Still i think that it is also crucial the change the weight of the board somehow. A lightwind planning board needs to be light to do so. Maybe use new materials to see what the real benefits can be, take the Apollo concept out of the box and see where you can come up with. The board should be up to a max of 6 kg, is that realistic? Again not by the currently used materials and building methods but out of the box. Can it be done?
Maybe again hollow
oeps better not have said that...... But you know what I'm trying to say. If only the F161 would have been build to only 6 kg max then it would certainly outperform the Appollo in the lightest winds also, yes?
Please give it all you have and give us a strong light planning board that is also very light to transport to the water.