Omission by ignorance of what will work is more precise. '-)  The ww hull foil is so it will foil tack and gybe, as per the Volvo requirements.  At this stage, I will be happy just to get it foiling.   If it does, we will think about foiling tacks and gybes and what is required to keep the ww hull up.  Current options are a T foil with wand that rotates to follow the water flow or a pair of angled foils, one for upwind, one for down.  Any other suggestions, let me know.  Not just for the foiling tacks and gybes, but for the boat generally.

Incidentally, voting closes tomorrow,   looks like it is pretty close.  https://www.facebook.com/foilingweek  Scroll down to "Stirring the pot"