I am having fun at the moment contemplating building a tiny catamaran or trimaran for singlehanded coastal cruising in Queensland.  Although it is by no means a definitive short list, rather just an early appraisal, the two boats I am looking at are quite different, the Bernt Kohler Eco 7 cat and the Marples Seaclipper 28 tri.  Considering junk rigs, I envisage the Eco 7.5 with two bilateral masts (one in each hull), at the position marked 8 on the drawing, with Arne-style cambered sails.  The total sail area of the standard sloop rig is about 24 sq metres , and I find myself wondering how much sail area each junk sail should have.  Any ideas?  The Marples tri would be much cheaper and simpler to build, though the accommodation would be strictly for one, unless I added little wing decks.  The single junk mast would be placed just forward of the forward beam, and again would use an Arne style cambered sail.  I'd have to get rid of the centreboard and maybe put daggerboards in the amas (outer hulls), which has the advantage of providing significant lift.    When I emailed the designer, John Marples, I included a photo of Arion under sail, just for fun, and he was very supportive of putting a junk rig in.  He also sent me a huge amount of free info and drawings.  Kohler's $20 study plans were poor value by comparison.

You can click on the images to look at larger copies of the images in my photo albums..