Start your engines. Another milestone in the construction of our Navy’s new sustainment vessel, Aotearoa, occurred recently when her two Bergen 9-cylinder, B33:45 model Main Diesel Engines were started for the first time and churned up the waters of Ulsan Harbour. The engines are 9 cylinder, each cylinder 330mm bore and 450mm stroke (hence 33:45 designation) outputting 600kW per cylinder, 5.4mW total output per engine.