<<I am quite impressed the sail lashings seem to work. How do you keep the sail to lee of the mast?>>

  That's just what they want to do if they're on lashings or parrels (hoops).  See the attached photo of a gaff-rigged unstayed sail doing the same thing, though less pronounced because of the smaller sail and smaller mast diameter.

  With the full-sized boat, the effect should be somewhere between:  a) the smooth leeward edge of perfectly-adjusted rotating wing mast, and  b) the turbulence created with track on a fixed mast when the sail's luff is several inches to windward of where a smooth edge would be. 

  It might even surpass a rotating wing mast over the course of a day if you don't have someone to keep an eye on tuning the rotation -- a good average is better than periods of optimization followed by long spans of non-optimization.

        - Mike

 

I am quite impressed the sail lashings seem to work. How do you keep the sail to lee of the mast? 

"Steinar is working on some graphics to make it look lower."

and please add fore - aft asymmetry in the graphics as in the original BL drawing - the lack of it as in all other designs freaks out non-proa sailors (and their significant others who before they buy a boat need to know which direction to sit in the boat when having tea - once bought and on board and the kettle is on the skipper can explain that the boat sometimes goes in reverse to protect the tea party from the wind) 

 

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