Chris P. - this is the book I was telling you about. Its called "Building Outrigger Sailing Canoes" - not sure if this is the same thing as a Proa, but they talk about Proa's in here. It seemed to me they were the same thing. If you search on that name there are also other links to the book, but most seem to want to sell it, while its available for free download. It is long - 185 pages.
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What happens in a black hole stays in a black hole.