french ironclad wooden armored frigate built french_navy mid late 1860s lead ship class commissioned participate franco prussian war assigned unsuccessfully attempted blockade prussian ports baltic_sea ship later served northern discarded 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 original armament consisted millimeter guns barbettes battery deck millimeter millimeter guns upgraded millimeter guns barbettes millimeter guns battery deck commissioned caliber millimeter modèle 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 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 december commissioned july service franco prussian war assigned attempted blockade prussian ports baltic squadron ordered return september afterward assigned placed reserve recommissioned service lengthy refit assigned completed ship transferred reduced reserve assigned year later training ship naval condemned
French ironclad Océan