Home NR584 Propulsors in ice This Rule Note applies to podded propulsor, with or without nozzle and geared propulsor, with or without nozzle intended for navigation in ice-infested waters. Reference Title Date NR584 R00 Propulsors in ice Jul 2012 CHECK RELATED DOCUMENTS: NR527 Rules for the classification of ships operating in polar waters and icebreakers NR467 Rules for the classification of steel ships Check other Bureau Veritas rules and guidelines.