carried maximum tonnes long tons coal allowed steam nautical miles speed knots mph details sailing rig precisely known presumably fitted light rig masts like class ships unknown multiple changes rigging ships armed modèle millimetre rifled breech loading guns positioned single gun deck broadside remaining guns placed upper deck chase guns fired kilogram shell muzzle velocity metres second proved ineffective armour ship rearmed multiple times career replacement chase guns millimetre replacement rest guns improved modèle guns ship subsequently rearmed modèle millimetre guns main deck millimetre guns upper deck chase guns final armament configuration gunnery training ship millimetre modèle guns millimetre guns main deck pair millimetre guns dozen millimetre hotchkiss revolving cannon mounted upper deck wrought iron hull completely protected armour plates millimetres thick armour backing consisted layers teak totaling millimetres thickness iron work millimetres thick millimetre hull ship conning tower armour millimetres thick millimetres armour underneath wooden upper deck construction service ordered march laid arsenal february launched april commissioned february cost june played incidental role escorted confederate commerce french territorial waters fight assigned mediterranean_fleet ship port visit august brest fleet hosted days later french fleet visit portsmouth hosted channel_fleet franco prussian war ship assigned vice admiral squadron blockaded german ports august september german ironclads wilhelmshaven sortied search french squadron early august french arrived mid september french forced abandon blockade lack coal returned toulon december assigned reconstructed serve gunnery training ship replacing armour replaced wood thickness boilers removed propeller replaced rigging replaced ship rig iron deck decks fitted gave appearance steam ship line type ship rearmed assortment guns training purposes crew numbered officers enlisted men replaced gunnery training ship december disarmed september subsequently converted floating barracks toulon scrapped
French ironclad Couronne