Survey Projects


m/y Shadow - Inclining experiment & stability assessment

As AMSA accredited surveyors JBD has been engaged in many survey projects this year, ranging from old wooden vessels to modern composite super yachts and metal barges. Don’t hesitate to get intouch if you need any survey work carried out.

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AMSA Surveyors

JBD staff are AMSA accredited Marine Surveyors, and can see your vessel into Survey from Plan Approval to Periodic Surveys.

Completed Survey Projects

Commercial Survey of Dorothy T and Benno

John Butler Design was engaged to develop the documents required for the Dorothy T and Benno to be entered into commercial survey for harbour and river cruises.

The Dorothy T is a timber vessel which was first built in 1948 by the Norman Wright Family. Due to the vessels age, the existing drawings were not up to date and did not have the required detail necessary for the vessel to undergo the initial survey process. It was also necessary to document the modifications that had been made during the restoration process.

Accurate drawings of the vessels general, structural, steering and machinery arrangements of the vessel were required to be submitted to AMSA. All elements of the vessel; structure, shafts, bearings, cabin spaces, etc. were measured and drawn in AutoCAD.

Due to the re-planking and fibre glass coating of the hull it was necessary to undertake a lines lift on the vessel. This information was used to develop a stability model that could be used to produce a trim and stability booklet outlining the vessels adherence to the relevant stability criteria of the NSCV code.

An inclining experiment was undertaken on Dorothy T once all works were complete. The test was performed at Noakes Boat Yard and the results were used to produce the stability booklet.

The same process was undertaken for Benno. However, due to its operating requirements a full stability booklet was not produced. Instead the vessel was subject to a stability proof test.

Seatamer 7m Inclining

An Inclining experiment on Seatamer Marine’s ‘Chamaeleon’ was conducted by JBD and witnessed by RMS. A stability assessment was also prepared to determine the safe capacity of the vessel for 2C operation in accordance with the NSCV Code. Four loading conditions were considered including passenger departure/arrival conditions and diver departure/arrival conditions.

This vessel is capable of carrying 8 passengers plus 2 crew or 8 divers plus 2 crew.

Tournament 25′ Inclining Experiment

A Stability proof test was conducted on ‘Tournament 25’ at Mooney Mooney for Wallrock Marine. The vessel had been imported into Australia, and was required to be used for commercial operations. The simplified stability criteria was applied to meet the criteria of the NSCV code. The vessel was satisfactory for Class 2C carrying 4 passengers and 1 crew.


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