Sunseeker Portofino 47 Survey by Guy Nicholls, Marine Surveyor Poole for Solent Marine Surveys. This Sunseeker was equipped with twin Volvo Penta D9 diesels, giving around 31 knots boat speed at 2300rpm during the sea trial which was conducted before the hoist for the full pre-purchase survey. I worked in parallel with Golden Arrow Marine who where able to access the engine history and run full diagnostics which on modern engines such as these requires a marine engineer to facilitate.