LEVEL BUOYANCY – FINN – Commercial Rated NSCV Compliant Safety

Vic and Qld checking for incorrect information on boat build plates

Vic and Qld checking for incorrect information on boat build plates


Level Flotation – this means that it will stay upright even if full of water, and will support its own weight PLUS the motors and occupants.

Buoyancy should be distributed in such a way as to allow the boat to float level if swamped [ end to end & side to side ] – and it also should be placed as high as possible to provide ‘swamped stability’..

A guide is to get-

50% of the buoyancy in the aft 30% of the hull, [to float motor]

25% should be in the passenger carrying area, and as high as possible, such as under the gunwales and the remaining [ to provide swamped stability]

25% should be placed in the front of the passenger carrying area.  [ to keep a level trim ]

foam placement is most important for level flotation

foam placement is most important for level flotation

There are two standards of Level Flotation –

– NSCV – National Standards for Commercial Vessels

– as 1799.1 – Australian Standards

The NSCV Standard is a higher standard – required for Rescue dinghies , Man overboard rescue craft and non solas Rescue Craft

Many boaters are concerned that additional buoyancy may reduce storage space and more importantly useable cockpit space within the boat however an adequate amount can be added without this occurring.
* Polystyrene Foam is not suitable [and NOT used in FINN Boats ].  This is [generally]white in colour and similar to packaging material.  This foam can soak up water and, most importantly, it is not impervious to petro-chemicals, which includes petrol and some glues.  If you ever have a fuel leak near this type of buoyancy, the foam will melt. In the event of a swamping or capsize, fuel can spill with pressure from tank vents and melt the polystyrene making a dangerous cocktail on the water surface which could then catastrophically  burn – eyes- throat – lungs.

*If the entire vessel buoyancy is under the floor and the vessel becomes swamped, it will capsize and end up in a dangerous upside-down position.