Thanks for the write-up Rudolph. The split junk rig is looking more and more promising, and thanks for outlining the developments you have made.
I saw a 90 degree shelf (on Zane's Pango, sail by Paul Thompson) and those panels, a little slow to inflate in light wind - once they filled, they looked powerful and the sail pulled very well. What weight of sail cloth did you use on your Oceaan 22?
Also, I had another look at the photos of your boat (on your opening post to this thread). It is interesting to see the 90 degree shelf forming perfectly on the mains - and compare with the jibs which, supported in an entirely different way, inflate in an entirely different way, giving quite a different final shape compared with the theoretical drawing. I think maybe the design of these bulging SJR jibs with their un-tensioned leech, calls for a different design paradigm than the mains, or the panels of a contiguous sail. It seems to be a bit of an art form to design jibs, and must have been a big leap of faith for Slieve when that first sail was built. And you have now moved a long way from the parameters of the original Poppy.
Well done. Whatever the theory - "the proof of the pudding is in the eating."
(While all this is going on, what's happening to your lovely De Skou with its lofty and powerful Johanna sail - superbly adapted to shallow water and canal sailing, she must be a real flyer too?)