Largest American Built Superyacht to Launch in 2011. Trinity Yachts is pleased to announce that its largest custom superyacht to date—and the largest American built yacht in 2011—the 242’ (73.8m) six-deck, full displacement steel hull, New Horizon, launched in mid November 2011. The epitome of the design, naval architecture and engineering that Trinity Yachts incorporates in each meticulously custom superyacht built, New Horizon caps a remarkable year for the U.S. builder. Trinity remains the top U.S.