After coming across the beam bending equations in the last blog that describe the rocker profile you would get by fixing a flat surface at the middle edges and bending the ends up I wondered how close the profile would be to the continuous rocker that I had aimed at.
The chart below shows the differences:
As you can see the bend beam is slightly flatter but the difference in the height of the rocker is about 3 mm throughout the section from about 38 cm to 51cm which is around where, at the front of the board, the board will sit above the water.
This represents about 7.5% of the total rocker and when you draw a line horizontally through , say, the 2 cm height line it will result in about 4cm of board in the water when trying to go upwind.
The question is whether this will make a material difference to the board (in particular the upwind performance) that can't be overcome with some additional concave, channels and most importantly riding technique. I don't know the answer to this. My guess is no but would be great to hear from anyone who has a better understanding.
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