Agreed. I wrote that before I saw the pictures of your rig
mentioned in a later post. Today I actually made the same
comparison to a modern high-tech fully-battened squaretop main.
Thanks for the clarification, and for the work on the junk rig.
It's great to see people pushing its performance envelope.
- Mike
JamesB wrote:
Mike and Doug,
My junk rig has an airfoil shape cut into the panels, with a draft of 1/3 the chord length. A junk rig with an airfoil shape is essentially the same as a big, modern square top mainsail. The only difference really is that the sail does get pushed around the mast on one tack....
But think about this. On the "favoured" tack with the mast to windward, the sail will set a great shape, but the mast will be exposed to the wind and creating drag. On the so called less favoured tack, the mast is hidden in the shadow of the sail, and creates very litle drag. So in actual fact, there is no noticable drop in performance due to the contact between the sail and mast. Sure it looks a little weird, but who really cares?
Also, the leading edge of a sail is very sensitive to turbulence, and a marconi rig with a mast right at the leading edge of the sail will hurt it's efficiency big time (unless the mast rotates), whereas a junk rig will not.
Regards,
James Brett