Interesting shot of what I believe to be circa 1983 Diamond Head. Australian superstar, Tom Luedecke KA-1 sailing for Tiga on a 1984 Neil Pryde Fully Battened being the latest sail at that time designed by Monty Spindler. To leeward is Eric Thieme another member of the Tiga team. How things have changed: Notice the high booms and much higher off the deck rigs since masts were mounted much farther forward and the sails were higher aspect and the draft was located differently as well. The sail being used by Tom was designed by Mike Waltze, Matt Schweitzer and Spindler who worked together developing the Neil Pryde wavesail design "Ultranova". That was claimed by some as the "first serious all-full-batten wave design". However both Simmer Style and Ezzy Sails (?) were producing fully battened sails around the same time as I recall.