Bruce46

Although not a design by B&B you might want to look at http://www.dropsheet.com/diablo/html/

I’m confused, for years I have believed that the distance the Center of the sail area is ahead of the Center of Lateral Plane is the positive lead, (giving weather helm). However, I was just reading a book that states that the Center of Effort should be behind of the Center of lateral Plane. Should the rudder area be included in the lateral Plane? What amount of lead is accepted for Sloops, Yawls, Ketches, cat ketches?

I was thinking of something like, http://www.americanflagstore.com/alflagpoles/25ftaluminum.htm or http://www.excelsails.com/specialbudgetflagpoles.htm

I was poking arrond the net and came across 6063 al. flag poles, would they be suitable for a CS 20? They are tapered full length. I believe that 6063 isn't quite as strong as 6061 so what would be the correct size.

Par thanks for your reply. I know that the angle of the boom can alleviate the need for a boom vang, how is that determined? I would imagine that there is no perfect angle for all boats, and experimentation would be necessary for the perfect set up for a specific boat.

Seeing the work some designers have done with unstayed masts and wishbone/spirt rigs has stirred my interest. However, I am finding it difficult to find information about what is the proper relationship (angle) between the mast and the wishbone boom. Equally elusive is how the running rigging is laid out. Is there a book or technical paper that would provide answers? One person suggested going around to marinas and looking at boats, however, I not very good at climbing over gates or running from rent-a-cops. Thanks for any guidance. Bruce