Has been trialed for over a year.
Big top mainsail
These options use the same mast length as is currently used, with a new sail plan. There is more than one possibility here:
Blade sail
Shorten the boom and push out the top of the mainsail while retaining the same sail area. The idea is to improve the efficiency and appearance of the sail with the minimum of changes.
Untried
Big top sail
Add a bigger head to the existing sail shape while keeping the same foot length. This is intended to improve the appearance of the sail and gain some extra power from the additional sail area.
Tried out a few years ago but killed at the AGM for some reason.


The only real difference between these two is whether the sail area is increased or not
Sounds like I have hit a raw nerve here but read above the extract from the mossie website..... so building in kevlar etc is not making it as modern as possible? all I am asking is if the rules had been amended yet !!!!