REFINING FLOAT SHAPES

Computer graphics give us some wonderful tools for design optimisation.

We use hydrostatic calculations to determine the volume and buoyancy distribution characteristics of a new hull, but computer graphics are also able to provide us with very good visuals that assist a lot in the design process. 


The two images at right show a comparison of the 30' long float produced for the Airplay and RAW30 trimarans in red, with an earlier design (transparent grey).


The bow of the new hull is about the same as the earlier float shape at the foot of the stem, yet is significantly finer up at deck level. They also show that the red hull has more buoyancy than the benchmark float about 1m (3') back from the stem and this extra buoyancy carries right through to the transom.


Hydrostatic calculations were able to confirm that after the modifications we had retained the centre of buoyancy of the float in the same location and gained a couple of kilos of displacement in the overall volume.


In the blue image at right the float buttock lines show the fuller midships volume achieved without increasing the beam to length ration of the float.

 

 

Folding trimaran float shape-1



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