french ironclad wooden armored frigate class built french_navy mid late 1860s ship running sea trials july began immediately placed reserve war participated french occupation tunisia flagship port visits britain russia sold scrap design description class ironclads designed improved version class ironclads ships central battery ironclads armament concentrated amidships time french ironclad watertight iron bulkheads fitted hull like ironclads era equipped metal reinforced ram ship measured meters overall beam meters maximum draft meters displaced metric tons long tons crew numbered officers men metacentric height ship low feet propulsion class ships horizontal return connecting rod compound steam engine driving single propeller engines powered oval boilers sea trials engine produced indicated horsepower reached knots mph carried metric tons long tons coal allowed steam approximately nautical miles speed knots mph class ships barque rigged masts sail area square meters armament ships main armament mounted barbettes upper deck gun corner battery remaining guns battery deck barbettes armament upgraded commissioned millimeter guns barbettes battery deck millimeter seven millimeter guns millimeter guns added millimeter guns replaced millimeter guns caliber millimeter gun fired armor piercing pound shell gun weighed long tons gun fired shell muzzle velocity credited ability penetrate nominal inches wrought iron armour muzzle armor piercing shell caliber gun weighed pounds gun weighed long tons muzzle velocity credited ability penetrate nominal inches wrought iron armour muzzle millimeter gun long weighed long tons fired pound explosive shell muzzle velocity guns fire solid shot explosive shells point ship received dozen millimeter hotchkiss barrel revolving guns fired shell weighing muzzle velocity range meters rate fire rounds minute hull enable guns battery deck fire forward aft guns mounted barbettes sides hull ability fire fore aft late ship career water millimeter torpedo tubes added armor ocean class ships complete millimeter wrought iron waterline belt sides battery armored millimeters wrought iron barbette armor millimeters thick portions sides protected millimeter iron plates says barbette armor later removed improve stability confirmed source service laid brest july launched october ship began sea trials july running franco prussian war began immediately reserve commissioned service remained squadron placed reserve october ship recommissioned assigned transferred french division levant february bombarded port july french occupation tunisia remained mediterranean assigned flagship led squadron port visits august september reduced reserve following year sold march
French ironclad Marengo