Those polars disappeared from the original web site. but they are here on the wayback machine.
http://web.archive.org/web/20050101071744/http://www.west.net/~lpm/hobie/archives/v1-i3/feature3.htm

Tony Marchaj got the Tornado polars from a paper by Bradfield published in The Ancient Interface Symposium on Sailing, California, Vol 10 1971.
You may be able to get reprint from AIAA.
This was for the Classic Rig Tornado.