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    Acoustic materials

    Controlo de ruído a bordoMany a skipper and his crew have to endure levels of noise and vibration which be totally unacceptable elsewhere.
    However, a noise level of 65 to 70 dB is easily achieved, which is similar to the noise from an idling car engine.
    Noise can be broken down basically into structure borne sounds or air transmission sounds oir air transmission sounds.
    Air transmission sounds come mainly from the engine and the noise levels are directly related to the engine speed.
    This type of noise is effectively reduced by the application of Vetus sound deadening plates on the surfaces of the engine compartment.
    Pay particular attention to making the plates fit tightly, without any gaps for the noise to escape through.
    Different types and thicknesses of plate are available to suit different application and engines sizes.
    Structure borne noise generally comes from engine vibration transmitted to the boat via the engine beds.
    Effective counter measures against such noise include, installing flexible engine mounts, lining the engine up correctly with the propeller shaft and the installation of a good flexible coupling.
    Cavitation transmitted from the propeller may also cause appreciable reverberation in the underside of the hull.
    This type of structure borne noise is significantly improved by the application of VETUS anti-reverberation material, type ARM.
    This material comes in both sheet and compound form and is applied inside the hull above the propeller location.

    Insulation detail of a boat hull and deckhead
    Practical tests demonstrate that this material can help to reduce bow thruster noise. A coat of ARM compound, or a layer

    of sheet material around the tunnel can reduce the sound level by about 3 dB(A). Two layers can create a reduction of up
    to 7 dB(A).

    A : VETUS sound-deadening plate type SDP
    1 : perforated vinyl top layer,
    2 : polyurethane foam layer, 21,5 mm thickness
    3 : anti-reverberation slab, 4 mm thickness
    4 : polyurethane foam layer, 10 mm thickness
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