"In view of that, it seems reasonable to cap both the mast length and luff length. I suggest we leave about 800 mm difference (slightly under 2'8") between them. Each designer can decide how much the increase of energy availability justifies increasing heeling moment and weigth within those 800mm."

Why?...There has been talk all through this process of possibly using a windsurfing rig...others want to use a land yacht rig, others want a conventional stayed rig...setting some arbitrary limits might close the door on a viable option. Set the sail size in Sq/meters and let the designer/builder work out what is best the way to utilize that sail area.

Regards,
Bob