* Steve Clark gives an expert view on BOR90's America's Cup wingmast
Steve Clark is widely acknowledged as one of the most astute and most experienced inshore multihull technologists and sailors on the planet. Sail-World asked Steve Clark for his analysis of the largest wing mast ever built.
Steve Clark:' The rig on BOR90 is a two element single slotted wing. This is a 'cleaner' configuration instead of a 'more powerful' configuration. You will not get the high lift coefficients without the #2 element ( the flap in the slot that directs the flow through the slot.) This is probably not a big deal because they have the ability to set head sails for down wind work.
'It may or may not have twist capabilities. For one thing, the use of head sails makes this less necessary. For another, the majority of the wind gradient is in the first 30' off the deck, so given the scale of this wing, it may not be as big a deal as it is for the smaller C Class wings.
'The control system seems to be the tried and true Patient Lady (the predecessor to Cogito) system, which is self tacking and very well worked out.
'The ability of the wing to operate at low angles of attack will be a big step forward for these boats which operate with so much apparent wind. I think it's going to help. If it blows hard enough for them to fly the main hull without the a jib being set, they will be faster upwind without the jib. This was true of Stars and Stripes 88 and should be true here given that this is a very clean wing. Stated another way, this rig will be able to sail longer without being backwinded by the jib. If that becomes a problem, the boat will be faster without the jib...
The entire interview by Richard Gladwell in Sail-World.com:
www.sail-world.com
...then have a look at the size of this crewman up in the rigging....WOW!