A motor yacht, of whatever construction, provides a unique set of challenges for a marine surveyor. There is only a single means of propulsion, its engines, and therefore they are of the highest priority. Unlike a sailing yacht, a complete loss of power can lead to the loss of an otherwise completely seaworthy vessel. A pair of large marine diesels can represent a significant percentage of a vessels value. The cost of a complete rebuild can be damaging to the realisable value and can only be carried out by removal of the engines. On some vessels where the engines were installed before the deck was assembled, removal can require major surgery to the superstructure.
Diesel engines of all kinds only run at full efficiency when they are at their designed working temperature and delivering close to, or at their maximum load. This is often impossible when vessels with fast planing hulls are kept in speed restricted waters such as The Broads or Canals. A comprehensive survey for a motor yacht will often involve an extensive sea trial.
Click below for a sample survey of a Motor Yacht including a full sea trial