Jerry,

  The Matin Bleu junk/wing rig works on rotating masts.  If your French is good (or their English is good), you might be able to get some information from them on how they adjust their camber and avoid friction on the mast.

  You could also join the JRA at www.junkrigassociation.org and go through their forums.  They have a wingsail forum there that has a lot of information.

        - Mike

 

I just bought ($40 on Kindle) Blondie Hassler’s book on junk rigs.  It was very interesting and in depth.  There was a lot of geometry type aspects to these rigs that the book addresses very well.  It was written about 20 years ago though, and I will be getting into the Junk Rig associations web site to see what new developments there are.  One thing I did think of while reading the book was there is a lot of opportunity for chafe of the various parts as they rotate against the mast.  I was wondering if anyone has researched using a rotating carbon mast with this type of rig.  You could have a fixed boom and the upper yard would stay mostly fixed in rotation (it still has to go up and down the mast so it can’t be totally fixed).  They also don’t mention in the book the cambering that is being built into the junk sails by people doing it today.  I’m just curious about this rig and am just beginning to research it.

Thanks,

Jerry Barth