Unstayed masts

Here in the San Francisco Bay Area we have Mr. Tom Wylie, who designs the wyliecat line of (unstayed mast) sailboats. His website is: http://www.wyliecat.com/ and I'm not trying to shill for his boats but he has designed some very impressive vessels and I've built running rigging for one of them (Bruce Schwab's Ocean Planet, and open 60 class sloop). His designs and/or his expertise would be a great place to start looking for information - the boats are out there and sailing well.