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    Positive Bouyancy


    From Marine and Safety Tasmania

    Positive Buoyancy

    The MAST Recreational Boating Safety Review, conducted in 2000, indicated that nearly 50% of all boating incidents involved vessels capsizing or being swamped. This obviously results in the occupants ending up in the water where there is a risk of hypothermia. In July 2006, the NMSC’s Australian Builders Plate (ABP) was introduced requiring manufacturers of new vessels to provide buoyancy in all their vessels under 6 metres. This ABP is also required to indicate whether the boat would have basic flotation or whether it would float level, known as positive buoyancy.

    But those people who are boating in older boats (those that were constructed prior to July 2006) do not necessarily know whether their boat will stay afloat in such an incident.

    The attached report highlights the reasons why buoyancy is so important, how to calculate the required buoyancy in a vessel and also provides detailed information on the types of buoyancy that can be used and how it can be easily fitted to existing boats.

    If you are unsure of retro fitting your own boat you should seek the services of a suitably qualified boat builder.



    I have tried and failed to attach this excellent article/report on how to both calculate and ensure your boat has sufficient foam buoyancy onboard. Keep in mind that 6 metres is approximately 20 foot and they are referring to a power boat with a heavy engine down aft.

    Enter: www.mast.tas.gov.au

    then click on: Recreational Boating

    then: General Safety

    then: Positive Buoyancy in Trailer Boats

    Alastair Russell12-Aug-2008    Edit    Delete 

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