Friday, July 11, 2014

Resting on its design waterline

If my wife were sitting in the forward seat, the boat waterline would be about exactly where I painted it.  Calculating displacement takes place very early in the design process.  This hull has a 12-degree deadrise at the stern.  If I increased the deadrise, then something else would also have to change; either increase displacement (weight), shorten the waterline length, or risk the hull riding with the major chine exposed which would decrease stability and may cause the hull to be louder at speed from water slapping against the hull bottom.

Increased deadrise will make the hull ride better in waves and may increase directional tracking, but it also could require more power to maintain planing speed.  Everything is a trade-off.

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