V Twin

That was my first thought - looks wide and probably quite heavy???

Originally posted by G.R.F.  and I should be happy at last and not moaning all the time.

This sort of reminds me of something I was reading a while back: "The Athenian trireme": the story of how a recreation of a 5th Century BC warship was made. The thing is they don't have that much data, so a lot of the design had to be done from scratch. And when it came to hull shape the dimensions - length to beam ratio and prismatic coefficient (how fat the ends are compared to the middle) - were so far from anything used today that all the available formulae, computer models and the like were essentially useless so they just had to take a guess and hope.

In the same way what you are up to here is so outside the normal range that its going to be very difficult to predict what it will do. How many variations do you reckon you'll be able to try? It would, after all, be extraordinary if something so radical could be right first time. Smart money is you'll need a couple of iterations. Its what I should have done with my rather less radical PlusPlus project: built another prototype or two, but the trouble was I'd kinda lost interest after a while... In an ideal world I'd have had a team of development sailors sailing it every day all summer I suppose.

Originally posted by rich96 Lots of interesting ideas.   1)Why two kites  & poles ?   2)How will you get any luff tension in an inflatable jib ?   3)How long is the hull ? - It looks a quite short ?   4) It also looks like it may 'squat'/stick a bit in light winds ?   Well done for actually building it though - good luck.