41-meter "Serenity" Launches At IAG Yachts IAG Yachts have launched their first yacht of 2016 and she is a 41-meter luxury vessel named "Serenity". The design is uniform and relatively balanced but one of the stand out features onboard is the proliferation of balconies. Perhaps this is why the model is known as the Terrazza edition. Diesel-electric engines are onboard that allows her to run at a top speed of 18-knots. If she is dialed back to a continuous 12-knots, Serenity can trod for 3,000 nautical miles.