Newcastle Marine launches 5500 yacht The widely anticipated Newcastle Marine 5500 (55-meter) has been launched. The trans-oceanic motor yacht represents Newcastle Marine's largest yacht to date, stretching about 180-feet long. The new launch is a custom built yacht boasting amenities fitting the owner's whims and fantasies. The Murray & Associates penned design is expected to weigh in at just over 900 gross tonnes. They also were responsible for the Naval Architecture. The interior styling was fashioned by Claudette Bonville & Associates, Inc. The 55-meter yacht isn't just the largest for Newcastle Marine, she is one of the largest yachts launched in the US in over half a century.