Petr Veliky
... that the steam engines and boilers of the Russian ironclad Petr Veliky were so defective that they had to be replaced five years after she entered service in 1876?
... that the <a href="./Marine_steam_engine" id="mwBXw" rel="mw:WikiLink" title="Marine steam engine">steam engines</a> and <a class="mw-redirect" href="./Boiler_(steam_generator)" id="mwBX0" rel="mw:WikiLink" title="Boiler (steam generator)">boilers</a> of the Russian <a href="./Ironclad_warship" id="mwBX4" rel="mw:WikiLink" title="Ironclad warship">ironclad</a> <b id="mwBX8"><a href="./Russian_ironclad_Petr_Veliky" id="mwBYA" rel="mw:WikiLink" title="Russian ironclad Petr Veliky"><i id="mwBYE">Petr Veliky</i></a></b> <i id="mwBYI">(pictured)</i> were so defective that they had to be replaced five years after she entered service in 1876?