Taking Mary's Idea a bit further why not hang the sails from the shrouds, then we get two jibs that meet at the top and the mast does not get in the way.

I have noticed that alot of the boats currently trying to break the world speed record have biplane rigs and there is even an A frame type rig. See http://www.windjet.co.uk/water/competitors.php

Carl, thanks for the plug, should finish the build on my strange boat this weekend, and am hoping to get it in the water next month, (althought I've been saying that since xmas).

Gareth
www.fourhulls.com