OCEAN 3 mooring buoys are typically made from a core of Polyethylene (PE) foam which will recover its shape after compression, 100% closed cell of various densities depending on usage. Such foam will guaranty no water absorption in case of damage. It allows a compression of up to 60% of its original volume for short periods of time, to regain its shape, meaning they allow for energy absorption, such as a fender.
The choice of the foam density relies on setting up the best parameters between weight and its ability to compress (as the higher the density the less the buoyancy will be).
A conical shape on the bottom part will allow it to be more stable in the water.
A calculation needs to be established as to working out the total force coming from the mooring line.
Calculation of the angle of the buoy with the mooring line.
Calculation of the moorings with multiple anchor points.
The buoy with the mooring line weight is represented above. The draft / free board will change depending on the weight of the mooring line.
Having worked out the centre of gravity, we are able to represent the stability of the buoy when in full charge or without any moorings. All those figures have been calculated in 3d views.
Stability simulation in full charge from 10° to 90° angle
Stability curves