Think of a closed library at night
How quiet is quiet? While silent cruising is the most immediate advantage of an electric boat in terms of onboard comfort, Royal Huisman has been building extremely quiet yachts based on conventional diesel engine and generator technology for decades. Sound-proofing measures such as “floating” floors mounted on rubber bushes, are now common practice in the yacht building industry. But the shipyard’s inhouse R&D team is committed to minimizing sound and vibration at its source and has studied how relevant measures affect the construction process.
The result: incredibly low noise levels when the generator(s) and household services, including air-conditioning, are in operation. Think of a closed library at night to have a sense of what 30dB represents. The R&D team is always focused on noise and vibrations and on removing noise at its source, rather than just adding more insulation.
Under power, the experience is very similar. Guy Booth, owner’s representative of Project 403 (PHI): “At 22 knots you can barely hear the engines anywhere inside. You wouldn’t know you were moving unless you looked out of the window.”