Hi Simon
I thought I was going mad but I knew I had read this somewhere:
Other main rules
* Mid height width of gennaker is at minimum 75 % of length foot.
* Boat must be rightable by any crew either solo or doublehanded
* The rig may not be trimmed between start and finish by other means than sheet, downhaul, outhaul, traveller, mast rotation and halyards systems.
* Only "soft" sails are allowed.
* Using multiple sets of the top three battens to fine tune the rig to the crew (1-up/2-up) is permitted and does not require remeasurement of the sail
* No ballast other than corrector weights are allowed
* The wearing of bouyancy aids is compulsary during (open) Formula 16 races

Therefore it seems as if we have a contradiction in our rules? <img src="http://www.catsailor.com/forums/images/graemlins/confused.gif" alt="" />