Kiteboard deep concave with OPENSCAD mod files.

The final STL file is for DELTA printing, most other printers won't go high enough unless you make it really small. This is a 1/10 scale 1400mm x 400mm board.
I developed the surface with tweaks to my vase building program. The base cylinder is wider at the ends and deformed to sway left the closer it gets to the middle in height. As a consequence, the vertical surface slice I have chosen has a little less concave towards the ends (easier turning). Also, I've got two scales of sinewave playing out over the radius and height so that the ends have a small amount of progressive rocker.
Running the *.SCAD programs in sequence(instal openscad first) gives options to fine tune thickness, rocker, concave and outline. The handle would be a nice print in ninjaflex.
ourwaveA2.scad gives fine tuning of the outline by combining an ellipse inner guide shape with a radiused addition all around the outside of the ellipse. While a pointier true ellipse shape would probably give a smoother ride, the selected compromise gives a visually pleasing shape with a more compact, back of car shape. Rocker is gentle for upwind capability but is still there to make it more friendly riding waves downwind.
My next step is to do DXF slices and print them out in A1, or get them CNC cut to form my templates for the test build with strip-built wood under surface. Once they are glued to each other over the formers, I will finish one side with basalt, graphics and surface tissue before flipping and adding a bit of volume, handle, binding and fin screw fixings and overcoating with more composite fabrics. If you've got the CNC equipment to try this out then please bookmark this design and post your progress! Hopefully I'll have one ready to ride in about a month! Note that the rounded ends make this the equivalent of a slightly shorter square ended board.
"Kiteboard outlines.pdf" is for printing in a huge A0 sheet of paper. The bulkhead forms should be glued in line at 100mm spacings. The partial outline can be printed twice and rotated 180 degrees and overlapped or folded between the center handle holes to trace the other end.