french ironclad arc french ironclad arc wooden armored corvette built french_navy late 1860s named joan arc roman catholic saint heroine years war arc participated franco prussian war remained commission unlike sisters ship condemned known disposition design description alma class ironclads designed improved versions armored corvette suitable foreign deployments unlike predecessor alma class ships true central battery ironclads fitted armored transverse bulkheads like ironclads era equipped metal reinforced ram arc measured meters perpendiculars beam meters mean draft meters displaced metric tons long tons crew numbered officers men propulsion ship single horizontal return connecting rod steam engine driving single propeller engine powered oval boilers sea trials engine produced indicated horsepower ship reached knots mph unlike sisters funnels mounted arc carried metric tons long tons coal allowed ship steam nautical miles speed knots mph barque rigged sail area square meters armament arc mounted millimeter modèle breech loading guns central battery battery deck millimeter guns mounted barbettes upper deck sides ship millimeter guns mounted upper deck exchanged guns guns armor piercing shell caliber gun weighed pounds gun weighed long tons gun fired shell muzzle velocity credited ability penetrate nominal inches wrought iron armour muzzle guns fire solid shot explosive shells armor arc complete millimeter wrought iron waterline belt approximately meters high sides battery armored millimeters wrought iron ends battery closed bulkheads thickness barbette armor millimeters thick backed millimeters wood portions sides protected millimeter iron plates service arc laid launched september ship began sea trials march reserve brest commissioned april shortly franco prussian war began assigned july departed company rest cruised danish port july august entered baltic_sea squadron renamed remained baltic attempting blockade prussian ports baltic ordered return september august arc spain departed later day bound accidentally rammed sank dispatch vessel december flagship placed reserve january brest arc recommissioned april service condemned august known fate
French ironclad Jeanne d'Arc