12 july 2015 FOGHORN FOGHORNFOCUS environmental issues is another big step forward in the ongoing process notes Alison Nolan BHC Principal. Salacia a 600-passenger high-speed catamaran joined BHCs fleet nearly 15 years ago. Built in Somerset MAby PVA Associate member Gladding Hearn Shipbuilding Salacia set sail as a state-of-the-art high-speed catamaran used as a design resource in planning many of the Boston areas similar boats that followed. But as we all know time flies And much like it is with dog years boat years add up even quicker than human years do So even with the constant care of BHCs maintenance staff and several extensive aesthetic and mechanical upgrades throughout the years at age 15 Salacia was ready for the complete engine refit that was undertaken this past winter. But long before Salacia went into drydock for her working winter vacation BHC staffs work began with in-depth research to determine the right fit for Salacias specifications to uncover the latest technology and to identify the manufacturer that could best complete the engine-build. After much consideration BHC purchased four MTU 12V4000M64 engines from PVA Associate member Stewart Stevenson Power Products LLC. MTU a subsidiary of Rolls Royce Power Systems and a PVA Associate member is one of the worlds leading manufacturers of large diesel engines and complete pro- pulsion systems - usually used in powerful tug boats. Salacias new engines were manufactured by MTU and assembled in Friedrichshafen Germany where BHC staff visited to witness the engines first dyno test. Once completed the engines were successfully tested and put on a container ship headed for Boston. After her 2014 season Salacia headed to a three-month dry dock in January at the shipyard where she and BHCs entire fleet of high-speed catamarans was built. There crews first completed the removal of the four existing Caterpillar 3512B engines and two generators. Then the delicate installation process began for the four new engines weighing 19000 lbs. each plus two new PVA Associate member John Deere 4045 AFM85 Tier 3 generators amazingly with only two inches of wiggle room for the fit The retrofit of the four new MTU engines took three months and a close collaboration between BHCs Rick Nolan and MTUs Jeff Sherman.