Enterprise

Is a J class yacht, designed by Starling Burgess for Harold S Vanederbilt in 1930, to successfully defend the America's cup.  The hull was double skinned, and she had a duralimun mast 16'2" long and made with about 80,000-100,000 rivets.  One crew member's job was to keep the mast repaired.  The mast weighed 4,000lbs.  These boats were very expensive and carried huge crews